2007 Fiscal Year Final Research Report Summary
Preparation of Long Persistence Phospher/Visible-light Photocatalyst Composite and their Application to Environment Friendly Colored Materials.
| Project/Area Number |
17350095
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Organic industrial materials
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| Research Institution | Kumamoto Industrial Research Institute |
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Principal Investigator |
NAGAOKA Shoji Kumamoto Industrial Research Institute, Kumamoto Industrial Research Institute, Materials Development Department, Senior Scientist (10227994)
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| Co-Investigator(Kenkyū-buntansha) |
IHARA Hirotaka Kumamoto University, Applied Chemistry and Biochemistry, Professor (10151648)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Photocatalyst / Cellulose / Pigment / Particle / Titanium Dioxide / Color Material |
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| Research Abstract |
(1) Cellulose/TiO_2 hybrid spherical microbeads were prepared by a one-step phase separation method using a cellulose xanthate aqueous solution and a sodium polyacrylate aqueous solution. Various types of cellulose/TiO_2 hybrid spherical microbeads were obtained by using the several kinds of TiO_2 particles. The resulting hybrid spherical microbeads showed respective differences in the distribution of TiO_2 particles. EPMA observation of the surface of hybrid spherical microbead clearly showed where the TiO_2 particles were distributed. In addition, the extent of coverage by TiO_2 particles of the surface was also confirmed by external appearance, because the surface of cellulose/TiO_2 hybrid spherical microbeads on which there were relatively few TiO_2 particles appeared dark yellow. In contrast, the cellulose/TiO_2 hybrid spherical microbeads on which TiO_2 particles aggregated densely appeared white. It was suggested that the distribution of TiO_2 particles on the hybrid spherical m
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icrobeads was related to electric repulsion between the CSS^- group and TiO_2. The narrower the zeta potential distribution of TiO_2 particles in the sphering pH condition is, the more TiO_2 particles were driven out from the cellulose xanthate domain.
(2) In order to develop the environment friendly colored materials, cellulose composite spherical microbeads hybridized with TiO_2 particles and inorganic pigment were prepared by a phase-separation method using viscose and an aqueous solution containing sodium polyacrylate. We also report our findings regarding the relationships between cellulose xanthate and the electronic characteristics of TiO_2 particles used in the cellulose/inorganic material composite sphering process. These findings suggest that the location of TiO_2 particles in cellulose microbeads is related to electrical repulsion between the CSS^- group and TiO_2. The use as color pigment of TiO_2 powder is limited, since its color is white. The cellulose composite spherical microbeads covered with TiO_2 and Fe_2O_3 particles were developed. These composite microbeads retained the photocatalytic property of TiO_2. Less
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