Study of electrokinetic properties of segmented capillary columns with neutral and negatively charged polymer sorbents

Structure and trends of surface energy changes in model polymer coatings on fused silica are studied and electrokinetic properties are characterized for hollow segmented fused silica columns (SFSC) coated with atactic polystyrene and poly(styrenesulfonic acid) as non-polar and negatively charged segments with the ratios of their lengths 2:1 and 1:2. SFSC are shown to provide a high electroosmotic flow (EOF) almost independent on pH value of electrolyte solutions. Electrokinetic mobility of EOF marker (dimethylsulfoxide) in the studied columns is determined by the ratio of lengths between electricallyt neutral and negatively charged polymer sorbents.