Multi-functional material with photocatalytic functions and method of manufacturing same
First Claim
1. A multi-functional material with a photocatalytic function, comprising:
- a base;
a photocatalytic layer having a photocatalytic function and disposed on a surface of said base, said photocatalytic layer including at least a surface layer exposed outwardly, said surface layer being composed of fine photocatalytic particles joined together with interstices defined therebetween at a predetermined porosity;
particles which are smaller that said interstices filled in said interstices;
said particles filled in the interstices defined between said photocatalytic particles have a photocatalytic activity; and
said smaller metal particles are metal particles treated to have a colorless or white metal salt on exposed surfaces thereof.
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Abstract
Multi-functional materials are classified into those which have a photocatalytic layer with a photocatalytic function directly disposed on the surface of a base and those which have a photocatalytic layer with a photocatalytic function disposed on the surface of a base through a binder layer interposed therebetween. Photocatalytic particles of the photocatalytic layer are joined together by a surface energy or solid-state sintering. The photocatalytic layer has a structure in which fine particles fill interstices defined between photocatalytic particles. A metal such as Ag, Pt, or the like may be fixed or not fixed to surfaces of the photocatalytic particles.
17 Citations
5 Claims
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1. A multi-functional material with a photocatalytic function, comprising:
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a base;
a photocatalytic layer having a photocatalytic function and disposed on a surface of said base, said photocatalytic layer including at least a surface layer exposed outwardly, said surface layer being composed of fine photocatalytic particles joined together with interstices defined therebetween at a predetermined porosity;
particles which are smaller that said interstices filled in said interstices;
said particles filled in the interstices defined between said photocatalytic particles have a photocatalytic activity; and
said smaller metal particles are metal particles treated to have a colorless or white metal salt on exposed surfaces thereof. - View Dependent Claims (2)
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3. A multi-functional material with a photocatalytic function, comprising:
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a base;
a photocatalytic layer having a photocatalytic function and disposed on a surface of said base, said photocatalytic layer including at least a surface layer exposed outwardly, said surface layer being composed of fine photocatalyic particles joined together with interstices defined therebetween at a predetermined porosity;
particles which are smaller that said interstices filled in said interstices;
said particles filled in the interstices defined between said photocatalytic particles have a photocatalytic activity;
said smaller metal particles are metal particles treated to have a colorless or white metal salt on exposed surfaces thereof;
said photocatalytic are made of TiO2, said smaller particles are made of Ag, and said Ag particles are treated with solution containing halides to form said colorless or white metal salt.
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4. A method of manufacturing a multi-functional material with a photocatalytic function, having photocatalytic particles with interstices defined therebetween and filled with particles which are smaller in diameter than the interstices, said photocatalytic particles being joined together at a predetermined porosity, said method comprising the steps of:
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forming a photocatalytic layer on a surface of a base;
thereafter coating a metal alkoxide or an organic metal salt on a surface of said photocatalytic layer, and then drying and heating the coated metal alkoxide or organic metal salt to fill said interstices defined between said photocatalytic particles with particles which are smaller than said interstices;
thereafter fixing colored fine metal particles to the surface of said photocatalytic layer; and
reacting the colored fine metal particles with a solution or gas to produce a colorless or white metal salt on at least surfaces of the colored fine metal particles.
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5. A method of manufacturing a multi-functional material with a photocatalytic function, having photocatalytic particles with interstices defined therebetween and filled with particles which are smaller in diameter than the interstices, said photocatalytic particles being joined together at a predetermined porosity, said method comprising the steps of:
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coating a mixture of said photocatalytic particles and the smaller particles in the form of a sol, a precursor, or a suspension on a thermoplastic base thereby to form a photocatalytic layer, thereafter softening said thermoplastic base to embed a portion of a lower layer of the photocatalytic layer in the thermoplastic base, and then solidifying said thermoplastic base;
bringing into contact with the photocatalytic layer a solution containing a salt for forming an insoluble, colorless or white salt with metal ions of the particles filled in the interstices between the photocatalytic particles, and thereafter irradiating the solution with light containing ultraviolet rays;
said photocatalytic particles are made of TiO2, the metal particles filled in the interstices between the photocatalytic particles are made of Ag, and said solution containing a salt for forming an insoluble, colorless or white salt with metal ions comprises an aqueous solution of a halide selected from the group consisting of KI, KCl, and FeCl3.
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Specification