Hydrophobization of Track Membrane Surface by Magnetron Sputter Deposition of Ultra-high Molecular Weight Polyethylene

Method for the formation of polymer coatings on the poly(ethylene terephthalate) track-etched membrane surface by magnetron sputter deposition of ultra-high molecular weight polyethylene in a vacuum is considered. The surface morphology and chemical structure of nanoscale coatings have been investigated. It is shown that the application of the ultra-high molecular weight polyethylene-like coatings leads to hydrophobization of the membrane surface, the degree of which depends on the coating thickness. Besides, the usage of this modification method leads to smoothing of structural inhomogeneity of the membrane surface, a decrease in pore diameter, and alteration of pore shape. The investigation of the chemical structure of deposited coatings by XPS method showed that they contain a significant concentration of oxygen-containing functional groups. The composite membranes of the developed sample can be used in the process of desalination of seawater by the method of membrane distillation

Influence of ion charge on primary defects creation in crystals irradiated by ions

The model of primary defects formation under ion irradiation of crystals is described. The model is based on suggestion that defects are created as a result of Coulomb repulsion of neighbouring atoms at crystalline lattice ionized by bombarding ions. The changes of average charge of ions and the charge distribution of ions versus the depth of ion penetration to crystal are taken into account. The results of calculations are presente