Types of membranes and the structure of the synthetic Membrane can be created from a large number of different materials. Can be used from organic or inorganic materials including solids such as metal or ceramic, homogenous films (polymers), heterogeneous solids (polymeric mixes, mixed glasses) and liquids. Ceramic membranes are made from inorganic materials such as aluminum oxide, silicon carbide and zirconium dioxide. Ceramic membranes are very resistant to exposure to aggressive media (acids, strong solvents). They are very stable, chemically, thermally, mechanically and biologically inert. Even though ceramic membranes have significant production costs and the high weight, are environmentally friendly and have a long lifetime. Ceramic membranes are generally claim as the monolithic shape tubular capillaries. Liquid membrane refers to synthetic membranes from-rigid material. Several types of liquid membranes may meet in the industry: emulsion liquid membranes, immobilized (supported) liquid membranes, molten salts and hollow fiber contained liquid membranes. Liquid membranes are studied extensively but have limited commercial applications. Polymeric membranes lead the Membrane separation industry market, because they are unrivalled performance and economics. Many polymers are available, but the choice of membrane polymer is not a trivial task. Polymer have appropriate properties for the intended use. Polymer, offers low affinity binding for the separate molecules (as in the case of biotechnological applications) and must withstand harsh cleaning. It must be compatible with the selected membrane technologies, invention. The polymer must be a suitable Membrane former in terms of its chains rigidity, chain interactions, stereoregularity, and polarity of its functional groups. Polymers can form amorphous and semicrystalline structures (can also have other glass transition temperature), affecting the performance characteristics of the membrane. The polymer must be practicable and consistent with the low-cost Membrane separation criteria for reasonable prices. Many Membrane polymers grafted, custom prepared or are produced as copolymers to improve their properties. The most common polymers in membrane synthesis are nitrates, cellulose and esters (CA, CN and CE), polysulfone (PS), polyether sulfone (PES), polyacrilonitrile (PAN), polyamide, polyimide, polyethylene and polypropylene (PE and PP), polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), Nástrčné couplings (PVC). Polysulfone (PS), polyethylene (PE) of granular polytetrafluoroethylene (PTFE), polypropylene (PP) surface chemistry contact angle of a liquid droplet on solid surface with fixed.Young's equation: LG os + DM = SG. One of the critical characteristics of a synthetic membrane is its chemistry. Synthetic Membrane chemistry usually refers to the chemical nature and the composition of its surface in contact with the stream of the process of separation. Chemical nature of the surface of the membrane may be quite different from the composition of the mass. This difference can be derived from the material of the partitions in a certain stage of Membrane fabrication, or the intended surface postformation modification. Surface chemistry membrane forms a very important properties, such as hydrofilicitu or hydrophobicity (relates to the surface free energy), the presence of ionic charges, Membrane chemical or thermal resistance, binding affinity for particles in solution and biocompatibility (in the case of bioseparations). Hydrofilicitu and hydrophobicity of the membrane surfaces can be expressed in terms of water (liquid) contact angle. Hydrophilic membrane surfaces have contact angle in the range of 0 ° c
We are suppliers of high quality, our products, such as China, slitter slitter China for oversee to buyer. If you want to know more, please visit steel prevalence.
Related articles-China, China, slitter slitter
Send this article to your friends!
Accept articles like this one directly to your e-mail Inbox!Subscribe for free!
No comments:
Post a Comment