Buscar
Mostrando ítems 311-320 de 510
Controlled Cisplatin Delivery from Ureasil-PEO1900 Hybrid Matrix
(Amer Chemical Soc, 2010-03-18)
The ability of assembling inorganic, organic, and even bioactive components ill a single material unfolds all exciting direction in the development of novel Multifunctional hybrid materials. Recently, we have observed that ...
Diseño e Implementación de un Prototipo Electrónico para la Determinación de Metales Pesados en Agua.
El control y la evaluación de agentes químicos presentes en agua requieren de
instrumentación con exactitud, precisión y metodologías de análisis que permitan
implementar de forma oportuna las actividades de prevención, ...
Polymerization of acrylamide hydrogels in aqueous ethanol [Síntesis de hidrogeles de acrilamida en soluciones acuosas de etanol]
(2014)
The polymerization of acrylamide was performed in aqueous ethanol solutions, varying the concentration of ethanol in the solution; obtaining both nanogels as macrogels. The water absorbing capacity of the macrogels were ...
Small-angle x-ray scattering study of the structural evolution of the drying of sonogels with the liquid phase exchanged by acetone
(2004-03-01)
The structural evolution on the drying of wet sonogels of silica with the liquid phase exchanged by acetone, obtained from tetraethoxisilane sonohydrolysis, was studied in situ by small-angle x-ray scattering (SAXS). The ...
Preparation and characterization of spherical silica-porphyrin catalysts obtained by the sol-gel methodology
(Elsevier B.V., 2006-03-01)
This work describes the synthesis of a first-generation iron porphyrin catalyst entrapped in a silica matrix by the sol-gel route, leading to spherical particles. The catalyst was synthesized by the method of Stober, through ...
Small angle X-ray scattering study of surface modified tin oxide nanoparticles prepared by sol-gel route
(Springer, 2006-03-01)
The surface properties of SnO2 nanoparticles were modified by grafting ionic (Tiron (R). (OH)(2)C6H2(SO3Na)(2)(H2O)-H-.) or non-ionic (Catechol (R). C6H4-1,2-(OH)(2)) capping Molecules during aqueous sol-gel processing to ...
Tuning the acidic properties of aluminas via sol-gel synthesis: New findings on the active site of alumina-catalyzed epoxidation with hydrogen peroxide
(Elsevier B.V., 2006-11-15)
This study answers several pending questions about alumina-catalyzed epoxidation with aqueous 70 wt% H2O2. To evaluate the effect of the water-to-aluminum tri-sec-butoxide molar ratio, this was systematically changed from ...
Structural and Spectroscopic Properties of Luminescent Er3+-Doped SiO2-Ta2O5 Nanocomposites
(Wiley-Blackwell, 2011-04-01)
This paper reports on the preparation and structural, morphological, and luminescence properties of Er3+-doped nanocomposites based on SiO2-Ta2O5 prepared by the sol-gel method. The influence of the tantalum oxide content ...
Short-chain di-ureasil ormolytes doped with potassium triflate: Phase diagram and conductivity behavior
(2003-01-01)
Di-urea cross-linked poly(oxyethylene)/siloxane hybrids, synthesized by the sol-gel process and containing a wide concentration range of potassium triflate, KCF3SO3, have been analyzed by x-ray diffraction and differential ...
Relevance of sol–gel transition and spinodal decomposition for hierarchical porosity structure of monolithic alumina
(2021-01-01)
In situ techniques were used to investigate the hierarchical porous structure of alumina monoliths formed by the combined processes of sol–gel transition and spinodal phase separation. The addition of low molecular weight ...