Showing papers by "Vladimir A. Izumrudov published in 2006"
TL;DR: In this article, the authors summarize existing knowledge and present some new results on the relationship between polyelectrolyte multilayer (PEM) growth and phase behavior of PECs in solution.
Abstract: We summarize existing knowledge and present some new results on the relationship between polyelectrolyte multilayer (PEM) growth and phase behavior of polyelectrolyte complexes (PECs) in solution. Detailed understanding of competition between surface and solution as applied to PEMs requires selective labeling of polymers and/or the application of techniques that allow chemically specific monitoring of film components, such as in-situ ATR−FTIR spectroscopy. The trends observed with multilayers directly follow from the properties of PECs in solution. Effects of a number of parameters, such as the type of interacting polyelectrolyte chains, the ratio of their lengths, and ionic strength and pH of deposition solutions, on the likelihood of the multilayer stability or erosion are considered. Polycations with high density of primary amino groups and polyanions with SO3- or SO4- groups show the strongest interpolyelectrolyte binding, resulting in inhibited chain exchange within PECs and/or PEMs. With weakly boun...
267 citations
TL;DR: The polycation-grafted monolithic columns are able to capture plasmid DNA directly from alkaline lysate of Escherichia coli cells and was eluted with 1M NaCl as particulate-free preparation with significantly reduced content of protein and RNA as compared to the applied lysates.
78 citations
TL;DR: Salt-induced phase separations in solutions of water soluble non-stoichiometric polyelectrolyte complexes (WPECs) formed by poly(N-ethyl-4-vinylpyridinium) polycation with different polyanions – sodium poly(methacrylate), sodiumpoly(styrenesulfonate), and DNA – have been explored.
21 citations
TL;DR: In this article, the existence of insoluble polyelectrolyte complexes in solutions of nonequimolar mixtures of quaternary polyamines and polycarboxylates of various degrees of polymerization has been determined with turbidimetric titration.
Abstract: Boundaries of the existence of insoluble polyelectrolyte complexes in solutions of nonequimolar mixtures of quaternary polyamines and polycarboxylates of various degrees of polymerization have been determined with turbidimetric titration It has been shown that in salt-free media the position of critical points expressed as the ratio between the charge numbers of polymer components in a mixture depends on the chemical nature of the host polyelectrolyte (polycation or polyanion) but does not depend on either the nature of the guest polyelectrolyte or the degree of polymerization of mixture components Upon addition of a low-molecular-mass polyelectrolyte, the heterogeneous region widens The shorter the host polyelectrolyte relative to the guest polyelectrolyte, the more pronounced this effect Based on the thermodynamic state of the systems under examination, an explanation of this effect is confirmed by the velocity sedimentation data
18 citations
2 citations