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Síntese, caracterização e aplicação de estanhosilicatos como catalisadores heterogêneos para produção de biocombustíveis
(Universidade Estadual Paulista (UNESP), 2016)
1H, 29Si and 119Sn double and triple resonance NMR spectroscopy of the small-pore framework sodium stannosilicate Na2SnSi3O9·2H2O
(2020-06-01)
The small-pore framework sodium stannosilicate AV-10, chemical composition Na2SnSi3O9·2H2O and known crystallographic structure, was synthesized by hydrothermal crystallization. This stannosilicate is built up of a ...
Síntese, caracterização e aplicação de estanhosilicatos como catalisadores heterogêneos para produção de biocombustíveis
(Universidade Estadual Paulista (Unesp), 2016-06-23)
O principal objetivo desse trabalho foi a síntese, caracterização e aplicação de catalisadores heterogêneos para produção de biocombustíveis, especificamente a produção de biodiesel (ésteres metílicos e etílicos de ácidos ...
Structural characterization of the lithium silicides Li15Si4, Li13Si4, and Li7Si3 using solid state NMR
(Royal Society of Chemistry - RSCCambridge, 2012)
Local environments and lithium ion dynamics in the binary lithium silicides Li15Si4, Li13Si4, and Li7Si3 have been characterized by detailed variable temperature static and magic-angle spinning (MAS) NMR spectroscopic ...
Intermediate role of gallium in oxidic glasses: solid state NMR structural studies of the Ga2O3-NaPO3 system
(American Chemical Society - ACSWashington, DC, 2014-07)
A series of (NaPO3)1-x(Ga2O3)x glasses (0 ≤ x ≤ 0.35) prepared by conventional melt-quenching methods has been structurally characterized by various complementary high resolution one-dimensional and two-dimensional (2D) ...
Glass-to-Vitroceramic Transition in the Yttrium Aluminoborate System: Structural Studies by Solid-State NMR
(AMER CHEMICAL SOC, 2010)
The crystallization of laser glasses in the system (B(2)O(3))(0.6){(Al(2)O(3))(0.4-y)(Y(2)O(3))(y)} (0.1 <= y <= 0.25) doped with different levels of ytterbium oxide has been investigated by X-ray powder diffraction, ...
Structural studies of NaPO3-WO3 glasses by solid state NMR and Raman spectroscopy
(Royal Soc Chemistry, 2006-01-01)
Vitreous samples were prepared in the (100 2 x) NaPO3-x WO3 (0 <= x <= 70) glass forming system using conventional melting-quenching methods. The structural evolution of the vitreous network was monitored as a function of ...
Structural studies of NaPO3-WO3 glasses by solid state NMR and Raman spectroscopy
(Royal Soc Chemistry, 2006-01-01)
Vitreous samples were prepared in the (100 2 x) NaPO3-x WO3 (0 <= x <= 70) glass forming system using conventional melting-quenching methods. The structural evolution of the vitreous network was monitored as a function of ...
Structural similarity on multiple length scales and its relation to devitrification mechanism: a solid-state NMR study of alkali diborate glasses and crystals
(2009)
The nature of the devitrification process is a fundamental problem in glass science and governs the ultimate stability of glass. It is hypothesized that the devitrification mechanism of a given glass composition is strongly ...