纳米复合膜

Abstract(#br)Poly(dimethylsiloxane–urethane) (PDMS–PU) nanocomposite membranes with various concentrations of polyhedral oligomeric silsesquioxanes (POSS) were synthesised and the influence of POSS molecules on gas transport properties was studied. In this, two different types of POSS nanoparticles such as CyPOSS and POSS-H were incorporated and their effect on permeation properties was studied. Nanocomposite membranes were characterized using DSC, AFM, XRD and contact angle measurements.

Abstract(#br)Inspired by the silica formation process mediated by silica deposition vesicle (SDV) in diatoms or sponges, silica nanoparticles (SiO 2 ) were in-situ formed within oleophilic polydimethylsiloxane (PDMS) bulk matrix through the controlled biomimetic mineralization in confined space, using either NH 3 or cysteamine as inducer/catalyst. Accordingly, different kinds of PDMS-SiO 2 nanocomposite membranes were fabricated.

Abstract(#br)Nanocomposite membranes were synthesized using unmodified and surface modified imogolite nanotubes. Membranes were through interfacial polymerization of polyamide onto polyacrylonitrile (PAN) macroporous supports. Surface modification was done using two different polymers: polyvinylpyrrolidone (PVP) and polydimethylsiloxane (PDMS). These polymers were selected to improve nanotube dispersion in chloroform and n-hexane solvents which were used during membrane synthesis.

Abstract(#br)Nanocomposite membranes were synthesized by incorporating aluminogermanate imogolite nanotubes (GeINTs) into polyamide thin-films. Thin-films were prepared by interfacial polymerization using m-phenylenediamine (MPD) and 1,3,5-trimesoylchloride (TMC). The GeINTs were surface modified with hydrophobic vinyl terminated polydimethylsiloxane (PDMS) and their orientation manipulated using an alternating current (AC) electric field. The prepared GeINTs were characterized by their physical morphology, surface chemistry, orientation, and aggregation status in the relative media.

摘要\n沸石咪唑酸盐骨架( ZIFs )因其与聚合物良好的相容性，以及在几种重要的气、液分子动力学直径范围内的超微孔道而受到广泛关注。本研究合成了三种不同的ZIF粒子，即ZIF-90及其衍生物( ZIF-91和ZIF-92 )，并将其引入聚二甲基硅氧烷( PDMS )基体中，制备了用于乙醇渗透蒸发回收的ZIF / PDMS纳米复合膜。通过各种技术表征了ZIF颗粒及其纳米复合膜的形貌和结构。结果表明，具有羟基官能团的ZIF - 91粒子与PDMS具有良好的相容性，在PDMS基体中分散良好。同时，ZIF-91 / PDMS纳米复合膜的渗透汽化性能高于相同负载量20wt %的ZIF-90 / PDMS和ZIF-92 / PDMS纳米复合膜。同时考察了颗粒负载量、进料浓度和温度对ZIF-91 / PDMS膜分离性能的影响。结果表明，ZIF-91 / PDMS-20 wt %膜在55℃时分离因子为15.8，总通量为84.6 g / ( m2 h )，高于纯PDMS ( 4.1，496 g / ( m2 h ) )。此外，利用温度和进料浓度的二次方程建立了ZIF-91 / PDMS膜通量和分离因子的渗透汽化模型，可根据实验条件预测分离性能。