Now showing items 11-20 of 321
The influence of Na+ on the anilinepropylsilica xerogel synthesis by using the fluoride nucleophilic catalyst
(Springer-verlagNew YorkEUA, 2003)
Synthesis, characterization, and catalytic properties of a mesostructured lamellar xerogel tungsten oxide phase
(ELSEVIER SCIENCE BV, 2011)
Cetyltrimethylammonium bromide (CTAB) and n-hexadecylamine (HDA) have been used as template in the synthesis of a mesolamellar xerogel tungsten oxide phase (WO(3)/CTAB/HDA). The catalytic properties of the resulting material ...
Optical characteristics of Er3+-Yb3+ doped SnO2 xerogels
(Elsevier B.V., 2002-10-07)
Er3+ doped SnO2 xerogels have been obtained from aqueous colloidal suspensions. Emission and excitation spectra were obtained and allowed the identification of two main families of sites for Er3+. In the first one Er3+ ...
Aproveitamento da casca de arroz para a produção de xilitol e sílica xerogel
(Universidade Federal de Santa MariaBRQuímicaUFSMPrograma de Pós-Graduação em Química, 2009-12-01)
The generation of residual materials and its unavoidable disposal in the environment has been a reason of great concern, not only environmentally but also economically. The use of these renewable residual feedstocks, not ...
The gelation temperature effects in the anilinepropylsilica xerogel properties
(Elsevier Science BvAmsterdamHolanda, 2002)
Small-angle X-ray scattering and nitrogen adsorption study of the nanoporosity elimination in TEOS sonohydrolysis-derived xerogels
Small-angle X-ray scattering (SAXS) and nitrogen adsorption techniques were used to study the temperature and time structural evolution of the nanoporosity in silica xerogels prepared from acid- and ultrasound-catalyzed ...