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http://acervodigital.unesp.br/handle/11449/25008
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DC Field | Value | Language |
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dc.contributor.author | Vollet, Dimas R. | - |
dc.contributor.author | Donatti, Dario A. | - |
dc.contributor.author | Ruiz, Alberto Ibanez | - |
dc.contributor.author | Vicente, Fábio Simões de | - |
dc.date.accessioned | 2013-09-30T18:50:55Z | - |
dc.date.accessioned | 2014-05-20T14:16:39Z | - |
dc.date.accessioned | 2016-10-25T17:39:36Z | - |
dc.date.available | 2013-09-30T18:50:55Z | - |
dc.date.available | 2014-05-20T14:16:39Z | - |
dc.date.available | 2016-10-25T17:39:36Z | - |
dc.date.issued | 2010-10-01 | - |
dc.identifier | http://dx.doi.org/10.1107/S0021889810025161 | - |
dc.identifier.citation | Journal of Applied Crystallography. Malden: Wiley-blackwell, v. 43, p. 949-954, 2010. | - |
dc.identifier.issn | 0021-8898 | - |
dc.identifier.uri | http://hdl.handle.net/11449/25008 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/25008 | - |
dc.description.abstract | Dynamical scaling properties in fractal structures were investigated from small-angle X-ray scattering (SAXS) data of the kinetics of aggregation in silica-based gelling systems. For lack of a maximum in the SAXS intensity curves, a characteristic correlation distance xi was evaluated by fitting a particle scattering factor model valid for polydisperse coils of linear chains and f-functional branched polycondensates in solution, so the intensity at q = xi-1, I(xi-1, t), was considered to probe dynamical scaling properties. The following properties have been found: (i) the SAXS intensities corresponding to different times t, I(q, t), are given by a time-independent function F(q xi) = I(q, t)xi-D /Q, where the scattering invariant Q has been found to be time-independent; (ii) xi exhibited a power-law behavior with time as xi similar or equal to t alpha, the exponent alpha being close to 1 but diminishing with temperature; (iii) I(xi-1, t) exhibited a time dependence given by I(xi-1, t) similar or equal to t beta, with the exponent beta found to be around 2 but diminishing with temperature, following the same behavior as the exponent alpha. In all cases, beta/alpha was quite close to the fractal dimension D at the end of the studied process. This set of findings is in notable agreement with the dynamical scaling properties. | en |
dc.description.sponsorship | Laboratório Nacional de Luz Síncrotron (LNLS) | - |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | - |
dc.description.sponsorship | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | - |
dc.format.extent | 949-954 | - |
dc.language.iso | eng | - |
dc.publisher | Wiley-Blackwell | - |
dc.source | Web of Science | - |
dc.subject | dynamical scaling | en |
dc.subject | fractal structures | en |
dc.subject | small-angle X-ray scattering | en |
dc.subject | silica-based gels | en |
dc.title | Dynamical scaling in fractal structures in the aggregation of tetraethoxysilane-derived sonogels | en |
dc.type | outro | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.description.affiliation | Unesp Univ Estadual Paulista, IGCE Dept Fis, BR-13500970 Rio Claro, SP, Brazil | - |
dc.description.affiliationUnesp | Unesp Univ Estadual Paulista, IGCE Dept Fis, BR-13500970 Rio Claro, SP, Brazil | - |
dc.identifier.doi | 10.1107/S0021889810025161 | - |
dc.identifier.wos | WOS:000281996600001 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.relation.ispartof | Journal of Applied Crystallography | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
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