Preparation and gas permeation properties of thermally stable organosilica membranes derived by hydrosilylation

Evaluating the gas permeation properties and hydrothermal stability of organosilica membranes under different hydrosilylation conditions

“…Organosilica structures were characterized by 29 Si and 13 C NMR, respectively. The details of the measurement conditions were described in a previous paper [22]. stability testing Fig.…”

“…Silsesquioxane (SQ) sols (VT-type) were synthesized via the hydrolysis and polymerization of vinyltrimethoxysilane (VTMS) and triethoxysilane (TRIES) [22]. A specified amount of TRIES and VTMS was mixed with isopropyl alcohol (IPA), then H 2 O and HCl was added as a catalyst at 25°C for 1 h. The molar ratios of the solution were TRIES (Si-H)/VTMS (Si-CH ¼CH 2 ) (¼ H/V)¼0.5 $ 5, H 2 O/(TRIES þVTMS) ¼240, and HCl/(TRIES þ VTMS)¼ 1/10, and the Si precursor was maintained at 1 wt%.…”

“…Organosilica membranes with 50% porosity and an average pore size of 1 μm were coated onto porous α-alumina tubes [22].…”

“…1 [22]. The gas permeation properties and thermal stability of organosilica membranes (VTT-type prepared by vinyltrimethoxysilane (VTMS), triethoxysilane (TRIES), and tetramethyldisiloxane (TMDSO); and VT-type prepared by VTMS and TRIES) were evaluated to discuss the effect of Si precursor on network structures.…”

Effects of carbon addition on the electrical properties of bulk silicon-oxycarbide ceramics

“…Polymer-derived ceramics (PDCs) based on Si-O-C have attracted much attention [1,2], especially for potential applications in sensors [3,4], anode materials for Li-ion rechargeable batteries [5][6][7], phosphors in LED systems [8][9][10], immobilization of irradiated graphite waste [11], micro-parts and patterns in hightemperature microelectromechanical systems (MEMS) [12][13][14], porous ceramics for thermal insulators [15,16], water-and gastreatment membranes [17], precursors for SiC powders [18], cost-effective fibers for structural applications [19], and coatings for metal parts [20], due to their attractive mechanical, thermal, creep, and oxidation resistance and chemical properties compared to amorphous SiO 2 [21][22][23][24][25][26][27][28][29]. Although some applications of SiOC ceramics, such as MEMS, Li-ion batteries, pressure sensors, heaters, and sealants, require control of electrical resistivity, data on electrical properties of SiOC ceramics are quite limited.…”