WO2018154364A1 - A composition redispersible in polar and non-polar solvents - Google Patents
A composition redispersible in polar and non-polar solvents Download PDFInfo
- Publication number
- WO2018154364A1 WO2018154364A1 PCT/IB2017/051121 IB2017051121W WO2018154364A1 WO 2018154364 A1 WO2018154364 A1 WO 2018154364A1 IB 2017051121 W IB2017051121 W IB 2017051121W WO 2018154364 A1 WO2018154364 A1 WO 2018154364A1
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- WIPO (PCT)
- Prior art keywords
- composition
- acid
- alkali metal
- metal salt
- zinc oxide
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 94
- 239000012454 non-polar solvent Substances 0.000 title claims abstract description 12
- 239000002798 polar solvent Substances 0.000 title claims abstract description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 141
- 239000011787 zinc oxide Substances 0.000 claims abstract description 71
- 239000002105 nanoparticle Substances 0.000 claims abstract description 63
- -1 alkali metal salt Chemical class 0.000 claims abstract description 55
- 239000002253 acid Substances 0.000 claims abstract description 51
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 50
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims abstract description 46
- 150000002148 esters Chemical class 0.000 claims abstract description 45
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 235000002639 sodium chloride Nutrition 0.000 claims description 54
- 239000006185 dispersion Substances 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 14
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 12
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 claims description 12
- YHAIUSTWZPMYGG-UHFFFAOYSA-L disodium;2,2-dioctyl-3-sulfobutanedioate Chemical compound [Na+].[Na+].CCCCCCCCC(C([O-])=O)(C(C([O-])=O)S(O)(=O)=O)CCCCCCCC YHAIUSTWZPMYGG-UHFFFAOYSA-L 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 239000002243 precursor Substances 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 10
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical group CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 8
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000001632 sodium acetate Substances 0.000 claims description 7
- 235000017281 sodium acetate Nutrition 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 239000004317 sodium nitrate Substances 0.000 claims description 7
- 235000010344 sodium nitrate Nutrition 0.000 claims description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 6
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 claims description 4
- 230000003301 hydrolyzing effect Effects 0.000 claims description 4
- 239000004246 zinc acetate Substances 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 3
- 239000011592 zinc chloride Substances 0.000 claims description 3
- 235000005074 zinc chloride Nutrition 0.000 claims description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 3
- 239000011686 zinc sulphate Substances 0.000 claims description 3
- 235000009529 zinc sulphate Nutrition 0.000 claims description 3
- ICAXUQIEOXHXKK-UHFFFAOYSA-N 1,4-dioxo-1,4-di(tridecoxy)butane-2-sulfonic acid Chemical compound CCCCCCCCCCCCCOC(=O)CC(S(O)(=O)=O)C(=O)OCCCCCCCCCCCCC ICAXUQIEOXHXKK-UHFFFAOYSA-N 0.000 claims 2
- 239000002245 particle Substances 0.000 description 17
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- QQYSPMBMXXCTGQ-UHFFFAOYSA-N 1,4-dioxo-1,4-di(tridecoxy)butane-2-sulfonic acid;sodium Chemical compound [Na].CCCCCCCCCCCCCOC(=O)CC(S(O)(=O)=O)C(=O)OCCCCCCCCCCCCC QQYSPMBMXXCTGQ-UHFFFAOYSA-N 0.000 description 11
- 239000004698 Polyethylene Substances 0.000 description 10
- 229920000573 polyethylene Polymers 0.000 description 10
- 230000000845 anti-microbial effect Effects 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 8
- 241000894006 Bacteria Species 0.000 description 7
- 239000004599 antimicrobial Substances 0.000 description 5
- 239000003125 aqueous solvent Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- 241000191967 Staphylococcus aureus Species 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- 241000191070 Escherichia coli ATCC 8739 Species 0.000 description 2
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920003026 Acene Polymers 0.000 description 1
- 244000063299 Bacillus subtilis Species 0.000 description 1
- 235000014469 Bacillus subtilis Nutrition 0.000 description 1
- 241000588697 Enterobacter cloacae Species 0.000 description 1
- 241000194032 Enterococcus faecalis Species 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000588747 Klebsiella pneumoniae Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 241001648298 Propionivibrio Species 0.000 description 1
- 241000588770 Proteus mirabilis Species 0.000 description 1
- 241000588767 Proteus vulgaris Species 0.000 description 1
- 241000589516 Pseudomonas Species 0.000 description 1
- 241000607142 Salmonella Species 0.000 description 1
- 241000293871 Salmonella enterica subsp. enterica serovar Typhi Species 0.000 description 1
- 241000607715 Serratia marcescens Species 0.000 description 1
- 241000193996 Streptococcus pyogenes Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000001332 colony forming effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002674 ointment Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229940007042 proteus vulgaris Drugs 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 230000000475 sunscreen effect Effects 0.000 description 1
- 239000000516 sunscreening agent Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/04—Compounds of zinc
- C09C1/043—Zinc oxide
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/04—Compounds of zinc
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
- C01P2004/52—Particles with a specific particle size distribution highly monodisperse size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- 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
Definitions
- the disclosure relates to zinc oxide nanoparticles. Specifically, the disclosure relates to zinc oxide nanoparticles redispersible in polar and non-polar solvents.
- Zinc oxide nanoparticles find application in white pigment, as a catalyst, as a constituent of anti-bacterial skin protection ointment, in sunscreens, in adhesives for acid scavenging to increase stability and shelf life of products and in wood varnishes.
- Materials used for blocking UV radiation are required to be transparent to the visible part of the solar radiation while blocking the harmful UV radiation and zinc oxide nanoparticles are considered favorable in this regard.
- zinc oxide nanoparticles are in the form of a dry powder.
- dry powder should be dispersible in various mediums.
- the medium in which the zinc oxide nanoparticles are required to be dispersed depends upon the particular application.
- Cosmetics such as sun blocking creams and lotions, UV blocking paints, and adhesives for example require zinc oxide nanoparticles to be dispersible in water.
- Dispersion of zinc oxide nanoparticles in organic solvent is required for example when zinc oxide nanoparticles are required to be added to various polymers such as polyolefins, polyesters, polyamides, polyalcohols, and polysiloxanes for making them anti-microbial and protecting them from UV degradation.
- the present disclosure relates to a composition redispersible in polar and non-polar solvents.
- the composition comprises of zinc oxide nanoparticles having a coating of an alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
- the present disclosure also relates to a method of preparing a composition redispersible in polar and non-polar solvents.
- the method comprises of hydrolyzing a zinc metal precursor dissolved in a solvent to precipitated zinc oxide nanoparticles in a dispersion, separating and drying the precipitated zinc oxide nanoparticles to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid, dissolving an ester of carboxylic acid in toluene to obtain a solution of the ester of carboxylic acid, adding the zinc oxide nanoparticles having a coating of alkali metal salt of an acid to the solution of ester of carboxylic acid to obtain a slurry, and drying the slurry to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
- Figure 1 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in water.
- Figure 2 illustrates the zeta-potential of the 1 % dispersion of an embodiment of the composition.
- Figure 3 illustrates the UV- Visible Spectrum of an embodiment of the composition.
- Figure 4 illustrates the particle size distribution of 4 % dispersion of an embodiment of the composition in xylene.
- Figure 5 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in water.
- Figure 6 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in water.
- Figure 7 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/weight water.
- Figure 8 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/weight water.
- a composition redispersible in polar and non-polar solvents comprises zinc oxide nanoparticles that have a coating of an alkali metal salt of an acid; and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
- the alkali metal salt of an acid is sodium or a potassium salt of an acid.
- the alkali metal salt of an acid is an alkali metal salt of any one of Ci - C22 carboxylic acid, chloride, nitrate or sulphate.
- the alkali metal salt of an acid is sodium acetate, sodium chloride, sodium nitrate or sodium sulphate.
- the concentration of the alkali metal salt of an acid in the composition is in a range of 10 to 22 weight percent.
- the ester of carboxylic acid is selected from C 4 to C 18 ester of carboxylic acid, sodium dioctyl sulfosuccinate and sodium bistridecyl sulfosuccinate.
- the ester of carboxylic acid coated on the zinc oxide nanoparticles determines the solvent in which the composition is dispersible.
- Composition wherein the zinc oxide nanoparticles are coated with sodium dioctyl sufosuccinate is redispersible in water.
- Composition wherein the zinc oxide nanoparticles are coated with sodium bistridecyl sulfosuccinate is redispersible in organic based systems such as resins.
- the concentration of ester of carboxylic acid is in a range of 10 to 22 weight percent.
- At least 70 percent of the zinc oxide nanoparticles in the composition have a size in the range of 20 to 200nm.
- the concentration of zinc oxide nanoparticle in the composition is in a range of 15 to 30 weight percent.
- a method for preparing a composition redispersible in polar and non-polar solvents comprises of hydrolyzing a zinc metal precursor dissolved in a solvent to precipitate zinc oxide nanoparticles in dispersion; separating and drying the precipitated zinc oxide nanoparticles to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid.
- An ester of carboxylic acid is dissolved in toluene to obtain a solution of ester of carboxylic acid.
- the zinc oxide nanoparticles having a coating of alkali metal salt of an acid is added to the solution of carboxylic acid to obtain a slurry.
- the slurry is dried to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
- the zinc metal precursor may be hydrolyzed by sodium hydroxide or potassium hydroxide.
- the zinc metal precursor is selected from any one of zinc acetate, zinc chloride, zinc nitrate and zinc sulphate.
- zinc acetate is dissolved in the solvent N, N dimethyl formamide.
- the ester of carboxylic acid is C 4 to C 18 ester of carboxylic acid, sodium dioctyl sulfosuccinate or sodium bistridecyl sulfosuccinate.
- Example 1 Composition comprising zinc oxide nanoparticles coated with sodium acetate and sodium dioctyl sulfosuccinate is prepared. The concentration of zinc oxide nanoparticles is 27%, sodium acetate is 53 % and sodium dioctyl sulfosuccinate is 20 % in the composition. This composition is used in any aqueous based system for UV blocking and anti-microbial protection.
- Figure 1 illustrates the particle size distribution of 1 % dispersion of the composition in water.
- the UV-visible spectrum of the composition is measured.
- Figure 3 shows the UV- Visible Spectrum of the composition.
- Table 1 Minimum Inhibitory Concentration Data with Input Bacteria Count 10 6 colony forming units/millilitre (cfu/ml) for composition dosage of 0.3 %
- Staphylococcus aureus ATCC 6538 5.20 Bacillus subtilis ATCC 6633 2.42
- composition comprising zinc oxide nanoparticles coated with sodium acetate and sodium bistridecyl sulfosuccinate is prepared.
- concentration of zinc oxide nanoparticles is 28%, sodium acetate is 53% and sodium bistridecyl sulfosuccinate is 20%.
- This composition is used in an organic based system for UV blocking and anti-microbial protection.
- the particle size distribution of 4% composition dispersed in xylene was determined.
- Figure 4 shows the particle size distribution of 4% composition dispersed in xylene.
- the zeta-potential of the composition is also determined.
- the composition is added to polyethylene films and said films are tested for antimicrobial activity. Tables 2 and 3 tabulates the results of the the anti-microbial activity of the composition in polyethylene films.
- Example 3 Composition comprising zinc oxide nanoparticles coated with sodium chloride and sodium dioctyl sulfosuccinate is prepared.
- the composition has 33.28% of zinc oxide nanoparticles, 46.72% of sodium chloride and 20% of sodium dioctyl sulfosuccinate.
- This composition may be used in any aqueous based system for UV blocking and anti-microbial protection.
- the particle size distribution of 1% composition was determined.
- Figure 5 illustrates the particle size distribution of 1 % dispersion of the composition in water.
- Example 4 Composition comprising zinc oxide nanoparticles coated with sodium nitrate and sodium dioctyl sulfosuccinate is prepared.
- the composition comprises 35.80% of zinc oxide nanoparticles, 44.20% sodium nitrate and 20% sodium dioctyl sulfosuccinate.
- This composition is used in any aqueous based system for UV blocking and anti-microbial protection.
- the particle size distribution of 1% composition was determined.
- Figure 6 illustrates the particle size distribution of 1 % dispersion of the composition in water.
- Example 5 Composition comprising zinc oxide nanoparticles coated with sodium chloride and sodium bistridecyl sulfosuccinate is prepared.
- the composition comprises 35.39% of zinc oxide nanoparticles, 44.61% of sodium chloride and 20% of sodium bistridecyl sulfosuccinate.
- the particle size distribution of 1% composition was determined.
- Figure 7 illustrates the particle size distribution of 1 % dispersion of the composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/weight water.
- Example 6 Composition comprising zinc oxide nanoparticles coated with sodium nitrate and sodium bistridecyl sulfosuccinate is prepared.
- the composition comprises 40.68% of zinc oxide, 39.32% of sodium nitrate and 20% of sodium bistridecyl sulfosuccinate.
- Figure 8 illustrates the particle size distribution of 1 % dispersion of the composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/w eight water.
- a composition redispersible in polar and non-polar solvents comprising zinc oxide nanoparticles having a coating of an alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
- composition(s), wherein the alkali metal salt of an acid is a sodium or potassium salt of an acid.
- composition(s), wherein the alkali metal salt of an acid is an alkali metal salt of any one of Ci - C22 carboxylic acid, chloride, nitrate or sulphate.
- composition(s), wherein the alkali metal salt of an acid is any one of sodium acetate, sodium chloride, sodium nitrate or sodium sulphate.
- Such composition(s), wherein the ester of carboxylic acid is C 4 to C 18 ester of carboxylic acid, sodium dioctyl sulfosuccinate, or sodium bistridecyl sulfosuccinate.
- composition(s), wherein the concentration of zinc oxide in the composition is in a range of 15 to 30 weight percent.
- composition(s), wherein the concentration of alkali metal salt of an acid in the composition is 50 to 75 weight percent.
- composition(s), wherein the concentration of ester of carboxylic acid in the composition is in a range of 10 to 22 weight percent.
- composition(s), wherein at least 70 percent of zinc oxide nanoparticles have a size in the range of 20 to 200nm.
- a method of preparing a composition redispersible in polar and non-polar solvents comprising hydrolyzing a zinc metal precursor dissolved in a solvent to precipitated zinc oxide nanoparticles in a dispersion, separating and drying the precipitated zinc oxide nanoparticles to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid, dissolving an ester of carboxylic acid in toluene to obtain a solution of the ester of carboxylic acid, adding the zinc oxide nanoparticles having a coating of alkali metal salt of an acid to the solution of ester of carboxylic acid to obtain a slurry, and drying the slurry to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
- Such method(s), wherein the zinc metal precursor is any one of zinc acetate, zinc chloride, zinc nitrate or zinc sulphate.
- Such method(s), wherein the zinc metal precursor is hydrolysed by sodium hydroxide or potassium hydroxide wherein the zinc metal precursor is hydrolysed by sodium hydroxide or potassium hydroxide.
- ester of carboxylic acid is C 4 to C 18 ester of carboxylic acid, sodium dioctyl sulfosuccinate or sodium bistridecyl sulfosuccinate.
- composition of zinc oxide nanoparticles as disclosed is redispersible in various solvents such as polar/non-polar aqueous solvents and non-aqueous solvents, polymer and resins etc.
- solvents such as polar/non-polar aqueous solvents and non-aqueous solvents, polymer and resins etc.
- As the composition is in a power form it is easy to store and transport.
- the process of preparing the composition is also easy to perform and is economical.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
A composition redispersible in polar and non-polar solvents is disclosed. The composition comprises zinc oxide nanoparticles having a coating of an alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid. A method of preparing such a composition is also disclosed.
Description
A COMPOSITION REDISPERSIBLE IN POLAR AND NON-POLAR SOLVENTS
The disclosure relates to zinc oxide nanoparticles. Specifically, the disclosure relates to zinc oxide nanoparticles redispersible in polar and non-polar solvents.
BACKGROUND
Zinc oxide nanoparticles find application in white pigment, as a catalyst, as a constituent of anti-bacterial skin protection ointment, in sunscreens, in adhesives for acid scavenging to increase stability and shelf life of products and in wood varnishes. Materials used for blocking UV radiation are required to be transparent to the visible part of the solar radiation while blocking the harmful UV radiation and zinc oxide nanoparticles are considered favorable in this regard.
For easy storage and transportation, it is preferred that zinc oxide nanoparticles are in the form of a dry powder. However, such dry powder should be dispersible in various mediums. The medium in which the zinc oxide nanoparticles are required to be dispersed depends upon the particular application. Cosmetics such as sun blocking creams and lotions, UV blocking paints, and adhesives for example require zinc oxide nanoparticles to be dispersible in water. Dispersion of zinc oxide nanoparticles in organic solvent is required for example when zinc oxide nanoparticles are required to be added to various polymers such as polyolefins, polyesters, polyamides, polyalcohols, and polysiloxanes for making them anti-microbial and protecting them from UV degradation.
Therefore, there is a need for zinc oxide nanoparticles that are dispersible in various solvents such as polar/non-polar aqueous solvents and non aqueous solvents, polymer and resins etc.
SUMMARY
The present disclosure relates to a composition redispersible in polar and non-polar solvents. The composition comprises of zinc oxide nanoparticles having a coating of an alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
The present disclosure also relates to a method of preparing a composition redispersible in polar and non-polar solvents. The method comprises of hydrolyzing a zinc metal precursor dissolved in a solvent to precipitated zinc oxide nanoparticles in a dispersion, separating and drying the precipitated zinc oxide nanoparticles to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid, dissolving an ester of carboxylic acid in toluene to obtain a solution of the ester of carboxylic acid, adding the zinc oxide nanoparticles having a coating of alkali metal salt of an acid to the solution of ester of carboxylic acid to obtain a slurry, and drying the slurry to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
BRIEF DESCRIPTION OF FIGURES
The accompanying figures illustrate the preferred embodiments and together with the following detailed description serves to explain the principles of the invention.
Figure 1 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in water.
Figure 2 illustrates the zeta-potential of the 1 % dispersion of an embodiment of the composition.
Figure 3 illustrates the UV- Visible Spectrum of an embodiment of the composition.
Figure 4 illustrates the particle size distribution of 4 % dispersion of an embodiment of the composition in xylene.
Figure 5 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in water.
Figure 6 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in water.
Figure 7 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/weight water.
Figure 8 illustrates the particle size distribution of 1 % dispersion of an embodiment of a composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/weight water. DETAILED DESCRIPTION
For the purpose of promoting an understanding of the principles of the invention, reference will now be made to embodiments and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the disclosed invention, and such further applications of the principles of the invention therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof.
Reference throughout this specification to "one embodiment" "an embodiment" or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrase "in one embodiment", "in an embodiment" and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.
A composition redispersible in polar and non-polar solvents is disclosed. The composition comprises zinc oxide nanoparticles that have a coating of an alkali metal salt of an acid; and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
In accordance with an aspect, the alkali metal salt of an acid is sodium or a potassium salt of an acid. The alkali metal salt of an acid is an alkali metal salt of any one of Ci - C22 carboxylic acid, chloride, nitrate or sulphate. By way of a specific example the alkali metal salt of an acid is sodium acetate, sodium chloride, sodium nitrate or sodium sulphate.
The concentration of the alkali metal salt of an acid in the composition is in a range of 10 to 22 weight percent.
In accordance with an aspect, the ester of carboxylic acid is selected from C4 to C18 ester of carboxylic acid, sodium dioctyl sulfosuccinate and sodium bistridecyl sulfosuccinate. The ester of carboxylic acid coated on the zinc oxide nanoparticles determines the solvent in which the composition is dispersible. Composition wherein the zinc oxide nanoparticles are coated with sodium dioctyl sufosuccinate is redispersible in water. Composition wherein the zinc oxide nanoparticles are coated with sodium bistridecyl sulfosuccinate is redispersible in organic based systems such as resins.
The concentration of ester of carboxylic acid is in a range of 10 to 22 weight percent.
In accordance with an aspect, at least 70 percent of the zinc oxide nanoparticles in the composition have a size in the range of 20 to 200nm. The concentration of zinc oxide nanoparticle in the composition is in a range of 15 to 30 weight percent.
A method for preparing a composition redispersible in polar and non-polar solvents is also disclosed. The method comprises of hydrolyzing a zinc metal precursor dissolved in a solvent to precipitate zinc oxide nanoparticles in dispersion; separating and drying the precipitated zinc oxide nanoparticles to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid. An ester of carboxylic acid is dissolved in toluene to obtain a solution of ester of carboxylic acid. The zinc oxide nanoparticles having a coating of alkali metal salt of an acid is added to the solution of carboxylic acid to obtain a slurry. The slurry is dried to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
The zinc metal precursor may be hydrolyzed by sodium hydroxide or potassium hydroxide.
The zinc metal precursor is selected from any one of zinc acetate, zinc chloride, zinc nitrate and zinc sulphate.
In accordance with an aspect, zinc acetate is dissolved in the solvent N, N dimethyl formamide.
In accordance with an aspect, the ester of carboxylic acid is C4 to C18 ester of carboxylic acid, sodium dioctyl sulfosuccinate or sodium bistridecyl sulfosuccinate.
EXAMPLES
The following example(s) of are exemplary and should not be understood to be in any way limiting.
Example 1: Composition comprising zinc oxide nanoparticles coated with sodium acetate and sodium dioctyl sulfosuccinate is prepared. The concentration of zinc oxide nanoparticles is 27%, sodium acetate is 53 % and sodium dioctyl sulfosuccinate is 20 % in the composition. This composition is used in any aqueous based system for UV blocking and anti-microbial protection.
The particle size distribution of 1% composition was determined. Figure 1 illustrates the particle size distribution of 1 % dispersion of the composition in water.
The zeta-potential of 1% composition was also measured. Figure 2 shows the zeta- potential of the 1 % composition.
The UV-visible spectrum of the composition is measured. Figure 3 shows the UV- Visible Spectrum of the composition.
The anti-bacterial activity of the composition as tested. Tests were carried out at various concentrations from 0.1 % to 1% of composition. Table 1 tabulates the results obtained using 0.3 % composition on various bacteria.
Table 1: Minimum Inhibitory Concentration Data with Input Bacteria Count 106 colony forming units/millilitre (cfu/ml) for composition dosage of 0.3 %
Bacteria Log Reduction after 24 hours
Escherichia coli ATCC 8739 5.25
Staphylococcus aureus ATCC 6538 5.20
Bacillus subtilis ATCC 6633 2.42
Salmonella typhi ATCC 10749 5.21
Klebsiella pneumoniae ATCC 4352 5.27
Pseudomonas aeruginosa ATCC 9027 4.25
Pseudomonas ovate (M. ovate ATCC 46744) 5.19
Streptococcus faecalis ATCC 9790 5.08
Propionibacter acene (Hospital strain) 3.97
Salmonella enteritidia ATCC 13076 2.31
Proteus mirabilis ATCC 14153 0.93
Serratia marcescens MTCC 97 1.82
Pseudomonas aeruginosa ATCC 9027 0.99
Proteus vulgaris ATCC 13315 1.89
Enterobacter cloacae NCIM 2015 0.12
Streptococcus pyogenes (Hospital strain) 1.67
Example 2: Solvent/resin dispersible zinc oxide
Composition comprising zinc oxide nanoparticles coated with sodium acetate and sodium bistridecyl sulfosuccinate is prepared. The concentration of zinc oxide nanoparticles is 28%, sodium acetate is 53% and sodium bistridecyl sulfosuccinate is 20%. This composition is used in an organic based system for UV blocking and anti-microbial protection. The particle size distribution of 4% composition dispersed in xylene was determined. Figure 4 shows the particle size distribution of 4% composition dispersed in xylene. The zeta-potential of the composition is also determined.
The composition is added to polyethylene films and said films are tested for antimicrobial activity. Tables 2 and 3 tabulates the results of the the anti-microbial activity of the composition in polyethylene films.
Table 2: Anti-microbical activity of the composition in polyethylene (PE) film against Staphylococcus aureus ATCC 6538
Test Bacteria : Staphylococcus aureus ATCC 6538
illiiilliii&llll
Sample o. Bacteria on Log of Bacteria Antimicrobial Activity {R} Mlcrobiaf itt
Identification lillllliliiiliil i on treated (Log B-C) (% Reduction) sample
1 ZnO PE 52000 4.71 2.03 99.05
film
0.8 ° - ZnO PE 52000 4.71 2.03 99.05
film
0.6 ZnO PE 47000 4.67 2.07 99.14
film
0.4 °, ZnO PE 72000 4.85 1 .89 98.69
film
Table 3: Anti-microbical activity of the composition in polyethylene (PE) film against Escherichia coli ATCC 9739
Test Bacteria : Escherichia coli ATCC 8739
Example 4. Composition comprising zinc oxide nanoparticles coated with sodium nitrate and sodium dioctyl sulfosuccinate is prepared. The composition comprises 35.80% of zinc oxide nanoparticles, 44.20% sodium nitrate and 20% sodium dioctyl sulfosuccinate. This composition is used in any aqueous based system for UV blocking and anti-microbial protection. The particle size distribution of 1% composition was determined. Figure 6 illustrates the particle size distribution of 1 % dispersion of the composition in water.
Example 5. Composition comprising zinc oxide nanoparticles coated with sodium chloride and sodium bistridecyl sulfosuccinate is prepared. The composition comprises 35.39% of zinc oxide nanoparticles, 44.61% of sodium chloride and 20% of sodium bistridecyl sulfosuccinate. The particle size distribution of 1% composition was determined. Figure 7 illustrates the particle size distribution of 1 % dispersion of the composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/weight water.
Example 6. Composition comprising zinc oxide nanoparticles coated with sodium nitrate and sodium bistridecyl sulfosuccinate is prepared. The composition comprises 40.68% of zinc oxide, 39.32% of sodium nitrate and 20% of sodium bistridecyl sulfosuccinate. Figure 8 illustrates the particle size distribution of 1 % dispersion of the
composition in solvent comprising 70% weight/weight ethylene glycol and 30 % weight/w eight water.
SPECIFIC EMBODIMENTS ARE DESCRIBED BELOW:
A composition redispersible in polar and non-polar solvents comprising zinc oxide nanoparticles having a coating of an alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
Such composition(s), wherein the alkali metal salt of an acid is a sodium or potassium salt of an acid.
Such composition(s), wherein the alkali metal salt of an acid is an alkali metal salt of any one of Ci - C22 carboxylic acid, chloride, nitrate or sulphate.
Such composition(s), wherein the alkali metal salt of an acid is any one of sodium acetate, sodium chloride, sodium nitrate or sodium sulphate.
Such composition(s), wherein the ester of carboxylic acid is C4 to C18 ester of carboxylic acid, sodium dioctyl sulfosuccinate, or sodium bistridecyl sulfosuccinate.
Such composition(s), wherein the concentration of zinc oxide in the composition is in a range of 15 to 30 weight percent.
Such composition(s), wherein the concentration of alkali metal salt of an acid in the composition is 50 to 75 weight percent.
Such composition(s), wherein the concentration of ester of carboxylic acid in the composition is in a range of 10 to 22 weight percent.
Such composition(s), wherein at least 70 percent of zinc oxide nanoparticles have a size in the range of 20 to 200nm.
FURTHER SPECIFIC EMBODIMENTS ARE DESCRIBED BELOW:
A method of preparing a composition redispersible in polar and non-polar solvents comprising hydrolyzing a zinc metal precursor dissolved in a solvent to precipitated zinc oxide nanoparticles in a dispersion, separating and drying the precipitated zinc oxide nanoparticles to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid, dissolving an ester of carboxylic acid in toluene to obtain a solution of the ester of carboxylic acid, adding the zinc oxide nanoparticles having a coating of alkali metal salt of an acid to the solution of ester of carboxylic acid to obtain a slurry, and drying the slurry to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
Such method(s), wherein the zinc metal precursor is any one of zinc acetate, zinc chloride, zinc nitrate or zinc sulphate.
Such method(s), wherein the zinc metal precursor is hydrolysed by sodium hydroxide or potassium hydroxide.
Such method(s), wherein the ester of carboxylic acid is C4 to C18 ester of carboxylic acid, sodium dioctyl sulfosuccinate or sodium bistridecyl sulfosuccinate.
Such method(s), wherein the solvent is N, N dimethyl formamide.
INDUSTRIAL APPLICATION
The composition of zinc oxide nanoparticles as disclosed is redispersible in various solvents such as polar/non-polar aqueous solvents and non-aqueous solvents, polymer and resins etc. As the composition is in a power form it is easy to store and transport. Moreover the process of preparing the composition is also easy to perform and is economical.
Claims
1. A composition redispersible in polar and non-polar solvents comprising :
zinc oxide nanoparticles having a coating of an alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
2. A composition as claimed in claim 1, wherein the alkali metal salt of an acid is a sodium or potassium salt of an acid.
3. A composition as claimed in claim 1 or 2, wherein the alkali metal salt of an acid is an alkali metal salt of any one of Ci - C22 carboxylic acid, chloride, nitrate or sulphate.
4. A composition as claimed in claim 1 or 2, wherein the alkali metal salt of an acid is any one of sodium acetate, sodium chloride, sodium nitrate or sodium sulphate.
5. A composition as claimed in claim 1, wherein the ester of carboxylic acid is C4 to Ci8 ester of carboxylic acid, sodium dioctyl sulfosuccinate, or sodium bistridecyl sulfo succinate.
6. A composition as claimed in claim 1, wherein the concentration of zinc oxide in the composition is in a range of 15 to 30 weight percent.
7. A composition as claimed in claim 1, wherein the concentration of alkali metal salt of an acid in the composition is 50 to 75 weight percent.
8. A composition as claimed in claim 1, wherein the concentration of ester of carboxylic acid in the composition is in a range of 10 to 22 weight percent.
9. A composition as claimed in claim 1, wherein at least 70 percent of zinc oxide nanoparticles have a size in the range of 20 to 200nm.
10. A method of preparing a composition redispersible in polar and non-polar solvents comprising:
hydrolyzing a zinc metal precursor dissolved in a solvent to precipitated zinc oxide nanoparticles in a dispersion;
separating and drying the precipitated zinc oxide nanoparticles to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid;
dissolving an ester of carboxylic acid in toluene to obtain a solution of the ester of carboxylic acid;
adding the zinc oxide nanoparticles having a coating of alkali metal salt of an acid to the solution of ester of carboxylic acid to obtain a slurry; and
drying the slurry to obtain zinc oxide nanoparticles having a coating of alkali metal salt of an acid and an ester of carboxylic acid, such that the alkali metal salt of an acid is coated on the zinc oxide nanoparticles and the ester of carboxylic acid is coated on the alkali metal salt of an acid.
11. A method as claimed in claim 10, wherein the zinc metal precursor is any one of zinc acetate, zinc chloride, zinc nitrate or zinc sulphate.
12. A method as claimed in claim 10, wherein the zinc metal precursor is hydrolysed by sodium hydroxide or potassium hydroxide.
A composition as claimed in claim 10, wherein the ester of carboxylic acid is C4 to Ci8 ester of carboxylic acid, sodium dioctyl sulfo succinate or sodium bistridecyl sulfo succinate.
14. A process as claimed in claim 10, wherein the solvent is N, N dimethyl formamide.
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| WO2025035956A1 (en) * | 2023-08-17 | 2025-02-20 | 清华大学 | Natural material-based janus particles and preparation method therefor |
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