WO2004087577A1 - 表面改質二酸化チタン微粒子とその分散液、およびその製造方法 - Google Patents
表面改質二酸化チタン微粒子とその分散液、およびその製造方法 Download PDFInfo
- Publication number
- WO2004087577A1 WO2004087577A1 PCT/JP2004/004635 JP2004004635W WO2004087577A1 WO 2004087577 A1 WO2004087577 A1 WO 2004087577A1 JP 2004004635 W JP2004004635 W JP 2004004635W WO 2004087577 A1 WO2004087577 A1 WO 2004087577A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- titanium dioxide
- fine particles
- modified titanium
- dioxide fine
- modified
- Prior art date
Links
- 239000010419 fine particle Substances 0.000 title claims abstract description 143
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000006185 dispersion Substances 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 405
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 189
- 239000002245 particle Substances 0.000 claims abstract description 64
- 229920001477 hydrophilic polymer Polymers 0.000 claims abstract description 33
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 21
- 239000003125 aqueous solvent Substances 0.000 claims abstract description 19
- 229920003169 water-soluble polymer Polymers 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 78
- 239000000243 solution Substances 0.000 claims description 63
- 238000006243 chemical reaction Methods 0.000 claims description 39
- 239000000203 mixture Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 22
- 239000002904 solvent Substances 0.000 claims description 17
- 238000001556 precipitation Methods 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 11
- 206010028980 Neoplasm Diseases 0.000 claims description 9
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- 239000000696 magnetic material Substances 0.000 claims description 9
- 239000003960 organic solvent Substances 0.000 claims description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
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- 239000006174 pH buffer Substances 0.000 claims description 4
- 238000005185 salting out Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 3
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
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- 238000001035 drying Methods 0.000 claims 1
- 150000002433 hydrophilic molecules Chemical class 0.000 claims 1
- 238000001155 isoelectric focusing Methods 0.000 claims 1
- 239000002808 molecular sieve Substances 0.000 claims 1
- 238000001126 phototherapy Methods 0.000 claims 1
- 239000002504 physiological saline solution Substances 0.000 claims 1
- 239000012744 reinforcing agent Substances 0.000 claims 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 abstract description 12
- 239000011369 resultant mixture Substances 0.000 abstract 1
- 229920002125 Sokalan® Polymers 0.000 description 96
- 239000004584 polyacrylic acid Substances 0.000 description 94
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- 239000007864 aqueous solution Substances 0.000 description 23
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 22
- 239000007787 solid Substances 0.000 description 20
- 239000000126 substance Substances 0.000 description 17
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 11
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 7
- 230000001699 photocatalysis Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- 239000002612 dispersion medium Substances 0.000 description 6
- 238000001027 hydrothermal synthesis Methods 0.000 description 6
- 229910017604 nitric acid Inorganic materials 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000005119 centrifugation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000009210 therapy by ultrasound Methods 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000009739 binding Methods 0.000 description 4
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 239000012085 test solution Substances 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 3
- 230000000844 anti-bacterial effect Effects 0.000 description 3
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- 238000000108 ultra-filtration Methods 0.000 description 3
- 239000012498 ultrapure water Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229920005654 Sephadex Polymers 0.000 description 2
- 239000012507 Sephadex™ Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- XQAXGZLFSSPBMK-UHFFFAOYSA-M [7-(dimethylamino)phenothiazin-3-ylidene]-dimethylazanium;chloride;trihydrate Chemical compound O.O.O.[Cl-].C1=CC(=[N+](C)C)C=C2SC3=CC(N(C)C)=CC=C3N=C21 XQAXGZLFSSPBMK-UHFFFAOYSA-M 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
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- HGCIXCUEYOPUTN-UHFFFAOYSA-N cyclohexene Chemical compound C1CCC=CC1 HGCIXCUEYOPUTN-UHFFFAOYSA-N 0.000 description 2
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- 238000000527 sonication Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 2
- -1 titanium alkoxide Chemical class 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- FDCJDKXCCYFOCV-UHFFFAOYSA-N 1-hexadecoxyhexadecane Chemical compound CCCCCCCCCCCCCCCCOCCCCCCCCCCCCCCCC FDCJDKXCCYFOCV-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920002307 Dextran Polymers 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- 239000006173 Good's buffer Substances 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000006142 Luria-Bertani Agar Substances 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 101100258086 Postia placenta (strain ATCC 44394 / Madison 698-R) STS-01 gene Proteins 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
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- 229920002472 Starch Polymers 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
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- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
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- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
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- 239000010931 gold Substances 0.000 description 1
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- 239000006166 lysate Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000004962 physiological condition Effects 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001444 polymaleic acid Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002468 redox effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 210000002966 serum Anatomy 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- BUUPQKDIAURBJP-UHFFFAOYSA-N sulfinic acid Chemical compound OS=O BUUPQKDIAURBJP-UHFFFAOYSA-N 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K33/00—Medicinal preparations containing inorganic active ingredients
- A61K33/24—Heavy metals; Compounds thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K41/00—Medicinal preparations obtained by treating materials with wave energy or particle radiation ; Therapies using these preparations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P31/04—Antibacterial agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- 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
- C09C1/0081—Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- C02F2305/10—Photocatalysts
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Definitions
- the present invention provides surface-modified titanium dioxide fine particles in which the surface of titanium dioxide is modified with a hydrophilic polymer having a carboxyl group, wherein the carboxyl group of the hydrophilic polymer and titanium dioxide are bonded by an ester bond.
- the present invention relates to a surface-modified titanium dioxide fine particle, a dispersion thereof, and a method for producing the same. Background art
- the isoelectric point of titanium dioxide is said to be around pH 6, so that titanium dioxide particles aggregate in an aqueous solvent near neutrality, making it extremely difficult to disperse them uniformly. . Therefore, various attempts have been made to date to uniformly disperse the titanium dioxide particles in an aqueous dispersion medium.
- a nitric acid-oxidized titanium dioxide sol has been proposed in which a precipitate of titanium hydroxide is formed from titanium isopropoxide and peptized at high temperature under nitric acidity (eg, Chr i stophe, Barbeb: Journal).
- H10-667516 by dispersing and stabilizing the titanium dioxide particles under a strong force by coating the surface of the particles with a porous silicon force.
- a method for obtaining a dispersion of composite titanium dioxide fine particles for example, see Japanese Patent Application Laid-Open No. 11-13977
- a method for improving dispersibility by containing a polycarboxylic acid or a salt thereof as a dispersant for example, a method of obtaining an aqueous solution of titanium dioxide (see, for example, Japanese Patent Application Laid-Open No. H02-212123) has been proposed.
- particles in which a magnetic material and titanium dioxide are combined have been proposed.
- particles having a surface coated with titanium alkoxide dissolved in an organic solvent using iron powder as a carrier see, for example, Japanese Patent Application Laid-Open No. H09-29980
- iron oxide / silicone carrier Preparation of magnetic material and titanium dioxide composite particles by directly depositing amorphous or crystalline titanium dioxide by high temperature treatment (eg. Watson, Beydoun et al .: Journal of Photochemistry and Photobio Iogy A: Chemistry, 148, 303-313 (2002)).
- the dispersant may be decomposed by the activity of the photocatalyst, and on the contrary, the activity of the photocatalyst may decrease.
- problems such as aggregation and precipitation. Similar phenomena also occurred in composite particles with the above-mentioned magnetic material in which titanium dioxide was present on a part of the surface, and reagglomeration and sedimentation had become a problem.
- titanium dioxide having a strong photoactivity resolution to a drug delivery system (DDS)
- DDS drug delivery system
- metal particles such as gold carrying titanium dioxide are shot into target cancer cells and taken in, and then irradiated with light such as ultraviolet rays to kill the cancer cells.
- light such as ultraviolet rays to kill the cancer cells.
- the activation of titanium dioxide can be controlled by turning light on and off, so its application to DDS for cancer treatment and the like is expected.
- titanium dioxide is around pH 6 as described above. Under physiological conditions near neutrality, titanium dioxide particles still have a problem. For this reason, it has not been possible to directly administer the titanium dioxide dispersion as an injection solution into a blood vessel or use titanium dioxide particles as they are as a carrier for DDS. Disclosure of the invention
- the present inventors have conducted intensive studies in order to solve the above-mentioned problems, and chemically modified a hydrophilic polymer on the surface of titanium dioxide fine particles to modify the surface.
- the present inventors have found that the dispersibility in an aqueous solvent is extremely good even in the H region, and have completed the present invention. That is, the surface-modified titanium dioxide fine particles of the present invention have a hydrophilic polymer through an ester bond on the surface thereof, and are extremely good even in an aqueous solvent having a wide pH range as well as near neutrality. It shows excellent dispersibility.
- a dispersion of surface-modified titanium dioxide particles utilizing this characteristic can be used as a solvent with various pH buffers containing water or salt, and is a stable dispersion having extremely good dispersibility.
- the method for producing the surface-modified titanium dioxide fine particles of the present invention comprises mixing a titanium dioxide particle dispersion of 2 to 200 nm and a water-soluble polymer solution. The mixture is heated at 80 to 220 ° C. It is characterized by purifying surface-modified titanium dioxide particles by removing unbound water-soluble polymers after ester-bonding both.
- the resulting surface-modified titanium dioxide fine particles of the present invention can be dispersed in an aqueous solvent not only neutral but also in a wide pH range, and are extremely stable against pH fluctuation and salt addition. It is.
- it is easy to form a composite with other functional substances it is effective for producing particles having a new function.
- the surface-modified titanium dioxide fine particles of the present invention are directly introduced into a lesion in the body and irradiated with light such as ultraviolet rays, so that cancer tissue and the like can be efficiently destroyed because aggregation does not occur.
- various organic substances and microorganisms can be decomposed by irradiating ultraviolet rays or sunlight to induce a redox effect of the photocatalytic ability.
- FIG. 1 is a schematic view showing the surface-modified titanium dioxide fine particles of the present invention.
- FIG. 2 shows the photocatalytic activity of the surface-modified titanium dioxide fine particles of the present invention (methylenebutane).
- FIG. 6 is a diagram showing the results of measurement of the absorbance due to the decomposition of roux (displayed as a decrease in absorbance).
- ⁇ , ⁇ , ⁇ , ⁇ , and ⁇ represent the polyacrylic acid-bound titanium dioxide fine particles (anatase type) prepared in Examples 1 to 5, respectively.
- FIG. 3 is a graph showing the cell killing of cancer cells by the photocatalytic activity of the surface-modified titanium dioxide particles of the present invention.
- FIG. 1 is a schematic view showing the surface-modified titanium dioxide fine particles of the present invention.
- the surface-modified titanium dioxide fine particles 1 of the present invention have a hydrophilic polymer 2 on the surface of titanium dioxide fine particles, and the carboxyl group of the hydrophilic polymer 2 and titanium dioxide are bonded by an ester bond. It is assumed that. In other words, the titanium dioxide on the surface of the titanium dioxide fine particles 1 is hydrated by water in the reaction system to form hydroxyl groups, and the hydroxyl groups react with the carboxyl groups of the hydrophilic polymer to form ester bonds.
- Ru can be applied various analytical methods, for example by infrared spectroscopy in the presence or absence of the infrared absorption of 1 7 0 0 ⁇ 1 8 0 0 cm _ 1 near the absorption bands of the ester bond It is possible to confirm.
- the isoelectric point of the surface-modified titanium dioxide particles becomes close to the isoelectric point (pH 2.8 to 2.9) of the carboxyl residue of the hydrophilic polymer, Even in a solvent, an electric repulsion acts between the particles, so that the particles exhibit good dispersibility.
- the titanium dioxide particles used in the present invention may have an anadase type or a rutile type crystal system. This is because even if the crystal systems are different, the surface modification is possible if the chemical properties of hydration and generation of hydroxyl groups are the same. If a strong photocatalytic activity is desired, the anatase type can be suitably selected, and if a property such as a high refractive index such as a cosmetic is desired, the rutile type can be suitably selected. For the same reason, not only single titanium dioxide particles but also composite titanium dioxide particles composed of titanium dioxide and a magnetic material are preferably used. Further, from the viewpoint of the degree of freedom of the form of use, it is desirable that these dispersed particle diameters are 2 to 200 nm. This is because when the particle size is larger than 200 n, the effect of the gravity acting on the fine particles increases, and the particles are more likely to settle.
- the surface-modified titanium dioxide fine particles of the present invention are characterized in that the hydrophilic polymer is a water-soluble high molecule.
- the hydrophilic polymer is a water-soluble high molecule.
- a water-soluble polymer is preferable as the hydrophilic polymer used in the present invention. That's why.
- Any water-soluble polymer having a plurality of carboxyl groups can be used.Examples include carboxymethyl starch, carboxymethyl dextran, carboxymethyl cellulose, polycarboxylic acids, and copolymers having a carboxyl group unit. (Copolymer) and the like.
- a copolymer of polycarboxylic acids such as polyacrylic acid and polymaleic acid
- a copolymer of acrylic acid / maleic acid / acrylic acid / nosulfonate monomer Is more preferably used.
- the dispersion liquid of the surface-modified titanium dioxide particles of the present invention is characterized in that the surface-modified titanium dioxide particles are dispersed in an aqueous solvent. This is because, in an aqueous dispersion medium, the protons of the carboxyl residues present on the surface of the surface-modified titanium dioxide fine particles are in a dissociated state. By being stable for a long time without doing Moreover, it is basically extremely stable against pH fluctuation and addition of inorganic salts. Further, the isoelectric point of the surface-modified titanium dioxide fine particles of the present invention is determined by the carboxyl residue of the hydrophilic polymer. Is near the isoelectric point (PH 2.8 to 2.9).
- Suitable buffers that can be used here include glycine buffer, acetate buffer, phosphate buffer (including PBS), carbonate buffer, pine quinbaine buffer, good buffer, boric acid. Buffers and the like can be mentioned. The ability to use near neutral buffers is extremely advantageous for applications in the biotechnology and pharmaceutical and medical fields.
- the carboxyl group / titanium dioxide content ratio (m 0 I / g) of the surface-modified titanium dioxide fine particles in the dispersion varies depending on the reaction conditions, but is generally about 2 ⁇ 1 0 3 or more at which the is not preferable.
- the method for producing surface-modified titanium dioxide fine particles of the present invention comprises: (1) a step of dispersing a titanium dioxide sol in a solvent in a reaction of binding a hydrophilic polymer to the surface of titanium dioxide fine particles; (3) a step of mixing these dispersions, (4) a step of heating this mixture, and (5) a step of dissolving the surface-modified titanium dioxide fine particles. It is characterized by comprising a step of separating the hydrophilic polymer and a step of purifying the surface-modified titanium dioxide fine particles.
- the solvent used in (1) and (2) is preferably a solvent that can dissolve both the titanium dioxide sol and the hydrophilic polymer. This is because, when titanium dioxide aggregates in a solvent, the surface area where a binding reaction with a hydrophilic polymer can occur is reduced, so that the dispersion particle diameter in an aqueous solvent after the reaction is increased and the dispersibility is also deteriorated. is there. Further, a solvent having reactivity with the surface of the titanium dioxide particles is not suitable as the solvent used here.
- alcohols containing a hydroxyl group form an ether bond with the surface of the titanium dioxide particles when heated, and thus inhibit the bonding reaction with the desired hydrophilic polymer.
- the surface characteristics of the titanium dioxide particles depend on the characteristics of the alcohol used, and the dispersibility of the titanium dioxide particles in an aqueous dispersion medium is significantly reduced.
- the solvent used in the present invention is preferably a non-protonic polar solvent such as dimethylformamide, dioxane, or dimethylsulfoxide from the above-mentioned reactivity point of view, but from the viewpoint of the volatility of the solvent. More preferably, dimethylformamide is used.
- a titanium dioxide dispersion of the solvent and a hydrophilic polymer dispersion are mixed and stirred to prepare a dispersion in which titanium dioxide and the hydrophilic polymer are uniformly dispersed.
- a hydrophilic polymer is directly added to the titanium dioxide dispersion, aggregation of the titanium dioxide may be caused. Therefore, it is preferable that each dispersion is prepared and then mixed.
- the mixed solution is heated to perform a binding reaction.
- the reaction proceeds without applying pressure.
- polyacrylic acid plain
- the final concentration of polyacrylic acid is preferably set to 0.4 mg ZmI or more in order to improve the dispersibility.
- the heating temperature is 80 to 220 ° C.
- the heating temperature is 80 ° less than a C dispersibility in an aqueous solvent bonding of the hydrophilic polymer is lowered is lowered.
- the reaction is performed under pressure, if the heating temperature exceeds 220 ° C., it is unsuitable due to the problem of the tightness of the reaction vessel.
- the reaction proceeds at a temperature equal to or higher than the boiling point of water, the titanium dioxide aggregates when the water contained in the titanium dioxide sol is completely volatilized out of the reaction system. Is desirable.
- the water content in the reaction solution is too high, the reaction may be adversely affected. Therefore, the water content in the reaction solution depends on the reaction conditions, but is preferably approximately 4% or less.
- the generated surface-modified titanium dioxide fine particles and the unbound hydrophilic polymer are separated.
- a dialysis method, an ultrafiltration method, a gel filtration chromatography method, a precipitation method, or the like can be suitably used, but when the separation is performed by a dialysis method or an ultrafiltration method, the hydrophilicity used is high. It is necessary to use a dialysis or ultrafiltration membrane that matches the molecular weight of the molecule. That is, although separation can be performed by any of the above methods, it is desirable to use a precipitation method because of the simplicity of the operation.
- the precipitation method includes a method using an isoelectric point and a method using salting out. Any of them can be suitably used.
- the reaction solvent is removed under reduced pressure in an evaporator, water is added, and the mixture is stirred to disperse the surface-modified titanium dioxide fine particles.
- an inorganic acid is added to the dispersion to lower the pH of the dispersion to 2.8 or less.
- the surface-modified titanium dioxide loses negative charges on the surface and agglomerates.
- the hydrophilic polymer that is not bonded to the particles remains in the dispersion without aggregating. It is possible to remove unbound hydrophilic polymer with care.
- the reaction solution is collected in a separating funnel after completion of the reaction.
- An organic solvent which separates with water is added, followed by stirring and mixing.
- the aqueous layer contains the surface-modified titanium dioxide
- the organic solvent layer contains the non-protonic organic solvent used in the reaction.
- the precipitated surface-modified titanium dioxide fine particles are washed with water, and then the surface-modified titanium dioxide fine particles are dissolved in an aqueous solvent having a pH of 3 to 13, preferably pH 5 to 12. Suspend.
- an aqueous solvent having a pH of 3 to 13, preferably pH 5 to 12.
- water, a desired pH buffer, or an alkaline aqueous solution can be suitably used.
- the surface-modified titanium dioxide fine particles are uniformly dispersed by stirring or ultrasonic irradiation of this suspension, and then dried after desalting to obtain a dry powder of the surface-modified fine titanium dioxide particles.
- the ability to produce stable powders that are easy to handle is extremely advantageous when applying surface-modified titanium dioxide fine particles to various uses.
- composite titanium dioxide fine particles composed of titanium dioxide and a magnetic material
- the characteristics in a solvent are similar to a single titanium dioxide.
- the same production method and purification method as described above can be applied. Since the surface-modified composite titanium dioxide fine particles have magnetism, they are extremely useful because they can be easily recovered by a magnet after the treatment, for example, when applied to the decomposition treatment of harmful substances in water.
- This dispersion was placed in a 100-ml vial, and sonicated at 200 Hz for 30 minutes.
- the average dispersed particle diameters before and after the ultrasonic treatment were 36.4 nm and 20.2 nm, respectively.
- the solution was concentrated to prepare a titanium dioxide sol having a solid component of 20%.
- the resulting titanium dioxide sol, 0-75 mI was dispersed in 20 mI of dimethylformamide (DMF), and polyacrylic acid (average molecular weight: 500,000, Wako Pure Chemical Industries) 0.3 After adding 10 ml of DMF in which g was dissolved, the mixture was stirred and mixed.
- DMF dimethylformamide
- polyacrylic acid average molecular weight: 500,000, Wako Pure Chemical Industries
- the solution was transferred to a hydrothermal reaction vessel (HU-50, San-ai Science), and synthesis was performed at 180 ° C for 6 hours. After the completion of the reaction, the reaction vessel was cooled to a temperature of 50 ° C. or less, and after taking out the solution, 120 ml of water was added and mixed with stirring. After removing DMF and water by evaporation, 20 ml of water was added again to obtain a polyacrylic acid-bound titanium dioxide aqueous solution. Unreacted polyacrylic acid was separated by adding 1 ml of 2N hydrochloric acid to precipitate polyacrylic acid-bound titanium dioxide fine particles and removing the supernatant after centrifugation.
- a hydrothermal reaction vessel HU-50, San-ai Science
- Polyacrylic acid-bonded titanium dioxide fine particles were produced in exactly the same manner as in Example 1, except that STS-01 of nitric acid anatase sol (Ishihara Industrial Co., Ltd., solid content: 20%) was used as the titanium dioxide sol.
- STS-01 of nitric acid anatase sol Ishihara Industrial Co., Ltd., solid content: 20%
- the dispersion particle diameter of the prepared polyacrylic acid-bound titanium dioxide fine particles was measured and found to be 66.6 nm.
- the obtained aqueous solution of polyacrylic acid-bound titanium dioxide was desalted with a desalting column PD 10 and then dried at 100 ° C. to obtain polyacrylic acid-bound titanium dioxide fine particles (anatase type).
- polyacrylic acid-bound titanium dioxide fine particles were synthesized in exactly the same manner as in Example 2 to obtain an aqueous solution of polyacrylic acid-bound titanium dioxide having a solid content of 1.5%. .
- the dispersion particle size of the prepared polyacrylic acid-bonded titanium dioxide fine particles was measured and found to be 66. 6 nm.
- the obtained aqueous solution of polyacrylic acid-bound titanium dioxide is desalted with a desalting column PD 10 and then dried at 100 ° C. to obtain polyacrylic acid-bound titanium dioxide fine particles (Anarose type). Got.
- Polyacrylic acid-bonded titanium dioxide fine particles were synthesized in exactly the same manner as in Example 2 except that the synthesis temperature was set to 130 ° C., to obtain an aqueous solution of polyacrylic acid-bonded titanium dioxide having a solid content of 5.5%. .
- the dispersion particle size of the prepared polyacrylic acid-bonded titanium dioxide fine particles was measured to be 67.4 nm.
- the obtained aqueous solution of polyacrylic acid-bound titanium dioxide was desalted with a desalting column PD 10 and dried at 100 ° C. to obtain polyacrylic acid-bound titanium dioxide fine particles (anatase type).
- Polyacrylic acid-bonded titanium dioxide fine particles were synthesized in exactly the same manner as in Example 2 except that the synthesis temperature was set to 80 ° C., to obtain a 1.5% solid component aqueous solution of polyacrylic acid-bound titanium dioxide.
- the dispersion particle size of the prepared polyacrylic acid-bonded titanium dioxide fine particles was measured to be 67.9 nm.
- the obtained aqueous solution of polyacrylic acid-bound titanium dioxide was desalted with a desalting column PD 10 and dried at 100 ° C. to obtain polyacrylic acid-bound titanium dioxide fine particles (anatase type).
- a mixture of 3.6 g of titanium tetraisopropoxide and 3.6 g of isopropanol was added dropwise to 60 ml of ultrapure water under ice cooling to carry out hydrolysis. After the dropwise addition, the mixture was stirred at room temperature for 30 minutes. After stirring, 12 ml of 1N nitric acid was added dropwise at 80 ° C for 8 hours. The mixture was stirred for a while, and the mixture was subjected to a petition. After completion of the filtration, the solution was filtered through a 0.45 m filter, and the solution was exchanged using a desalting column PD10 to prepare a titanium dioxide sol having a solid content of 1%.
- This dispersion was placed in a 100 ml vial and sonicated at 200 Hz for 30 minutes.
- the average dispersed particle diameters before and after sonication were 36.4 nm and 20.2 nm, respectively.
- the solution was concentrated to prepare a titanium dioxide sol having a solid component of 20%. 0.75 mI of the obtained titanium dioxide sol is dispersed in 20 mI of dimethylformamide (DMF), and 0.3 g of polyacrylic acid (average molecular weight: 500, Wako Pure Chemical Industries) is dissolved. After adding 10 mI of DMF, the mixture was stirred and mixed.
- DMF dimethylformamide
- polyacrylic acid average molecular weight: 500, Wako Pure Chemical Industries
- the solution was transferred to a hydrothermal reactor (HU-50, San-ai Science), and synthesis was performed at 180 ° C for 6 hours. After the completion of the reaction, the reaction vessel was cooled to a temperature of 50 ° C. or lower, and the solution was taken out into a separating funnel. Next, 40 ml of porcine mouth was added, and the mixture was stirred and mixed. Then, the lower layer was removed, and the upper layer was recovered. This step was repeated twice to remove DMF. To 10 ml of this solution was added 10 ml of 1.5 M NaCI and 20% (w / v) polyethylene glycol 600 (Wako Pure Chemical Industries, Ltd.). Removed.
- This dispersion was placed in a 100 ml vial and sonicated at 200 Hz for 30 minutes.
- the average dispersed particle diameters before and after sonication were 36.4 nm and 20.2 nm, respectively.
- the solution was concentrated to prepare a titanium dioxide sol having a solid component of 20%. 0.75 mI of the obtained titanium dioxide sol was dispersed in 20 mI of dimethylformamide (DMF), and 0.3 g of polyacrylic acid (average molecular weight: 500, Wako Pure Chemical Industries) was dissolved. After adding 10 mI of DMF, the mixture was stirred and mixed.
- DMF dimethylformamide
- the solution was transferred to a hydrothermal reactor (HU-50, San-ai Science), and synthesis was performed at 150 ° C for 5 hours. After the completion of the reaction, the reaction solution was cooled until the temperature of the reaction vessel became 50 ° C or less. To the reaction solution, twice the amount of isopropanol (Wako Pure Chemical Industries) was added. After standing at room temperature for 30 minutes, the precipitate was recovered by centrifugation. After the collected precipitate was was washed with 70% ethanol, 2.5 ml of water was added to obtain a dispersion of polyacrylic acid-bound titanium dioxide fine particles (anatase type).
- Polyacrylic acid-bonded titanium dioxide fine particles were synthesized in exactly the same manner as in Example 7, except that polyacrylic acids having average molecular weights of 2000 and 350 were used. Even when polyacrylic acids having average molecular weights of 2000 and 350 were used, the dispersions of the polyacrylic acid-bound titanium dioxide fine particles (anatase type) were both favorable and showed good dispersibility.
- titanium tetraisopropoxide (Wako Pure Chemical Industries) was added to a final concentration of 5 mM.
- the aqueous solution was centrifuged and the precipitate was calcined at 350 ° C for 2 hours. After firing, the mixture was dispersed in a 1 OmM aqueous solution of nitric acid, sonicated, and filtered through a 0.1 / Im filter.
- Example 7 0.75 ml of a 20% titanium dioxide sol having a solid content obtained in the process of Example 7 was dispersed in 1 O ml of DMF, and different weights of polyacrylic acid (average molecular weight: 500,000 After adding 5 ml of a DMF solution containing (Koujunyaku), the mixture was stirred and mixed. The solution was transferred to a hydrothermal reaction vessel (HU-50, San-ai Science), and synthesis was performed at 150 ° C for 5 hours. After completion of the reaction, the properties of each solution were observed However, when the final concentration of polyacrylic acid was 0.4 mgZml or more, a dispersion of well-dispersed polyacrylic acid-bound titanium dioxide fine particles was obtained.
- the concentration of polyacrylic acid was lower than this, the dispersion was opaque but opaque and the particle size was large. Therefore, it was found that under the above reaction conditions, the final concentration of polyacrylic acid was required to be 0.4 mg / mI or more.
- the water content during the reaction is preferably 4% or less as the final concentration.
- a solution (A) of 1 g of polyacrylic acid dissolved in 1 O ml of DMF was used. Titanium dioxide sol with a solid content of 20% obtained in the process of Example 7. A solution in which 25 ml was dispersed in 1 O ml of DMF was used as a solution (B). Further, 0.25 mI of a 20% solid component titanium dioxide sol obtained in the process of Example 7 and 1 g of 20% (w / V) polyacrylic acid were dispersed in 1 OmI DMF. This was used as a solution (C). Furthermore, a dispersion of polyacrylic acid-bound titanium dioxide fine particles obtained by reacting the solution (C) at 150 ° C.
- solution (D) since the surface of titanium dioxide is modified with numerous carboxyl residues, the isoelectric point of the whole fine particles is around pH 2.8, and they are uniformly dispersed even in a neutral solution. The state is kept. That is, from the results of Examples 13 and 14 in the comparison between the solutions (C) and (D), the polyacrylic acid-bonded silicon dioxide fine particles were in a state where the dispersibility was simply increased by the addition of polyacrylic acid. It was found that the titanium dioxide particles showed completely different physical properties.
- the polyacrylic acid-bound titanium dioxide fine particles obtained in Examples 1 to 7 were dispersed in water, and the pH of the solution was changed from pH 3 to pH 13 in steps of pH 1 using hydrochloric acid and sodium hydroxide. Then, it was observed whether aggregation or precipitation of the polyacrylic acid titanium dioxide fine particles occurred.
- the aqueous solution with the changed pH was centrifuged at 400 rpm to confirm the presence or absence of aggregation, but no aggregation or precipitation of each particle was observed at any pH.
- FT-IR Infrared spectroscopy
- Example 7 The polyacrylic acid-bound titanium dioxide fine particle dispersion obtained in Example 7 was heated and dried at 110 ° C. for 1 hour, and then slightly more than 4 hours. Heated to complete incineration. This was cooled in a silica gel desiccator, and the mass was measured as the net amount of titanium dioxide in the dispersion. The results indicated that the dispersion contained 8.82% (w / V) titanium dioxide.
- the polyacrylic acid-bound titanium dioxide fine particles (anatase type) obtained in Examples 1 to 5 were mixed with 50 mM phosphate buffer (pH 7.0) so that the solid content was 0.02%. Diluted. Methylene blue trihydrate (Wako Pure Chemical Industries) was added to the aqueous solution to a concentration of 40M. While stirring, this aqueous solution was irradiated with ultraviolet light having a wavelength of 340 nm to 1.5 mW / cm 2, and the absorption at a wavelength of 580 nm was measured with an ultraviolet-visible light spectrophotometer. . The results are shown in FIG.
- the polyacrylic acid-bound titanium dioxide fine particles (anatase type) obtained in Example 1 were adjusted with 50 mM phosphate buffer (pH 7.0) so that the solid content was 1.0%. After inoculating Escherichia coli and culturing overnight at 37 ° C in B broth, the culture is centrifuged, and the cells are washed with 50 mM phosphate buffer (pH 7.0). The suspension was suspended in an amount of 50 mM phosphate buffer (pH 7.0). This was further diluted 100-fold with a 50-m phosphate buffer (pH 7.0) and used as the test bacterial solution. ⁇ The polyacrylic acid-bound titanium dioxide fine particles were added to the test bacterial solution at the final concentration.
- test solution Place a mixture of the test bacterial solution and polyacrylic acid-bound titanium dioxide fine particles in a small petri dish to a depth of 3 mm. The plate was allowed to stand at room temperature under black light irradiation (dose: 900 / W / cm 2 ). In addition, a sample to which no polyacrylic acid-bound titanium dioxide fine particles were added was irradiated with black light similarly as Control 1. A part of the test solution was collected before irradiation, 2 hours after irradiation, and 4 hours after irradiation, and the number of bacteria was counted according to a conventional method using LB agar medium.
- the polyacrylic acid-bound titanium dioxide fine particles (anatase type) obtained in Example 1 were adjusted with a PBS buffer (pH 6.8) so that the solid content was 1.0%.
- Two types of cultured cancer cells (Raj ⁇ , Jurkat) were cultured in RPMI 1640 medium (manufactured by GIBCO) containing 10% serum at 37 ° C and 5% carbon dioxide atmosphere. 5. to prepare a cell solution of 8 X 1 0 5. This was cultured again under the same conditions for 20 hours to obtain a test cell solution.
- the above polyacrylic acid-bound titanium dioxide fine particle dispersion was added to a final concentration of 0.1%. And used as a test solution.
- test solution was poured into a small petri dish so as to have a liquid depth of 3 mm, and allowed to stand at room temperature under irradiation with black light (UV) (dose: 900 W / cm 2 ).
- UV black light
- blanks (untreated) that did not add polyacrylic acid-bound titanium dioxide fine particles and did not irradiate UV, those that did not irradiate UV after adding polyacrylic acid-bound titanium dioxide fine particles, and those that did not irradiate UV The test was performed at the same time, with the control simply irradiated with UV light without adding fine particles. Six hours later, each test solution was collected, and the number of each cell was counted.
- Figure 3 shows the results. In the system where polyacrylic acid-bound titanium dioxide particles were added and the cells were irradiated with UV light, the number of cells decreased drastically, indicating that the polyacrylic acid-bound titanium dioxide particles have cell killing properties against cancer cells. Admitted. Industrial applicability
- surface-modified titanium dioxide fine particles having excellent dispersibility in a neutral aqueous solvent suitable for various applications, and having long-term stable dispersibility even in a wide pH range, and a dispersion thereof, And a method for manufacturing the same.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/551,071 US20060264520A1 (en) | 2003-03-31 | 2004-03-31 | Surface-modified titanium dioxide fine particles and dispersion comprising the same, and method for producing the same |
EP04724741A EP1630136B1 (en) | 2003-03-31 | 2004-03-31 | Surface-modified titanium dioxide fine particles and dispersion comprising the same, and method for producing the same |
AU2004226052A AU2004226052B2 (en) | 2003-03-31 | 2004-03-31 | Surface-modified titanium dioxide fine particles and dispersion comprising the same, and method for producing the same |
JP2005504273A JP3775432B2 (ja) | 2003-03-31 | 2004-03-31 | 表面改質二酸化チタン微粒子とその分散液、およびその製造方法 |
Applications Claiming Priority (4)
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JP2003-94430 | 2003-03-31 | ||
JP2003094430 | 2003-03-31 | ||
JP2003-340228 | 2003-09-30 | ||
JP2003340228 | 2003-09-30 |
Publications (1)
Publication Number | Publication Date |
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WO2004087577A1 true WO2004087577A1 (ja) | 2004-10-14 |
Family
ID=33134317
Family Applications (1)
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PCT/JP2004/004635 WO2004087577A1 (ja) | 2003-03-31 | 2004-03-31 | 表面改質二酸化チタン微粒子とその分散液、およびその製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060264520A1 (ja) |
EP (1) | EP1630136B1 (ja) |
JP (1) | JP3775432B2 (ja) |
AU (1) | AU2004226052B2 (ja) |
WO (1) | WO2004087577A1 (ja) |
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- 2004-03-31 JP JP2005504273A patent/JP3775432B2/ja not_active Expired - Fee Related
- 2004-03-31 AU AU2004226052A patent/AU2004226052B2/en not_active Expired - Fee Related
- 2004-03-31 EP EP04724741A patent/EP1630136B1/en not_active Expired - Lifetime
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US9440221B2 (en) | 2013-03-15 | 2016-09-13 | Daicel Corporation | Titanium oxide dispersion liquid, titanium oxide coating liquid, and photocatalyst coating film |
JPWO2014141992A1 (ja) * | 2013-03-15 | 2017-02-16 | 株式会社ダイセル | 酸化チタン分散液、酸化チタン塗布液、及び光触媒塗膜 |
WO2014148949A1 (ru) | 2013-03-22 | 2014-09-25 | Асави, Ллс | Алкил 2-{[(2r,3s,5r)-5-(4-амино-2-оксо-2н-пиримидин-1-ил)-3-гидрокси-тетрагидро-фуран-2-илметокси]-фенокси-фосфориламино}-пропионаты, нуклеозидные ингибиторы рнк-полимеразы hcv ns5b, способы их получения и применения |
Also Published As
Publication number | Publication date |
---|---|
AU2004226052A1 (en) | 2004-10-14 |
JPWO2004087577A1 (ja) | 2006-06-29 |
JP3775432B2 (ja) | 2006-05-17 |
US20060264520A1 (en) | 2006-11-23 |
EP1630136A4 (en) | 2009-01-21 |
EP1630136A1 (en) | 2006-03-01 |
EP1630136B1 (en) | 2012-07-11 |
AU2004226052B2 (en) | 2009-06-11 |
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