混合膜

Abstract(#br)To improve the affinity between silicalite-1 and polydimethylsiloxane (PDMS), the silicalite-1 particles were modified by a silane coupling agent vinyltriethoxysilane (VTES) and incorporated into polydimethylsiloxane (PDMS) matrix for the preparation of silicalite-1/PDMS hybrid membranes. The modified silicalite-1 particles were examined by XRD, FT-IR and TGA, and the results showed that the silane coupling agent was bonded to the surface of silicalite-1 particles through chemical bonds and the modification did not influence the framework of silicalite-1 crystals.

Abstract(#br)The dehydration of glycerin solution is an important step in glycerin purification process. In present work, pervaporative dehydration of glycerin solution was studied using HybSi and polydimethylsiloxane (PDMS) pervaporation membranes. The effects of physical property of membrane, operating parameters and glycerin concentrations on the membrane permeate flux and selectivity were examined. The present studies showed that hydrophilic HybSi membrane could provide higher permeate flux as compared to hydrophobic PDMS membrane under an identical operating condition.

Abstract(#br)Metal–organic frameworks (MOFs) have received much attention in recent years because of their good compatibility with polymer as well as their porous structure that facilitates transport fillers in a polymer matrix. In this study, MIL-53 particles were synthesized and incorporated into polydimethylsiloxane (PDMS) matrix to produce novel MIL-53/PDMS hybrid membrane. The morphologies and structures of MIL-53 particles and their hybrid membranes were characterized by SEM, XRD, FTIR, AFM and contact angle.

Abstract(#br)Graphene was produced either by chemical reduction of graphene oxide (GO) using hydrazine hydrate (HG)/sodium borohydride (BG) or by straight electrochemically exfoliation of graphite (EG). The X-ray diffraction and Raman spectroscopy confirmed smaller in-plane crystalline sizes for the chemically produced graphenes, and more number of layers and therefore lower structural defects for the EG sample.(#br)The graphene samples were used to prepare polydimethylsiloxane (PDMS)–graphene (G)/polyethersulfone (PES) hybrid membranes to investigate their pervaporative performances.

深紫外( DUV )带通滤波器在现代环境消毒灭菌领域发挥着重要作用。提出了一种可用于制造柔性DUV带通滤波器的新型低成本光散射材料。综合考虑折射率匹配条件和瑞利-甘斯-德拜( RGD )散射理论，氟化钙( CaF2 )掺杂聚二甲基硅氧烷( PDMS ) DUV带通滤波器在峰值波长272.5  nm附近表现出90 %以上的透过率。应变测量得到了相对稳定的峰值波长，拉伸比为12 %。实验测量了1.5   nm   ° C - 1的温度响应。为了模拟器件的DUV光滤波特性，基于蒙特卡罗数值模拟，发展了一种改进的随机游走散射模型。为了验证器件透射率谱的可调性，在原始PDMS基体中掺杂50   vol %的低分子量PDMS，得到峰值波长10   nm的蓝移，掺杂1.4   wt %的CdSe / ZnS胶体量子点( CQDs )，得到17   nm的红移，可调谐柔性DUV带通滤波器的实现为环境净化设备和可穿戴光子器件的发展奠定了基础。