The control of indoor air quality and the detection toxic gases volatile organic compounds are important tasks for improving life work conditions, highly demanded in a variety industrial, agricultural environmental applications. This requires development special gas sensing materials with high response to different chemical nature. Herein we report study on synthesis, characterization investiga...

Filmes finos obtidos a partir de xerogel de V 2 O 5 com distintas quantidades de Li intercalado eletroquimicamente foram caracterizados utilizando diferentes técnicas in-situ. As mudanças nas propriedades mecânicas foram investigadas utilizando medidas de impedância eletroacústica e estes experimentos indicaram que o processo de intercalação não produz mudanças importantes nas propriedades visc...

Nucleation and crystallization from xerogels of the system Si02-ZnOA1203 are induced and probed by Cr. Besides the traditional techniques, such as X-ray diffraction, SAXS and TEM, ESR and optical techniques especially laser spectroscopy are employed for the investigation of the structural evolution during thermal treatments of these xerogels. Cr is served not only as a structure probe but also ...

A physical hydrogel prepared with the low-molecular-weight hydrogelator (LMWHG) CH2(C3H6CO-L-Phe-D-Oxd-OH)2 and water/ethanol mixture was applied as a potential "Trojan Horse" carrier into cells. By SEM and XRD analysis we could demonstrate that a fibrous structure is present in the xerogel, making a complex network. The gelator is derived from α-amino acids (Thr, Phe) and a fatty acid (azelaic...