国产一级a毛一级a看免费视频,久久久久久国产一级AV片,免费一级做a爰片久久毛片潮,国产精品女人精品久久久天天,99久久久无码国产精品免费了

 作者：D. D. Fazullin, G. V. Mavrin, I. A. Nasyrov, I. G. Shaikhiev 

Kazan Federal University, Naberezhnye Chelny Institute

 

摘要：For the separation of water-oil emulsions, this paper deals with the promising methods for modifying the surface of a microfiltration membrane by applying a dynamic layer of PTFE, which allows changing the surface properties of these materials and separating efficiently water-oil emulsions. Dynamic membranes of "nylon-polytetrafluoroethylene" (nylon-PTFE) are obtained by applying polytetrafluoroethylene particles of 0.9 to 262 nm on the nylon membrane surface. An increase in the membrane contact angle measured with a distilled water drop was from 59.6º to 115.6º as a result of the applying PTFE particles on the surface of the initial membrane. It was determined that the membrane surface becomes hydrophobic after the modification. After applying a layer of PTFE on the surface of the nylon membrane, the specific productivity of the latter decreases 6 to 10 times due to the intensive accumulation of PTFE particles in the pores and surface of the membrane. It was also revealed that the specific productivity of the nylon-PTFE membrane after washing with the detergent solution recovers better as compared with the initial values than the original membrane, due to hydrophobic property of the surface. Modification of the membrane leads to an increase in the degree of removal of petroleum products from the oil-in-water emulsion up to 53%, based on the amount of PTFE applied to the surface.