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DC Field | Value | Language |
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dc.contributor.author | Donatti, D. A. | - |
dc.contributor.author | Ibanez Ruiz, A. | - |
dc.contributor.author | Vicelli, M. R. | - |
dc.contributor.author | Vollet, D. R. | - |
dc.date.accessioned | 2014-05-20T15:28:48Z | - |
dc.date.accessioned | 2016-10-25T18:03:59Z | - |
dc.date.available | 2014-05-20T15:28:48Z | - |
dc.date.available | 2016-10-25T18:03:59Z | - |
dc.date.issued | 2007-04-01 | - |
dc.identifier | http://dx.doi.org/10.1002/pssa.200622394 | - |
dc.identifier.citation | Physica Status Solidi A-applications and Materials Science. Weinheim: Wiley-v C H Verlag Gmbh, v. 204, n. 4, p. 1069-1076, 2007. | - |
dc.identifier.issn | 0031-8965 | - |
dc.identifier.uri | http://hdl.handle.net/11449/38543 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/38543 | - |
dc.description.abstract | About similar to 2.1 x 10(-3) Mol SiO2 cm(-3) and similar to 88%-volume liquid-phase silica wet gels were prepared from oxalic-acid-catalyzed tetraethoxysilane (TEOS) sonohydrolysis. Aerogels were obtained by supercritical CO2 extraction. The samples were analyzed by thermogravimetry, small-angle X-ray scattering and nitrogen adsorption. Wet gels can be described as mass fractal structures with fractal dimension D similar to 1.94 and structural characteristic length zeta changing between similar to 3.3 to similar to 3.0 nm in the studied range of the catalyst concentration. A fraction of the porosity is apparently eliminated in the supercritical process. The values of the BET specific surface S-BET, the total pore volume V-p and the mean pore size l(p) of the aerogels were found to change almost randomly around the mean values S-BET = 874 m(2) g(-1), V-p = 0.961 cm(3) g(-1) and l(p) = 4.4 nm with catalyst concentration variation. These values were not substantially different from those from an equivalent HCl-catalyzed aerogel. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. | en |
dc.format.extent | 1069-1076 | - |
dc.language.iso | eng | - |
dc.publisher | Wiley-Blackwell | - |
dc.source | Web of Science | - |
dc.title | Structural properties of silica gels prepared from oxalic-acid-catalyzed tetraethoxysilane sonohydrolysis | en |
dc.type | outro | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.description.affiliation | Univ Estadual Paulista, UNESP, IGCE, Dept Fis, BR-13500970 Rio Claro, SP, Brazil | - |
dc.description.affiliationUnesp | Univ Estadual Paulista, UNESP, IGCE, Dept Fis, BR-13500970 Rio Claro, SP, Brazil | - |
dc.identifier.doi | 10.1002/pssa.200622394 | - |
dc.identifier.wos | WOS:000246194800026 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.relation.ispartof | Physica Status Solidi A: Applications and Materials Science | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
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