Network model for the evolution of the pore structure of silicon-carbide membranes during their fabrication

Design and function of biomimetic multilayer water purification membranes

“…A variety of new materials [for example, polymers ( 4 – 8 ), biopolymers ( 9 – 12 ), and inorganic nanomaterials ( 13 – 23 )] and novel fabrication methods [for example, block copolymer self-assembly ( 5 , 6 , 8 ), template synthesis ( 7 , 15 ), track-etching technique ( 23 , 24 ), chemical vapor deposition ( 25 , 26 ), and layer-by-layer assembly ( 27 )] have been developed to improve the purification efficiency of these membranes. However, preparing low-cost water purification membranes while retaining mechanical strength and high purification performance remains a challenge.…”

Molecular simulation study of penetrant gas transport properties into the pure and nanosized silica particles filled polysulfone membranes

“…Generally, to improve the gas transport properties of glassy or rubbery polymer membranes, the nanoscaled particles such as nonporous silica, molecular sieve, zeolites, nanotube, TiO 2 and ZrO 2 are added [22,23]. Various factors such as (a) characteristics of each component in nanocompsite membranes (for instance, concentration, particle size and filler shape and degree of polymerization of polymer), (b) the degree of compatibility between nanoparticle and polymer matrix which is related to the amount of interaction energy between particles and polymer, (c) presence or absence of interfacial defects, (d) morphology and (e) fabrication process of nanocomposite membrane, have a considerable influence on gas transport behaviors of polymer/inorganic mixed-matrix membranes (MMMs) [24,25]. For example, in chemical industry, for the separation of hydrocarbons from their mixtures poly(1-trimethylsilyl-1-propyne) [PTMSP] was suggested as an appropriate polymeric membrane, because this polymer is extremely permeable to hydrocarbons and has high hydrocarbon/permanent gas selectivity, but the poor chemical resistance of this material due to its solubility in all liquid hydrocarbons, leads to the prohibition of its usages as an industrial membrane [26].…”

Microporosity and CO2 Capture Properties of Amorphous Silicon Oxynitride Derived from Novel Polyalkoxysilsesquiazanes

“…Micro and mesoporous structure formation through the polymer-derived ceramics (PDCs) [1,2] route has received increasing attention as an attractive ceramic processing route to develop gas separation membranes, gas sorbents and catalysts with thermally and/or chemically stable amorphous systems such as silicon nitride [3], silicon carbide [4,5,6,7,8,9], silicon carbonitride (Si–C–N) [10], silicon oxycarbide (Si–O–C) [11,12,13], silicon oxycarbonitride (Si–O–C–N) [14,15,16] and other quaternary Si–M–C–N (M=B, [17,18], Ni [19]). During the crosslinking and subsequent high-temperature pyrolysis of polymer precursors, by-product gases such as CO 2 , CH 4 , NH 3 and H 2 were detected, and the microporosity in the amorphous PDCs could be assigned to the release of the small gaseous species formed in-situ [14,15,16,20,21,22,23].…”