Propylamino-functionalized mesoporous thin films were synthesized via co-condensation of the oxide precursor tetraethoxysilane (TEOS, Merck) and the amine precursor 3-aminopropyltriethoxysilane (APTES, Fluka 98%) in the presence of the template (F127 block copolymer, Aldrich, Mw ~13600). The precursor solution was prepared using 0.8 TEOS:0.2 APTES:0.005 F127:24 EtOH:5.2 H2O:0.28 HCl. This solut...

The reaction of γ-alumina with tetraethylorthosilicate (TEOS) vapor at low temperatures selectively yields monomeric SiO(x) species on the alumina surface. These isolated (-AlO)3Si(OH) sites are characterized by PXRD, XPS, DRIFTS of adsorbed NH3, CO, and pyridine, and (29)Si and (27)Al DNP-enhanced solid-state NMR spectroscopy. The formation of isolated sites suggests that TEOS reacts preferent...

2014 Silicon tetraethoxyde (TEOS) monomers are dissolved in a water/ethanol mixture. Through hydrolysis and condensation they aggregate to form branched siloxane polymers ; in a few hours these polymers build a gel throughout the solution. The patterns formed by the growing polymers are studied through small angle neutron scattering. In the reaction bath, these patterns result from repulsive in...

A siliceous porous material containing nickel was synthesized by means of an intercalation treatment method using a layered sodium octosilicate ilerite as a starting base material. The sodium ions between the crystalline silicate sheets in the octosilicate were exchanged for hydrogen ions in dilute hydrochloric acid, and then the basal spaces between the silicate sheets were extended by introdu...

Vinasse was successfully utilized to synthesize carbon–silica composite with a low-cost silica source available in Thailand (sodium silicate, Na2SiO3) and most commonly used source, tetraethyl orthosilicate (TEOS). The composites were prepared by simple one-step sol–gel process varying the vinasse (as carbon source) (Na2SiO3 or TEOS) weight ratio. resulting characterized N2 adsorption, moisture...