X-ray diffraction examination of materials/ sol-gel transitionSiO 2 gelsSilica gels were presented from alcoholic solutions of tetraethylorthosilicate (TEOS) using a two-step hydrolysis process; small angle X-ra
Sol-gel transition in simple silicates Source: Journal of Non-Crystalline Solids Diffusion of Hydrogen and Deuterium in Fused Quartz Source: The Journal of Chemical Physics Urbach absorption edge of silica: reduction of glassy disorder by fluorine doping Source: Journal of Non-Crystalline Solids ...
to this date. Sol–gel silicates, though safe and biocompatible, are soluble in body fluids, and, thus, unsuitable for producing stable xenografts. Injectable cell delivery vehicles based on thermosensitive sol–gel transition materials are not completely bioresorbable, and do not generally enjoy GRAS...
The 3D printing precursors effectively act as finite building blocks that can be formulated into a “AM Feedstocks” either in solution (e.g., a resin for photopolymerization routes, or an ink or slurry with various viscosities) or undergoing a sol-gel transition to form a gel or xerogel tha...
The transition from the highRvalues at the surface to the nearly flat value in the alteration layers indicates that the voids are isolated and not interconnected. Interconnected porosity with a link to the vacuum surface render this transition more gradual with increased interconnection depth. The mos...
A new series of Mn-based catalysts (Mn-TiO2, Ce-Mn-TiO2, Mn-TiO2-SO42–, and Ce-Mn-TiO2-SO42–) were successfully elaborated using the sol–gel method associated with supercritical drying approach for the low-temperature NO-SCR by NH3. The physicochemical properties of aerogel powders were...
Special interest has been paid to the incorporation of copper into glassy matrices such as silica or silicates, because they are technologically simple to obtain and conform at low cost even for large size. Among the different techniques employed to prepare these materials, sol–gel process appears...
The chemistry of sol-gel processing is well documented in the prior art. See, e.g., (1) Brinker et al, "Sol-gel Transition in Simple Silicates", J. Non-Cryst. Solids, 48 (1982) 47-64; (2) Brinker et al, "Sol-gel Transition in Simple Silicates II", J. Non-Cryst. Solids, 63...
the sol through a transition temperature to a deposition temperature, maintaining the pH, removing alkali metal ions and simultaneously adding alkali metal silicate from the system at a rate such that the number of silica particles in the sol remains constant while the temperature is being raised....
and the rheological properties of the polymer. The amine group on the mostly deacetylated polymer has a pKa in the range of 5.5 to 6.5, depending on the source of the polymer. At low pH, the polymer is soluble, with the sol-gel transition occurring at approximate pH 7. Both natural chit...