What is the structure of membrane materials?
Chemically homogeneous, physically isotropic Physically isotropic, chemically heterogeneous Physically anisotropic, chemically heterogeneous Physically and chemically heteroge neo us/an isotropic What materials form membranes? Ceramic polymeric ion-exchange symmetric micro porous Supported liquid Integral Asymmetric Micro porous Asymmetric composite What example materials are used? Alumina, silicate, graphite, metals extruded silicone rubber PTFE, polyethylene, polypropylene, polycarbonate Functionalised polymeric materials cellulose derivatives, polyamide, polysulphone Hydrophobic liquid in silicone rubber Cellulose derivatives, polyamide, polysulphone Ultra thin layer on micro porous polysulphone support Polymeric micro porous membranes are usually manufactured using a technique called phase inversion. A process called gelation is used. This is where a solution of the polymer is put into water to produce the micro porous membranes. This technique then goes on to produce a skin layer;
