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Metal oxide nanotube and process for production thereof

外国特許コード F110005176
整理番号 A121-42US
掲載日 2011年8月25日
出願国 アメリカ合衆国
出願番号 50256203
公報番号 20050077496
公報番号 7172747
出願日 平成15年3月26日(2003.3.26)
公報発行日 平成17年4月14日(2005.4.14)
公報発行日 平成19年2月6日(2007.2.6)
国際出願番号 JP2003003755
国際公開番号 WO2003099713
国際出願日 平成15年3月26日(2003.3.26)
国際公開日 平成15年12月4日(2003.12.4)
優先権データ
  • 特願2002-150356 (2002.5.24) JP
  • 2003WO-JP03755 (2003.3.26) WO
発明の名称 (英語) Metal oxide nanotube and process for production thereof
発明の概要(英語) (US7172747)
Spiral shaped fibers were utilized to prepare completely novel metal oxide nanotubes comprising solely metal oxides.
The metal oxide nanotubes comprise solely a hollow cylinder shaped metal oxide which may contain hydroxyl groups constituting a double helix and having hole diameter distributions containing two peak hole diameters ranging from 1 to 2 nm and from 3 to 7 nm.
The tubes may be obtained by forming spiral shaped fibers from a solution of compound 1 and compound 2 and using the fibers as a template for making the nanotubes.
The hydrogen adsorption and storage capacity of the metal oxide nanotubes are extremely good.
特許請求の範囲(英語) [claim1]
1. A metal oxide nanotube consisting solely of a metal oxide that may contain hydroxyl groups, which is constructed in a double spiral and a hollow cylinder and has a hole diameter distribution containing two peak hole diameters ranging from 1 to 2 nm and from 3 to 7 nm.
[claim2]
2. The metal oxide nanotube as in claim 1 wherein the metal is Si, Ti or Zr or mixtures thereof.
[claim3]
3. The metal oxide nanotube as in claim 1 being formed using spiral shaped fibers as a template, which are formed by dissolving compound 1 represented by chemical formula 1
and compound 2 represented by chemical formula 2
in water or a mixed solution of water and alcohol, wherein A and B represent saccharide radicals that may be identical or different from each other, R represents an alkyl group and R' represents a hydrogen atom or an alkyl group, and allowing the resulting solution to stand.
[claim4]
4. A gas adsorption and storage material comprising the metal oxide nanotube as in claim 1.
[claim5]
5. A hydrogen adsorption and storage material comprising the metal oxide nanotube as in claim 1.
[claim6]
6. A method for manufacturing a metal oxide nanotube comprising the steps of dissolving compound 1 represented by chemical formula 1
and compound 2 represented by chemical formula 2
in water or a mixed solution of water and alcohol, wherein A and B represent saccharide radicals that may be identical or different from each other, R represents an alkyl group and R' represents a hydrogen atom or an alkyl group, allowing the resulting solution to stand, mixing further a metal oxide precursor and a catalyst for converting the metal oxide precursor into a metal oxide into the solution whereby a gel is formed, and sintering the gel.
[claim7]
7. The method as in claim 6 wherein the metal is Si, Ti or Zr or a mixture thereof.
[claim8]
8. The method as in claim 6 wherein the metal oxide precursor is an alkoxide of said metal.
[claim9]
9. The method as in claim 6 wherein compound 1 and compound 2 are dissolved in a mixed solution of water and an alcohol having four carbon atoms or less, and the content of alcohol in the mixed solution is 10 to 50% by weight.
[claim10]
10. The method as in claim 6 wherein the catalyst is a basic catalyst.
[claim11]
11. The method as in claim 6 wherein the ratio of compound 1 to the sum total of compounds 1 and 2 is 20 to 90 mol % and the ratio of metal in the metal oxide precursor to compound 1 is 10 to 150 fold equivalent.
[claim12]
12. The method as in claim 6 wherein A and B may be identical or different from each other and represent radicals obtained by removing hydrogen from any one of the hydroxyl groups bonded to an aldopyranose six membered ring.
[claim13]
13. The method as in claim 12 wherein the aldopyranose is glucopyranose or galactopyranose.
[claim14]
14. The method as in claim 6 wherein the alkanoylamino group ( -- NHCOR) of compound 1 is located in a para position to the saccharide radical A, the amino group ( -- NR'H) of compound 2 is located in a para position to the saccharide radical B, A and B are identical saccharide radicals, R is a linear alkyl group having six to twenty carbon atoms and R' is a hydrogen atom.
[claim15]
15. A metal oxide nanotube as in claim 2 being formed using spiral shaped fibers as a template, which are formed by dissolving compound 1 represented by the chemical formula 1
and compound 2 represented by chemical formula 2
in water or a mixed solution of water and alcohol, wherein A and B represent saccharide radicals that may be identical or different from each other, R represents an alkyl group and R' represents a hydrogen atom or an alkyl group, and allowing the resulting solution to stand.
[claim16]
16. A gas adsorption and storage material comprising the metal oxide nanotube as in claim 2.
[claim17]
17. A gas adsorption and storage material comprising the metal oxide nanotube as in claim 3.
[claim18]
18. A gas adsorption and storage material comprising the metal oxide nanotube as in claim 15.
[claim19]
19. A hydrogen adsorption and storage material comprising the metal oxide nanotubes as in claim 2.
[claim20]
20. A hydrogen adsorption and storage material comprising the metal oxide nanotubes as in claim 3.
[claim21]
21. A hydrogen adsorption and storage material comprising the metal oxide nanotubes as in claim 15.
[claim22]
22. The method as in claim 7 wherein the metal oxide precursor is an alkoxide of said metal.
[claim23]
23. The method as in claim 22 wherein compound 1 and compound 2 are dissolved in a mixed solution of water and alcohol having four carbon atoms or less and the content of alcohol in the mixed solution is 10 to 50% by weight.
[claim24]
24. The method as in claim 23 wherein the catalyst is a basic catalyst.
[claim25]
25. The method as in claim 24 wherein the ratio of compound 1 to the sum total of the compounds 1 and 2 is 20 to 90 mol % and the ratio of metal in the metal oxide precursor to the compound 1 is 10 to 150 fold equivalent.
[claim26]
26. The method as in claim 25 wherein A and B may be identical or different from each other and represent radicals obtained by removing hydrogen from any one of the hydroxyl groups bonded to an aldopyranose six membered ring.
[claim27]
27. The method as in claim 26 wherein the aldopyranose is glucopyranose or galactopyranose.
[claim28]
28. The method as in claim 27 wherein the alkanoylamino group ( -- NHCOR) of compound 1 is located in a para position to the saccharide radical A, the amino group ( -- NR'H) of compound 2 is located in a para position to the saccharide B radical, A and B are identical saccharide radicals, R is a linear alkyl group having six to twenty carbon atoms and R' is a hydrogen atom.
  • 発明者/出願人(英語)
  • SHIMIZU TOSHIMI
  • JUNG JOHN HWA
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 423/592.1
  • 206/.7
  • 423/325
  • 423/335
  • 423/338
  • 423/593.1
  • 423/594.12
  • 423/598
  • 423/608
  • 423/610
  • 502/400
  • 502/407
  • 977/811
  • 977/963
参考情報 (研究プロジェクト等) CREST Creation and Functions of New Molecules and Molecular Assemblies AREA
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