Microporous polymeric flat-sheet

The experimental results reported in this chapter are related to membrane contactors manufactured by GVS S.P.A by using microporous polymeric flat-sheet... 

Composite Nonporous barrier on microporous substrate Flat-sheet, hollow fiber Direct coating, interfacial polymerization, plasma polymerization Reverse osmosis, gas separation, perstraction... 

Microfilters differ from ultrafilters primarily in the pore size range and construction of the membranes used to achieve a separation. The polymeric, flat sheet types are usually of a symmetric construction and exhibit either microporous or track-etched forms to facilitate either depth or surface filtration. These membranes are manufactured with pore ratings of 0.02-10 pm. 

A separator is a porous membrane placed between electrodes of opposite polarity, permeable to ionic flow but preventing electric contact of the electrodes. A variety of separators have been used in batteries over the years. Starting with cedar shingles and sausage casing, separators have been manufactured from cellulosic papers and cellophane to nonwoven fabrics, foams, ion exchange membranes, and microporous flat sheet membranes made from polymeric materials. As batteries have become more sophisticated, separator function has also become more demanding and complex. 

Membranes are polymeric microporous materials in hollow-fiber or flat-sheet configurations. The membrane properties control the contactor and the membrane contactor system performance and economy. The most important membrane properties are ... 

CMS manhranes are composed of microporous carbon (as libers, on tubes or flat sheets) prepared from carbonization of polymeric precursors under controlled conditions. Precursors that are mostly used are cellulose or Pis. Depending on the manbrane pore size and the process conditions, separation may take place according to (1) molecular sieving < 5 A), (2) selective surface flow (5 A < < 12 A), (3) Knudsen diffusion... 

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