Composite shaped body and silica glass, and method for producing the same
AssigneeKyushu University
InventorsShigeru Fujino, Hiroshi Ikeda, Seiji Inaba, Toshihisa Kajiwara
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Abstract
The present invention provides a composite shaped body comprising silica nanoparticles and an organic polymer, wherein the silica nanoparticles and the organic polymer form a three-dimensional network; thereby provides: a composite shaped body which exhibits excellent formability and fabricability and which is also suited for use, for example, in producing a silica glass provided with an electrical conductivity; and a silica glass (especially, an electrically conductive silica glass) obtained by firing the composite shaped body.
Claims15
A composite shaped body, consisting of silica nanoparticles, an organic polymer, and a functional element, wherein
- the silica nanoparticles consist of hydrophilic or hydrophobic fumed silica and are dispersed in the organic polymer;
- a nanopore is formed in the organic polymer area;
- a weight ratio of the organic polymer to the silica nanoparticles is 0.02 or more and 0.45 or less,
- the organic polymer comprises polyvinyl alcohol,
- a saponification degree of the polyvinyl alcohol is 70% or more and 85% or less,
- a number-average degree of polymerization of the polyvinyl alcohol is 500 or more and 2000 or less, and
- the functional element exists all the way from at least a part of a surface of the shaped body to an inner area, to form a doped region, wherein the functional element is selected from the group consisting of aluminum oxide (Al2O3), copper, gold, silver, nitrate of gold or silver, oxide of gold or silver, chloride of gold or silver, carbonate of gold or silver, sulfate of gold or silver, organic metal salt of gold or silver, and hydrate compounds of gold or silver.
A silica glass which is obtained by firing a composite shaped body,
- wherein:
- the composite shaped body consists of silica nanoparticles and an organic polymer;
- the silica nanoparticles consist of hydrophilic or hydrophobic fumed silica and are dispersed in the organic polymer;
- a nanopore is formed in the organic polymer area;
- a weight ratio of the organic polymer to the silica nanoparticles is 0.02 or more and 0.45 or less;
- the organic polymer comprises polyvinyl alcohol,
- a saponification degree of the polyvinyl alcohol is 70% or more and 85% or less;
- and
- a number-average degree of polymerization of the polyvinyl alcohol is 500 or more and 2000 or less.
A method for producing a silica glass, the method comprising a firing step of firing a composite shaped body,
- wherein:
- the composite shaped body consists of silica nanoparticles and an organic polymer or consists of silica nanoparticles, an organic polymer and a functional element;
- the silica nanoparticles consists of hydrophilic or hydrophobic fumed silica and are dispersed in the organic polymer;
- a nanopore is formed in the organic polymer area of the composite shaped body;
- a weight ratio of the organic polymer to the silica nanoparticles is 0.02 or more and 0.45 or less;
- the organic polymer comprises polyvinyl alcohol,
- a saponification degree of the polyvinyl alcohol is 70% or more and 85% or less;
- a number-average degree of polymerization of the polyvinyl alcohol is 500 or more and 2000 or less;
- and
- in the case where the composite shaped body consists of the silica nanoparticles, the organic polymer and the functional element, the functional element exists all the way from at least a part of a surface of the shaped body to an inner area, to form a doped region, wherein the functional element is selected from the group consisting of aluminum oxide (Al2O3), copper, gold, silver, nitrate of gold or silver, oxide of gold or silver, chloride of gold or silver, carbonate of gold or silver, sulfate of gold or silver, organic metal salt of gold or silver, and hydrate compounds of gold or silver.
Dependencies are inferred from the claim text.