WO2006037591A2 - Verfahren zur herstellung von nanopartikeln mit massgeschneiderter oberflächenchemie und entsprechenden kolloiden - Google Patents
Verfahren zur herstellung von nanopartikeln mit massgeschneiderter oberflächenchemie und entsprechenden kolloiden Download PDFInfo
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- WO2006037591A2 WO2006037591A2 PCT/EP2005/010643 EP2005010643W WO2006037591A2 WO 2006037591 A2 WO2006037591 A2 WO 2006037591A2 EP 2005010643 W EP2005010643 W EP 2005010643W WO 2006037591 A2 WO2006037591 A2 WO 2006037591A2
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- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
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- JSPLKZUTYZBBKA-UHFFFAOYSA-N trioxidane Chemical compound OOO JSPLKZUTYZBBKA-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
- B82B3/00—Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G1/00—Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, or C01F, in general
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G1/00—Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, or C01F, in general
- C01G1/02—Oxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G25/00—Compounds of zirconium
- C01G25/02—Oxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62625—Wet mixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62625—Wet mixtures
- C04B35/6263—Wet mixtures characterised by their solids loadings, i.e. the percentage of solids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62655—Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
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- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/441—Alkoxides, e.g. methoxide, tert-butoxide
Definitions
- the present invention relates to a process for the preparation of colloids of crystalline and / or compacted, surface-modified, nanoscale particles in a dispersant and of powders of these crystalline and / or compacted, surface-modified, nanoscale particles.
- EP-A-0229657 and US-A-4784794 describe the preparation of highly dispersed, monoclinic ZrO 2 sols by hydrothermal reaction of aqueous, zirconium-containing precursors obtained by the reaction of zirconyl chloride with water or by dissolution of zirconium salts in hydrochloric acid to be obtained.
- rod-shaped or ellipsoidal ZrO 2 particles having a diameter of less than 10 nm are obtained.
- a disadvantage of this method is the very long duration of the hydrothermal reaction of more than 24 h, with a dilution to less than 1 mol / liter, a pH adjustment, which can be done by dialysis, ion exchange, ultrafiltration or addition of bases, and a subsequent Auf ⁇ concentration are required.
- This process is also limited to the production of ZrO 2 sols stabilized in aqueous HCl. Surface modification and doping are not described. Also, a mechanically activated surface modification under high shear is not provided.
- US-A-5643497 discloses the preparation of stable aqueous zirconia sols having low surface activity for use as abrasives for the semiconductor industry. Production described.
- zirconium oxide powder is calcined, which was obtained from a sol having a particle size between 20 and 500 nm, and then dispersed again in water in the presence of water-soluble acids or bases.
- Stable ZrO 2 colloids with a particle size of 20 to 1500 nm are obtained.
- the disadvantage is that the pulverization in a mill lasts between 20 and 100 h and is therefore uneconomical. For example, a grinding time of 96 h is required to obtain a particle size of 152 nm.
- Zirconia sols with particle sizes below 20 nm can not be prepared by this process.
- US-A-5935275 and EP-A-0823885 describe the synthesis of weakly agglomerated nanoscale particles through the use of surfactants.
- the purpose of the surface-blocking substance is to control the particle size and to form a steric barrier against agglomeration.
- the surface-blocking substance may be removed from the surface of the particles and replaced with another surface-modifying substance. The removal of a surface-blocking substance is very expensive. According to this method, nanoscale particles in the range of 1 to 100 nm should be producible. A mechanically activated surface modification is not described.
- US-A-5234870 describes processes for the preparation of transparent zirconia sols which are stable in the aqueous neutral and basic range as well as in organic solvents.
- sols produced by hydrolysis at elevated temperature from zirconyl ammonium carbonate in the presence of a chelating agent are amorphous and thus can not be used in many areas.
- a mechanically activated surface modification under high shear is also not provided here.
- the powder is boiled in 8 N NaOH and toluene for 5 h, the residue obtained is subsequently washed several times with deionized water. Subsequent modification is by stirring with TODS. A mechanically activated surface modification under high shear is not provided.
- ZrO2 sols are obtained by hydrothermal hydrolysis. In general, the hydrothermal reaction is carried out above 175 ° C for 16 to 24 h.
- the ZrO 2 particles are surface-modified with the corresponding polyether carboxylic acids, ie the acid liberated in the reaction serves as a surface-modifying component. Disadvantage of this method is that only a portion of the liberated polyether carboxylic acid is necessary for the surface modification of the particles. The excess part must be removed consuming.
- the polyethercarboxylic acids can also be replaced by other surface-modifying acids exchanged, but their use also requires a complex workup. A doping of the particles or a mechanically activated heatn ⁇ modification under strong shear are not described.
- the object of the present invention is to be able to produce surface-modified, crystalline and / or compacted, doped and undoped nanoparticles, in particular ZrO 2 nanoparticles, or colloids thereof having an average particle size of not more than 20 nm, which are the various disadvantages of the prior art no longer exhibit the technology, but can be produced in a simple and cost-effective manner with high yield and with a surface chemistry that can be adapted specifically to the other requirements of the application, without requiring surface blocking and / or stabilizing substances during the thermal process , which must be subsequently removed and / or replaced by additional steps.
- the method according to the invention should enable a broad spectrum of applications with regard to doping, dispersing medium and surface modification of the particles, in particular the ZrO 2 particles, or the colloids thereof.
- the present invention provides a process for producing a suspension of crystalline and / or compacted, surface-modified, nanoscale particles in a dispersant, the process comprising the following steps: a) a suspension of amorphous or partially crystalline, not surface-modified, nanoscale particles in a dispersant is heat treated to crystallize and / or compress the particles, and b) the suspension of the crystallized and / or compacted, not devis perennial ⁇ modified nanoscale particles in the dispersant of step a) or in another dispersant is activated in the presence of a modifier by mechanical stress, so that the particles are surface-modified by the modifier to form a suspension of crystalline and / or compacted, surface-modified, to obtain nanoscale particles.
- the suspensions obtained are preferably colloidal solutions or colloids or sols.
- a powder of the crystalline, surface-modified, nanoscale particles can be obtained from the resulting suspensions essentially without agglomeration or aggregation of the particles.
- colloids or powders having an average particle diameter of not more than 20 nm can be obtained.
- the nanoscale starting particles are subjected to a heat treatment in step a) for crystallization and / or densification, without the particles being or being surface-modified.
- agglomerated or aggregated particles can thereby be obtained, in step b), surprisingly, deagglomeration or deaggregation of the particles takes place so that particles having an average particle diameter of not more than 20 nm and even down to 1 nm can be obtained.
- step b) it is possible to start from not surface-modified particles, so that the surface modification can be tailored to the intended application. Elaborate removal of a surface modification present on the particles and subsequent functionalization with suitable groups are not required.
- this novel process avoids complex process steps, such as the removal of the surface modifiers required in the production / crystallization, and on the other hand, application-optimized powders or colloids can be produced by the mechano-chemical deagglomeration or deaggregation step.
- FIG. 1 shows an X-ray diffraction diagram of ZrO 2 particles which are used as starting material for the method according to the invention.
- FIG. 2 shows an X-ray diffraction diagram of the ZrO 2 particles of FIG. 1 after the heat treatment of the invention.
- step a) a suspension of amorphous or partially crystalline, non-surface-modified, nanoscale particles in a dispersant is subjected to a heat treatment, wherein no modifying agents are present which lead to a surface modification of the particles under the conditions used. Without a modifier, a heat treatment always leads to a more or less strong agglomeration / aggregation of the particles (van der Waals forces / particle growth).
- the particles used are solid particles or solid particles of any suitable material. It may preferably be inorganic particles.
- inorganic particles are particles of an element, an alloy or an element compound.
- the inorganic particles preferably consist of metals, alloys and in particular of metal compounds and compounds of semiconductor elements, such as Si or Ge, or boron.
- particles of one element are particles of carbon, such as carbon black or activated carbon, of a semiconductor, such as silicon (including technical grade Si, ferrosilicon and pure silicon) or germanium, or a metal, such as iron (including steel), chromium, Tin, copper, aluminum, titanium, gold and zinc.
- a semiconductor such as silicon (including technical grade Si, ferrosilicon and pure silicon) or germanium
- a metal such as iron (including steel), chromium, Tin, copper, aluminum, titanium, gold and zinc.
- particles of an alloy may be particles of bronze or brass.
- Examples of the preferred metal compounds and compounds of Halbleiter ⁇ elements or boron are oxides which are optionally hydrated, such as ZnO, CdO, SiO 2 , GeO 2 , TiO 2 , Al-coated rutile, ZrO 2 , CeO 2 , SnO 2 , Al 2 O 3 (in all modifi cations, especially as corundum, boehmite, AIO (OH), also as aluminum hydroxide), manganese oxides, In 2 O 3 , Y 2 O 3 , La 2 O 3 , iron oxides such as Fe 2 O 3 , Cu 2 O, Ta 2 O 5 , Nb 2 O 5 , V 2 O 5 , MoO 3 or WO 3 , BaO and CaO, corresponding mixed oxides, eg indium tin oxide (ITO), antimony tin oxide (ATO) fluoro-doped tin oxide (FTO), calcium tungstate and perovskite structure such as BaTiO 3 , Ba
- suitable particles are also magnetite, maghemite, spinels (eg MgO-Al 2 O 3 ), MuMt, eskolait, tialite, SiO 2 TiO 2 , or bioceramics, eg calcium phosphate and hydroxyapatite. It can be particles of glass or ceramic.
- These may be, for example, particles which are usually used for the production of glass (eg borosilicate glass, soda lime glass or silica glass), glass ceramic or ceramic (eg based on the oxides SiO 2 , BeO, Al 2 O 3 , ZrO 2 or MgO or the corresponding mixed oxides, electric and magnetic ceramics, such as titanates and ferrites, or non-oxide ceramics, such as silicon nitride, silicon carbide, boron nitride or boron carbide) can be used. It can also be particles that serve as fillers or pigments.
- glass eg borosilicate glass, soda lime glass or silica glass
- glass ceramic or ceramic eg based on the oxides SiO 2 , BeO, Al 2 O 3 , ZrO 2 or MgO or the corresponding mixed oxides, electric and magnetic ceramics, such as titanates and ferrites, or non-oxide ceramics, such as silicon nitride, silicon carbide, boron nit
- fillers based on SiO 2 such as quartz, cristobalite, tripolite, novaculite, kieselguhr, silica, pyrogenic silicic acids, precipitated silicas and silica gels, silicates, such as talc, pyrophyllite, kaolin, mica, muscovite, phlogopite, vermiculite, wollastonite and perlites, carbonates, such as calcites, dolomites, chalks and synthetic calcium carbonates, carbon black, sulphates, such as Barite andchtspat, iron mica, glasses, aluminum hydroxides, Alumi ⁇ niumoxide and titanium dioxide.
- SiO 2 such as quartz, cristobalite, tripolite, novaculite, kieselguhr, silica, pyrogenic silicic acids, precipitated silicas and silica gels
- silicates such as talc, pyrophyllite, kaolin, mica, muscovite
- oxide particles or hydrated oxide particles are oxide particles or hydrated oxide particles, in particular metal or semimetal oxides, hydrated metal or semimetal oxides or mixtures thereof.
- oxides or hydrated oxides at least one element selected from Mg, Ca, Sr, Ba, Al, Si, Sn, Pb, Bi, Ti, Zr, V, Mn, Nb, Ta, Cr, Mo, W, Fe, Co, Ru, Zn, Ce, Y, Sc, Eu, In and La or mixtures thereof.
- the preparation of the starting particles can be carried out in the usual way, e.g. by flame pyrolysis, plasma processes, gas-phase condensation processes, colloid techniques, precipitation processes, sol-gel processes, controlled nucleation and growth processes, MOCVD processes and (micro) emulsion processes. These methods are described in detail in the literature.
- the particles are obtained by the sol-gel method or precipitation method.
- Suitable particles may also be commercially available. Thus, e.g. commercially available sols such as e.g. Zirconia sols from Nyacol be used.
- the particles may also be doped, preferably with at least one other metal.
- any suitable metal compound may be added in the preparation of the particles, eg an oxide, salt or complex compound, eg halides, nitrates, sulfates, carboxylates (eg acetates) or acetylacetonates used as molecular precursors in the preparation of the particles ,
- the other metal may be present in the compound in any suitable oxidation precursor.
- suitable metals for the metal compound are W, Mo, Zn, Cu, Ag, Au, Sn, In, Fe, Co, Ni, Mn, Ru, V, Nb, Ir, Rh, Os, Pd and Pt.
- metals for doping are Mg, Ca, Y, Sc and Ce, in particular for ZrO 2 .
- Specific examples of metal compounds for doping are Y (NO 3 ) 3 -4H 2 O, Sc (NO 3 ) 3 -6H 2 O, WO 3 , MoO 3 , FeCl 3 , silver acetate, zinc chloride, copper (II) chloride, indium (III) oxide and tin (IV) acetate.
- the atomic ratio of doping element / element of the basic compound, eg Zr can be selected as required and is for example from 0.0005: 1 to 0.2: 1.
- non-surface-modified particles in the form of a powder or a suspension may be used in a dispersing agent.
- the powder is suspended in a dispersant.
- the suspension can be used as it is or the dispersant can be exchanged by known methods for another dispersant more suitable for the particular purpose.
- the particles can also be obtained in the dispersant by precipitating a dissolved precursor in situ. The resulting particles are amorphous or semi-crystalline, nanoscale particles that are not surface modified.
- molecular precursors of the particles dissolved in a solvent e.g. be subjected to a condensation and / or precipitation reaction.
- the molecular precursors may be e.g. hydrolyzable compounds, salts or soluble hydroxides.
- the conversion into solid particles can be carried out e.g. by a precipitation reaction in which poorly soluble compounds are formed.
- the particles are obtained by adding water to the solution of the molecular precursors and / or by changing the pH.
- the adjustment of the pH required for the precipitation can be achieved in principle by using any basic or acidic compound which is soluble in the respective solvent.
- Particles of other optionally hydrated elemental oxides can be prepared analogously using the corresponding element compounds, where Zr is in each case to be replaced by the desired element or a mixture of two or more elements.
- Examples of precursors for zirconium oxide are discussed below.
- Examples of other molecular precursors are Y (NO 3 ) 3 (optionally hydrated, for Y 2 O 3 ); Zn-acetate, Mn-acetate; FeCl 2 , FeCl 3 (for iron oxides); Al (NO 3 ) 3 (for Al 2 O 3 ); SnCl 4 , SbCl 3 (for tin oxide or ATO, respectively); Aluminum alcoholates such as Al (O 5 Bu) 3 , titanium alkoxides such as Ti (O 1 Pr) 4 (for Al-coated rutile); Ba (OH) 2 , titanium alkoxides such as titanium tetra- propoxide (for barium titanate); Na 2 WO 4 , calcium carboxylates such as Ca (O 2 Pr) 2 (for calcium tungstate); or InCI 3 , SnCI 4 (for ITO).
- ZrO (NO 3 ) 2 ZrCl 4 or zirconium alcoholates (Zr (OR 4 ), where R is alkyl, preferably C 1 -C 4 -alkyl).
- Zr (OR 4 ) zirconium alcoholates
- Examples of dopants are listed above.
- amorphous or semi-crystalline nanoscale particles of ZrO 2 or hydrated ZrO 2 are precipitated by changing the pH and / or by addition of water ,
- the sol or solution additionally contains one or more doping elements likewise in the form of molecular precursors which can be precipitated, for example, as oxide or hydrated oxide.
- the doping elements are, for example, those which are suitable for the production of glass or ceramic, for example Mg, Ca, Y, Sc and Ce.
- the zirconium-containing solution or zirconium-containing sol may be both aqueous and non-aqueous (organic).
- An aqueous starting solution contains Zr-containing molecular precursors in a dissolved form and molecular precursors optionally containing doping elements, which can be precipitated by changing the pH as oxide or hydrated oxide of Zr, which is optionally doped.
- Corresponding nonaqueous solutions may contain corresponding molecular precursors which can be precipitated without changing the pH, e.g. by mere addition of water.
- the zirconium-containing molecular precursor comprising oxide or hydrated oxide and, if appropriate, the molecular precursors containing further precipitable elements for doping are preferably hydrolyzable salts in aqueous starting solutions; hydrolyzable compounds and, in particular, hydrolyzable organometallic compounds are preferred in nonaqueous solutions.
- simple salt solutions which can be prepared, for example, by hydrolyzing a metal alkoxide which is dissolved in, for example, a short-chain alcohol (for example a C 1 -C 3 -alcohol) by addition of water.
- a general method for the preparation of nanoscale particles of hydrolyzable compounds is the sol-gel method.
- hydrolyzable compounds are hydrolyzed with water, optionally with acidic or basic catalysis, and optionally at least partially condensed.
- the hydrolysis and / or condensation reactions lead to the formation of compounds or condensates with hydroxyl, oxo groups and / or oxo bridges which serve as precursors. It is possible to use stoichiometric amounts of water, but also smaller or larger quantities.
- the forming SoI can be determined by suitable parameters, e.g. Condensation degree, solvent or pH to which the viscosity desired for the coating composition is adjusted. Further details of the sol-gel process are e.g. at CJ. Brinker, G.W. Scherer: "SoI-GeI Science - The Physics and Chemistry of Sol-Ge-Processing", Academic Press, Boston, San Diego, New York, Sydney (1990).
- the mean particle diameter of the nanoscale particles used in step a) can be greater than that of the particles obtained by the process according to the invention. At least, larger particles are usually present after the execution of step a), since the particles are then usually present in agglomerated or aggregated form. Nanoscale particles have an average particle diameter of less than 1 ⁇ m. The nanoscale particles used in step a) preferably have an average particle diameter of less than 0.2 ⁇ m.
- the nanoscale particles used in step a) are amorphous or partially crystalline. Furthermore, the nanoscale particles used in step a) are not surface-modified particles, ie no modifying agents are present on the surface.
- the dispersant any solvent can be used so long as it does not dissolve or substantially dissolve the particles to be treated.
- the suitable dispersant is preferably selected from water or organic solvents, depending on the particles to be treated, but also inorganic solvents such as carbon disulfide are conceivable.
- a particularly preferred dispersant is water, especially deionized water.
- Suitable organic dispersants are both polar and nonpolar and aprotic solvents. Examples of these are alcohols, e.g. aliphatic and alicyclic alcohols having 1 to 8 carbon atoms (especially methanol, ethanol, n- and i-propanol, butanol, octanol, cyclohexanol), ketones, e.g. aliphatic and alicyclic ketones of 1 to 8 carbon atoms (especially acetone, butanone and cyclohexanone), esters such as e.g. Ethyl acetate and glycol esters, ethers, e.g.
- glycol ethers such as mono-, di-, tri- and polyglycol ethers
- glycols such as ethylene glycol, diethylene glycol and propylene glycol
- amides and other nitrogen compounds e.g. Dimethylacetamide, dimethylformamide, pyridine, N-methylpyrrolidine and acetonitrile, sulfoxides and sulfones, e.g.
- nitro compounds such as nitrobenzene, halogenated hydrocarbons, such as dichloromethane, chloroform, carbon tetrachloride, trichlorethylene, tetrachloroethene, ethylene chloride, chlorofluorocarbons, aliphatic, alicyclic or aromatic hydrocarbons, e.g. with 5 to 15 carbon atoms, such as e.g.
- Preferred organic dispersants are aliphatic and alicyclic alcohols such as ethanol, n- and i-propanol, glycols such as ethylene glycol, and aliphatic, alicyclic and aromatic hydrocarbons such as hexane, heptane, toluene and o-, m- and p-xylene. Particularly preferred dispersants are ethanol and toluene. After the suspension of nanoscale particles has been formed or provided by any of the above methods, it undergoes conditions which result in densification and / or crystallization of the nanoscale particles.
- the specific conditions such as temperature, pressure and duration, of course, for example, depend on the nature and nature of the particles used and the solvent, the mode of operation and also on each other.
- the person skilled in the art can choose the appropriate conditions for the compaction and / or crystallization of the particles on the basis of his expertise. Appropriate areas are given below.
- the heat treatment is expediently carried out under conditions in which the suspension or more precisely the dispersant remains essentially in the liquid phase, ie the crystallization / densification in the liquid phase takes place.
- the suspension is exposed to crystallization and / or compression of an elevated temperature and optionally to an elevated pressure.
- This treatment is preferably carried out below the critical data of the solvent present.
- the elevated temperatures must also ensure that the solvent does not decompose or only slightly decomposes.
- This treatment can be carried out both in a batch process and in a continuous manner. Through the use of continuous systems, the reaction time can be significantly reduced. In general, the duration of treatment may be e.g. 1 minute to 3 days or 1 minute to 24 hours.
- the treatment time in particular in the case of continuous processes, is preferably in the range from 1 minute to 2 hours, preferably from 5 minutes to 60 minutes, particularly preferably from 10 minutes to 30 minutes.
- elevated temperature is meant for the heat treatment in general a temperature of at least 60 ° C and particularly preferably at least 80 ° C, for example 120 to 400 ° C.
- the heat treatment is particularly preferably carried out in a temperature range from 150 to 350 ° C.
- the pressure can be ambient pressure or excess pressure, for example in the range from 1 to 300 bar.
- the heat treatment preferably takes place at elevated pressure of more than 1 bar.
- the pressure may be at least about 5 bar, for example.
- an elevated pressure of about 10 to 300 bar is used.
- the suspension containing the nanoscale particles is preferably added to a pressure vessel without further pretreatment and, if appropriate, treated at the appropriate pressure and temperature.
- an autogenous pressure is built up, ie by the heating, in particular on the boiling point of the solvent, a pressure is built up in the closed pressure vessel or autoclave.
- the treatment is usually a lyothermal and preferably a hydrothermal treatment.
- a hydrothermal treatment generally means a heat treatment of an aqueous solution or suspension under overpressure, e.g. at a temperature above the boiling point of the Wegs ⁇ means and a pressure above 1 bar.
- the dispersing agent comprises water or it preferably consists essentially of water.
- crystalline and / or compressed particles are obtained from amorphous or partially crystalline particles.
- Semicrystalline particles include not only crystalline phases but also amorphous phases, i. it can be detected amorphous areas.
- Crystalline particles consist essentially entirely of crystalline phase, i. there is essentially no amorphous portion or measurable amorphous portion.
- Compacted particles are here particles which are for the most part or preferably substantially maximally compressed, that is, can not be densified further based on their chemical structure. Nanoparticles can e.g. have less ordered areas in the outer area of the particle, resulting in X-ray propagation. These areas may be densified by the method of the invention.
- Crystallization and compression are often mutually dependent.
- a seal can often be associated with a crystallization.
- a crystallization is usually also a compaction.
- crystalline, surface-modified, nanoscale particles are preferably obtained, ie, the particles essentially contain no amorphous particles.
- heat treatment is carried out in step a) in order to crystallize the particles.
- the obtained crystalline particles are then surface-modified in step b).
- such crystallization is often associated with compaction of the particles.
- Crystalline particles usually show a baseline from which individual peaks emerge. For example, are in Ulimanns, Encyclopedia of Industrial Chemistry, Verlag Chemie, 4th Edition, Vol. 5, pages 256 and 257, X-ray diffraction patterns of particles with different content of crystalline phase listed. The person skilled in the art can determine whether an amorphous fraction can still be measured in the particles.
- FIG. 1 shows an X-ray diffraction diagram of ZKV particles which were used as starting particles for the process.
- the diagram shows that amorphous phases are present in the particles.
- the hump at about 30 ° indicates that the particles also contain crystalline phases.
- the particles are thus partially crystalline.
- Fig. 2 shows an X-ray diffraction pattern of the particles of Fig. 1, from which after crystallization according to step a) crystalline particles have been obtained.
- the crystalline particles show in the diagram e.g. Peaks at about 30 °, 50 ° and 60 °.
- crystallized and / or compacted, not surface-modified, nanoscale particles are obtained as a suspension in a dispersant, which are usually more or less agglomerated or aggregated.
- the suspension may be used as it is directly or, if another dispersant is more convenient, after replacement of the dispersant in step b).
- a purification step in order to at least partially or completely remove process by-products in the suspension obtained after step a).
- the dispersant is preferably at least partially replaced with fresh dispersant, which may be the same as before or otherwise.
- the suspensions of densified or crystallized particles of process by-products such as alcohols
- process by-products such as alcohols
- hydrolysis of alkoxides or ionic impurities which arise when using salt solutions, separated and, if necessary, concentrated or dried.
- the removal of the process by-products can be done by simple removal (even partial) or replacement of the solvent. All methods known to those skilled in the art are suitable for this purpose.
- the preferred starting point is that nanoparticles agglomerate or flocculate at their isoelectric point.
- the suspensions obtained from the heat treatment are adjusted to the corresponding isoelectronic pH and flocculated. The adjustment takes place by means of acids and bases.
- the supernatant containing the process by-products is removed after sedimentation of the nanoscale particles.
- the resulting high-solids sedimentation product contains the nanoscale particles, by addition of e.g. distilled water is again obtained diluted suspensions. If appropriate, the process of flocculation and the removal of the supernatant can be repeated until the process by-products have been removed or largely removed.
- high-purity and high-solids nanoscale particles containing suspensions can be prepared in an organic solvent or preferably aqueous suspensions. From these, by complete removal of the organic solvent or water by methods such as e.g. Distillation or freeze-drying powder can be produced. It is also possible to prepare non-aqueous suspensions from the high-purity aqueous suspensions containing the particles. This can e.g. by processes such as solvent exchange.
- step b) suspensions or colloids of crystalline and / or compacted, surface-surface-modified, nanoscale particles are obtained from the crystallized and / or compacted, non-surface-modified, nanoscale particles obtained in step a), which have optionally been subjected to a purification step or a dispersant exchange , produced by passing the suspension directly to a mechanically activated process under high shear in the presence of a Surface modifier is subjected.
- a specific surface modification takes place and at the same time a stabilization of the particles against agglomeration.
- deagglomeration or deaggregation of the particles also takes place.
- powders can be obtained from the particles by removing the dispersant.
- the particles are mechanically activated in the dispersant in the presence of a modifying agent, that is to say, in the mechanical activation, in the presence of the modifying agent, an interaction of the modifying agent with the particle or the comminuted particle takes place, preferably a chemical bond.
- this mechanical activation also leads to deagglomeration or deaggregation, i. a crushing.
- the mechanical input of energy is in particular so high that the particles are surface-modified.
- Such a reaction under mechanical stress is also called chemo-mechanical reaction.
- the modifier used can also act as a dispersant at the same time, so that the same compound is used for both.
- the modifying agent preferably has at least one functional group which at least under the conditions of mechanical activation chemical bond with the surface groups of the particles can enter.
- the chemical bond is preferably a covalent, ionic or coordinate bond between the modifier and the particle, but also hydrogen bonds.
- a coordinative bond is meant a complex formation.
- an acid / base reaction according to Bronsted or Lewis a complex formation or an esterification can take place between the functional groups of the modifier and the particle.
- the functional group comprising the modifying agent is preferably carboxylic acid groups, acid chloride groups, ester groups, nitrile and isonitrile groups, OH groups, SH groups, epoxide groups, anhydride groups, acid amide groups, primary, secondary and tertiary amino groups, Si-OH Groups, hydrolyzable groups of silanes (groups Si-OR explained below) or CH-acid groups, as in ⁇ -dicarbonyl compounds.
- the modifying agent may also comprise more than one such functional group, e.g. in betaines, amino acids or EDTA.
- the modifying agent In addition to the at least one functional group which can form a chemical bond with the surface group of the particle, the modifying agent generally has a molecular radical which, after linking the modifying agent via the functional group, modifies the properties of the particle.
- the remainder of the molecule or a part thereof may be, for example, hydrophobic or hydrophilic or carry a second functional group in order to functionalize the colloid particles with respect to the environment, ie to stabilize, compatibilize, inertise or reactivate, for example.
- the colloid particles obtained according to the invention are provided with a function or surface functionalization by this molecular residue.
- the invention makes it possible to obtain nanoscale particles with tailor-made surface chemistry adapted to the desired intended use.
- hydrophobic molecule radicals can be, for example, alkyl, aryl, alkaryl, aralkyl or fluorine-containing alkyl groups which, if the environment is suitable, can lead to inerting or repulsion.
- hydrophilic groups would be hydroxy, alkoxy or polyether groups.
- the optionally present second functional group of the modifying agent may be, for example, an acidic, basic or ionic group. It may also be a functional group suitable for a chemical reaction with a selected reactant.
- the second functional group can be the same, which is also suitable as a functional group for binding to the particle, so that reference is made to the examples mentioned there.
- Other examples of a second functional group would be epoxy, acryloxy, methacryloxy, acrylate or methacrylate groups. There may be two or more of the same or different such functional groups.
- the modifier preferably has a molecular weight of not more than 500, more preferably not more than 400, and especially not more than 200.
- the compounds are preferably liquid under normal conditions.
- the functional groups carrying these compounds depend primarily on the surface groups of the particulates and the desired interaction with the environment. Molecular weight also plays an important role in diffusion to the freshly formed particle surfaces. Small molecules lead to a rapid occupancy of the surface and thus reduce recombination.
- Suitable modifying agents are saturated or unsaturated mono- and polycarboxylic acids, the corresponding acid anhydrides, acid chlorides, esters and acid amides, amino acids, imines, nitriles, isonitriles, epoxy compounds, mono- and polyamines, ⁇ -dicarbonyls such as ⁇ -diketones, silanes and metal compounds having a functional group capable of reacting with the surface groups of the particles.
- Particularly preferably used modifying agents are silanes, carboxylic acids, ⁇ -dicarbonyls, amino acids and amines.
- the carbon chain of these compounds may be interrupted by O, S, or NH groups.
- One or more modifiers may be used.
- Preferred saturated or unsaturated monocarboxylic and polycarboxylic acids are those having 1 to 24 carbon atoms, such as, for example, formic acid, acetic acid, propionic acid, butyric acid, pentanoic acid, hexanoic acid, acrylic acid, methacrylic acid, crotonic acid, citric acid, adipic acid, succinic acid, Glutaric acid, oxalic acid, maleic acid, fumaric acid, itaconic acid and stearic acid and the corresponding acid anhydrides, chlorides, esters and amides, for example caprolactam.
- carboxylic acids Of these carboxylic acids mentioned above, those are also included whose carbon chain is interrupted by O, S or NH groups. Particularly preferred are ether carboxylic acids such as mono- and polyether carboxylic acids and the corresponding acid anhydrides, chlorides, esters and amides, for example methoxyacetic acid, 3,6-dioxaheptanoic acid and 3,6,9-trioxadecanoic acid.
- ether carboxylic acids such as mono- and polyether carboxylic acids and the corresponding acid anhydrides, chlorides, esters and amides, for example methoxyacetic acid, 3,6-dioxaheptanoic acid and 3,6,9-trioxadecanoic acid.
- Preferred ⁇ -dicarbonyl compounds are those having 4 to 12, in particular 5 to 8, carbon atoms, for example diketones, such as acetylacetone, 2,4-hexanedione, 3,5-heptanedione, acetoacetic acid, C 1 -C 4 -alkyl acetoacetate, such as acetoacetic acid ethyl ester, diacetyl and acetonylacetone.
- diketones such as acetylacetone, 2,4-hexanedione, 3,5-heptanedione
- acetoacetic acid C 1 -C 4 -alkyl acetoacetate
- acetoacetic acid ethyl ester such as acetoacetic acid ethyl ester
- diacetyl and acetonylacetone such as acetoacetic acid ethyl ester, diacetyl and acetonylacetone.
- silanes have at least one nonhydrolyzable group or a hydroxy group, more preferably hydrolyzable organosilanes are used, which additionally have at least one nonhydrolyzable radical.
- Preferred silanes have the general formula (I)
- the value a is preferably 1.
- the hydrolysable groups X which may be the same or different, for example, hydrogen or halogen (F, Cl, Br or I), alkoxy (preferably Ci -6 alkoxy, such as methoxy, ethoxy, n-propoxy, i-propoxy and butoxy), aryloxy (preferably C 6 i 0 aryloxy, such as phenoxy), acyloxy (preferably Ci-6-acyloxy, such as acetoxy or propionyloxy), alkylcarboxylic carbonyl (preferably C 2 - 7 alkyl-carbonyl such as acetyl), amino, monoalkylamino or dialkylamino having preferably 1 to 12, especially 1 to 6 carbon atoms.
- Preferred hydrolyzable radicals are halogen, alkoxy groups and acyl oxy groups. Particularly preferred hydrolysable radicals are C 1-4 alkoxy groups, in particular methoxy and ethoxy.
- nonhydrolyzable radicals R which may be the same or different, may be nonhydrolyzable radicals R with or without a functional group.
- the non-hydrolyzable radical R without a functional group is, for example, alkyl (preferably C 1-8 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl and tert-butyl, pentyl, hexyl, octyl or cyclohexyl), alkenyl (preferably C 2-6 alkenyl such as vinyl, 1-propenyl, 2-propenyl and butenyl), alkynyl (preferably C 2-6 alkynyl such as acetylenyl and propargyl), aryl (preferably C 6-10 -aryl, such as phenyl and naphthyl) and corresponding alkaryls and aralkyls (eg ToIyI, Be ⁇ zyl and phenethyl).
- the radicals R and X may optionally have one or more customary substituents, such as
- the nonhydrolyzable radical R having a functional group may e.g. as a functional group an epoxide (eg glycidyl or glycidyloxy), hydroxy, ether, amino, monoalkylamino, dialkylamino, optionally substituted anilino, amide, carboxy, acrylic, acryloxy, methacrylic, Methacryloxy, mercapto, cyano, alkoxy, isocyanato, aldehyde, alkylcarbonyl, acid anhydride and Phosphorkla ⁇ group.
- These functional groups are bonded to the silicon atom via alkylene, alkenylene or arylene bridging groups which may be interrupted by oxygen or -NH groups.
- the bridging groups preferably contain 1 to 18, preferably 1 to 8 and in particular 1 to 6 carbon atoms.
- the divalent bridging groups mentioned and optionally present substituents, as in the case of the alkylamino groups, are derived, for example, from from the above-mentioned monovalent alkyl, alkenyl, aryl, alkaryl or aralkyl radicals.
- the radical R may also have more than one functional group.
- non-hydrolysable radicals R having functional groups are a glycidyl or glycidyloxy- (C -20) alkylene radical, such as beta-glycidyloxyethyl, ⁇ -glycidyloxypropyl, ⁇ -Glycidyloxybutyl, ⁇ -Glycidyloxypentyl, ⁇ -Glycidyloxyhexyl, and 2- (3,4-epoxycyclohexyl) ethyl, a (meth) acryloxy (Ci -6) -alkylene radical, for example (meth) acrylic oxymethyl, (meth) acryloxyethyl, (meth) acryloxypropyl or (meth) acryloxybutyl, and a 3-lsocyanatopropylrest.
- Particularly preferred radicals are ⁇ -glycidyloxypropyl and (meth) acryloxypropyl.
- silanes are ⁇ -glycidyloxypropyltrimethoxysilane (GPTS), ⁇ -glycidyloxypropyltriethoxysilane (GPTES), 3-isocyanatopropyltriethoxysilane, 3-isocyanato-propyldichlorosilane, 3-aminopropyltrimethoxysilane (APTS), 3-aminopropyltriethoxysilane (APTES), N- (2 -Aminoethyl) -3-aminoproyltrimethoxysilane, N- [N '- (2'-aminoethyl) -2-aminoethyl] -3-aminopropyltrimethoxysilane, hydroxymethyltriethoxysilane, 2- [methoxy (polyethyleneoxy) propyl] trimethoxysilane, bis (hydroxyethyl) 3-aminopropyltriethoxys
- silanes which at least partially have organic radicals which are substituted by fluorine.
- Such silanes are described in detail in WO 92/21729.
- hydrolyzable silanes having at least one nonhydrolyzable radical which have the general formula
- Rf is a nonhydrolyzable group having 1 to 30 fluorine atoms bonded to carbon atoms, preferably separated from Si by at least two atoms, preferably an ethylene group, and b 0, 1 or 2 is.
- R is in particular a radical without a functional group, preferably an alkyl group such as methyl or ethyl.
- the groups contain Rf 3 to 25 and especially 3 to 18 fluorine atoms which are bonded to aliphatic carbon atoms.
- R f is preferably a fluorinated alkyl group of 3 to 20 carbon atoms and examples are CF 3 CH 2 CH 2 -, C 2 F 5 CH 2 CH 2 -, nC 6 Fi 3 CH 2 CH 2 -, JC 3 F 7 OCH 2 CH 2 CH 2 -, nC 8 F 17 CH 2 CH 2 - and nC 10 F 2 i-CH 2 CH 2 -.
- the silanes can be prepared by known methods; see. W. NoII, "Chemistry and Technology of Silicones", Verlag Chemie GmbH, Weinheim / Bergstrasse (1968).
- a complexing agent such as a ß-dicarbonyl compound or a (mono) carboxylic acid
- zirconium and titanium tetraalcoholates in which part of the alkoxy groups has been replaced by a complexing agent such as, for example, a ⁇ -dicarbonyl compound or a carboxylic acid, preferably a monocarboxylic acid.
- Surfactants may also be used as modifiers.
- Surfactants can form micelles. Most of the modifiers discussed above are not surfactants, i. they do not form micelles even at high concentrations. This behavior relates to the pure dispersant. In the presence of the particles, the modifiers naturally also enter into the chemical interactions with the particles described according to the invention. All conventional surfactants known to those skilled in the art can be used. Usually, modifiers which are not surfactants, e.g. the ones discussed above.
- any solvent can be used as long as it does not or substantially not dissolve the particles to be treated and is also inert or substantially inert to the modifier used.
- the solvents mentioned for step a) can be listed. Often it is useful to carry out step a) and b) in the same solvents.
- the substances used according to the invention can be mixed with one another in any desired sequence. The mixture can be carried out directly in the device for the mechanical activation or previously in a separate container, eg a mixer. Preferably, no further additives are added otherwise, ie the mixture consists of at least one dispersing agent, at least one modifying agent, which in special case may correspond to the dispersing agent, and the particles.
- additives which are optionally mixed are defoamers, pressing aids, organic binders, photocatalysts, colorants, sintering aids, preservatives and rheological additives.
- defoamers pressing aids
- organic binders organic binders
- photocatalysts colorants
- sintering aids preservatives and rheological additives.
- the addition of additives is only necessary if they are needed for further processing. Therefore, these additives may also be added after the processing according to the invention.
- An advantage for a previous addition may be in the homogenous mixture obtained by the milling.
- the mechanical activation is usually a strong shear, whereby surface-modified particles are obtained.
- the mechanically activated high shear process may be carried out by conventional and known means, such as crushing, kneading or grinding equipment.
- suitable devices are dispersers, turbine agitators, jet jet dispersers, roller mills, mills and kneaders.
- kneaders and mills are used.
- mills and kneaders are mills with loose Mahl ⁇ tools, such as ball, rod, drum, cone, tube, autogenous, planetary, vibrating and stirrer mills, Scherwalzenkneter, mortar mills and Kolloid ⁇ mills.
- the appropriate temperature for the particular system may optionally be adjusted by those skilled in the art.
- the mechanically activated process preferably takes place at room temperature or ambient temperature (eg 15 to 30 ° C.), ie it is not heated.
- the mechanical activation may cause heating of the suspension. This may be desirable. If necessary, but can also be cooled. Cooling units usually prevent the temperature from rising to the boiling point of the solvent. Normally, work is carried out in such a way that during the mechanical activation a tempe- Temperature of ambient temperature to 7O 0 C or 60 0 C 1 preferably ambient temperature to below 5O 0 C, is achieved.
- the temperature is preferably below the boiling point of the solvent used.
- the duration of the mechanical activation depends in particular on the solids content of the suspensions used, the dispersant and the surface modifier, it can be from several minutes to days.
- the mechanical stress for activation can also be done in a two- or multi-stage design. It can e.g. consist of upstream steps and a subsequent step, wherein the modifying agent in each step or only in at least one step, e.g. the last, may be present.
- a grinding step with coarser grinding media can be used upstream in order to achieve the optimum, efficient starting particle size for the final step.
- the particle content of the suspensions, which are subjected to the mechanically activated process under high shear depends, inter alia. from the device used.
- the particle content in kneaders is generally between 98 and 50% by volume of the suspension. When using mills, the particle content is generally up to 60% by volume of the suspension.
- the weight ratio of particles / modifier is generally 100: 1 to 100: 35, in particular 100: 2 to 100: 25 and particularly preferably 100: 4 to 100: 20.
- the amount of particles / grinding media present in the grinding chamber necessarily results from the solids content of the suspension and the degree of filling of grinding balls used and the bulk density of the grinding balls.
- the mechanically activated process can be supported by additional energy input (in addition to the applied mechanical energy), for example by means of micro wave and / or ultrasound, whereby these two methods can also be used simultaneously.
- additional energy input in addition to the applied mechanical energy
- the energy input into the dispersion takes place directly in the Device for mechanical activation, but can also be done outside the Vor ⁇ direction in the product cycle.
- the process can be carried out both continuously in one-pass operation, multiple-pass operation (pendulum process) or cyclic process and batchwise in batch operation.
- modifier is at least partially chemically bound to the particles, which as a rule are simultaneously deagglomerated and / or deaggregated.
- step b) highly dispersed surface-modified nanoscale particles below 100 nm can be obtained.
- the average particle diameter of the particles obtained is generally not more than 50 nm, preferably not more than 30 nm and particularly preferably not more than 20 nm.
- the process according to the invention makes it even possible to use surface-modified, crystalline and / or compacted, doped and undoped Produce nanoparticles or colloids having an average particle diameter or a mean smallest dimension down to about 1 nm.
- the average particle diameter here means the particle diameter based on the volume average (d.sub.50 value), an UPA (Ultrafine Particle Analyzer, Leeds Northrup (laser-optical, dynamic laser light scattering)) being used for the measurement.
- UPA Ultra-Particle Analyzer
- Leeds Northrup laser-optical, dynamic laser light scattering
- HR-TEM electron microscopic methods
- the average particle diameter is also sometimes given as the mean smallest dimension, which may be the mean diameter or the mean height or width, whichever is smaller.
- the mean smallest dimension is for example the average particle diameter for spherical particles and the mean height for platelet-shaped particles.
- the mean smallest dimension also refers here to the volume average.
- the nanoparticles can be obtained by removing the dispersant as a powder.
- any known method may be used, e.g. Evaporation, centrifugation or filtration.
- the resulting particles are on the surface of the bound Modcertainsstoffmoleküle whose functionality can control the properties of the particles.
- the particles may then be resupplied in the same or another suitable dispersant, with no or relatively little aggregation, so that the average particle diameter can be substantially maintained.
- the surface-modified, crystalline and / or compacted, doped and undoped nanoparticles or colloids can be worked up further by known methods. They can be reacted, for example, with other surface modifiers, they can be dispersed in organic or aqueous solvents, and soluble polymers, oligomers or organic monomers or sols or additives, such as those listed above, can be admixed. Such mixtures, work-ups or the surface-modified, crystalline and / or densified, doped and undoped nanoparticles or colloids as such can be used, for example, for the production of coatings or moldings or for other applications.
- Examples of possible fields of use of the surface-modified, crystalline and / or compacted, doped or undoped nanoparticles or colloids or of mixtures comprising these, in particular for corresponding ZrO 2 particles include the production of moldings, films, membranes and coatings or of compounds or hybrid materials.
- the products, in particular the coatings or layers can serve for very different purposes, for example as coatings with low-energy surfaces or as abrasion-resistant, oxygen-ion conductive, microbicidal, photocatalytic, microstructurable or microstructured, holographic, conductive, UV-absorbing, photochromic and / or electrochromic products or layers.
- TEM average particle size of 4 to 8 nm
- d 50 14 nm
- TEM average particle size of 8-10 nm
- UPA average diameter
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Abstract
Description
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BRPI0515853-2A BRPI0515853A (pt) | 2004-10-04 | 2005-10-03 | processo para a produção de uma suspensão de nanopartìculas, modificadas na superfìcie |
JP2007533960A JP2008515747A (ja) | 2004-10-04 | 2005-10-03 | カスタムな表面化学を有するナノ粒子及び対応するコロイドの製造方法 |
MX2007004093A MX2007004093A (es) | 2004-10-04 | 2005-10-03 | Procedimiento para produccion de nanoparticulas con un quimica de superficie especial y los coloides corresponientes. |
US11/574,471 US20090004098A1 (en) | 2004-10-04 | 2005-10-03 | Process for the Production of Nanoparticles with Tailor-Made Surface Chemistry and Corresponding Colloids |
EP05790372A EP1797006A2 (de) | 2004-10-04 | 2005-10-03 | Verfahren zur herstellung von nanopartikeln mit massgeschneiderter oberflächenchemie und entsprechenden kolloiden |
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2005
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- 2005-10-03 US US11/574,471 patent/US20090004098A1/en not_active Abandoned
- 2005-10-03 MX MX2007004093A patent/MX2007004093A/es unknown
- 2005-10-03 BR BRPI0515853-2A patent/BRPI0515853A/pt not_active IP Right Cessation
- 2005-10-03 CN CNA2005800336384A patent/CN101124166A/zh active Pending
- 2005-10-03 EP EP05790372A patent/EP1797006A2/de not_active Withdrawn
- 2005-10-03 WO PCT/EP2005/010643 patent/WO2006037591A2/de active Application Filing
- 2005-10-03 KR KR1020077007657A patent/KR20070098781A/ko not_active Withdrawn
- 2005-10-03 JP JP2007533960A patent/JP2008515747A/ja not_active Withdrawn
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JP2009136710A (ja) * | 2007-12-03 | 2009-06-25 | Inoue Mfg Inc | ロールミル及びそれを用いた分散または粉砕方法 |
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EP2202205A1 (de) | 2008-12-23 | 2010-06-30 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Nanopartikuläre Titandioxid-Partikel mit kristallinem Kern, einer Schale aus einem Metalloxid und einer Aussenhaut, die organische Gruppen trägt, sowie Verfahren zu deren Herstellung |
WO2010072688A1 (de) | 2008-12-23 | 2010-07-01 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Nanopartikulare titandioxid-partikel mit kristallinem kern, einer schale aus einem metalloxid und einer aussenhaut, die organische gruppen trägt, sowie verfahren zu deren herstellung |
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Also Published As
Publication number | Publication date |
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BRPI0515853A (pt) | 2008-09-16 |
EP1797006A2 (de) | 2007-06-20 |
US20090004098A1 (en) | 2009-01-01 |
DE102004048230A1 (de) | 2006-04-06 |
WO2006037591A3 (de) | 2006-12-28 |
KR20070098781A (ko) | 2007-10-05 |
MX2007004093A (es) | 2007-06-15 |
JP2008515747A (ja) | 2008-05-15 |
TW200613215A (en) | 2006-05-01 |
CN101124166A (zh) | 2008-02-13 |
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