复合膜

Abstract(#br)Polydimethylsiloxane (PDMS) coated membranes on a polysulfone (PSf) support were fabricated for propylene recovery from off-gas stream. PDMS coated membrane, however, showed trade-off trends that permeability and selectivity are inversely proportional to each other. Addition of silica nanoparticles of 12–400\u003cce:hsp sp=\"0.25\"/\u003enm size into PDMS matrix enhanced both separation factor and propylene permeance from 5.2 to 7.3 from 31 to 36\u003cce:hsp sp=\"0.25\"/\u003eGPU, respectively. Silica nanoparticles in composite membrane tended to agglomerate with each other.

Abstract(#br)Crosslinked polydimethylsiloxane (PDMS)/ceramic composite membranes were prepared and employed for desulfurization of model gasoline composed of n-octane and thiophene. The structural morphology and thermal stability of the composite membranes were characterized by scanning electron microscope (SEM) and thermogravimetric analysis (TGA). The pervaporation performances of the membranes under various crosslinking agent amounts, feed sulfur content, feed temperature, permeate pressure and feed flow rate were investigated.

Abstract(#br)The objective of this work was to investigate the effect of polydimethylsiloxane (PDMS) molecular weights on the pervaporation performance and the confinement behavior of PDMS/ceramic composite membranes for the separation of ethanol from aqueous solutions by pervaporation. PDMS with three different molecular weights was used to prepare PDMS/ceramic composite membranes.

Abstract(#br)In this work, ceramic hollow fiber supported polydimethylsiloxane (PDMS) composite membranes were developed by dip-coating PDMS layer on the surface of macroporous ceramic hollow fiber support. By controlling the properties of polymer solution and ceramic hollow fiber, high-quality ceramic hollow fiber supported PDMS composite membranes were fabricated for pervaporation (PV) recovery of bio-butanol.

Abstract(#br)The mechanical strength and interfacial behavior have been of great significance for composite membranes. In this work, an in-situ nano-indentation/scratch technique was employed to probe mechanical properties and interfacial adhesion of ceramic-supported polydimethylsiloxane (PDMS) composite membranes. The nanostructures of active, transition and support layers were systematically correlated with measured mechanical and adhesive properties, as well as interfacial morphologies and separation performance.

Abstract(#br)Poly(fluoropropylmethylsiloxane) (PTFPMS), which had different properties with polydimethylsiloxane (PDMS) due to C\u003cce:glyph name=\"sbnd\"/\u003eF bond. The limitation for PTFPMS membrane to achieve industrial-scale applications was the forms of membrane modules. Thus, PTSPMS/polyetherimide (PEI) hollow fiber composite membranes have been prepared. Effects of PTFPMS concentration, coating method, selective layer thickness, operating pressure and temperature on the separation performance of the composite membranes have been investigated.

Abstract(#br)Solvent resistant nanofiltration (SRNF) technology is an energy efficient and environmentally friendly alternative to purify alcohol-based mixtures, but there exists a challenge in overcoming the trade-off between membrane flux and rejection. Herein, as the representative of the emerging family of MXenes, Ti 3 C 2 T x nanosheets with abundant –OH groups are chosen as nanofillers to prepare SRNF composite membrane after being incorporated into two typical polymer matrixes: hydrophilic polyethyleneimine (PEI) and hydrophobic polydimethylsiloxane (PDMS).

Abstract(#br)A flexible composite film based piezoelectric nanogenerator has been explored using lead-free (1− x ) KNaNbO 3 - x BaTiO 3 NPs ( x = 0.02, 0.04, 0.06 and 0.08) (used as KNN- x BTO) nanoparticles (NPs). The composite films were made of KNN-x BTO NPs impregnated into a Polydimethylsiloxane (PDMS) matrix. BTO was doped into the KNN lattice without affecting the orthorhombic phase of KNN. Structural analysis such as XRD and Raman spectroscopy were used to confirm the phase formation and atomic vibrations of the piezoelectric materials.

文摘( # br )本研究针对萃取膜生物反应器( EMBR )处理酚盐水废水的低力学性能、低传质和漏盐问题，介绍了一种简便的高性能静电纺丝-相转化复合膜的方法。通过干相转化法在电纺PDMS膜上涂复聚二甲基硅氧烷( PDMS )制备复合膜。其表面与相转化膜相似，而横截面在相转化层均匀分布电纺纤维，形成相互连通的孔隙。疏松的多孔结构和较高的孔隙率适合苯酚的渗透，疏水表面能排斥盐的侵入。复合膜( 56.5μm厚)的拉伸强度和断裂伸长率分别为1.7 MPa和60.0 %，在EMBR中稳定运行，考察了膜厚、苯酚浓度和废水流量等不同工艺变量的影响。在EMBR运行过程中，苯酚的最大去除率为508.9 mg L–1 d–1，微生物侧电导率变化\u003c 0.1 ms cm–1，苯酚的生物降解和除盐效果显著。苯酚传质系数最高，为8.8×10 - 7 m s-1。有理由相信，本研究为EMBR的应用制备了一种很有前景的替代膜。

Preparation and Gas Permeation Properties of PDMS-HNT Nanotube Composite MembranePDMS;HNT;nanotube;permeability;composite membrane;PDMS (polydimethylsiloxane)-HNT (halloysite nanotube) composite membranes were prepared with different amounts tendency of HNT 5, 10, 20 and 30 wt% and rubbery polymer PDMS. The characteristics of these membranes were studied by FT-IR, XRD, TGA, and SEM. Gas permeation experiment were performed under condition of $25^{\\circ}C$ and $3kg/cm^2$.