Electrophoretic light scattering of linear polyelectrolyte aqueous salt solutions

Abstract

Publication costs assisted by Centre de Recherches sur les MacromoléculesThe electrophoretic mobility of a synthetic, flexible linear polyelectrolyte (an alternating copolymer of maleic acid and ethyl vinyl ether) dissolved in aqueous solutions of NaBr, under various experimental conditions, was measured by inelastic light scattering. We analyzed the influence of the NaBr concentration, the polyacid concentration, the molecular weight of the poly electrolyte, and the degree of neutralization. The results obtained are in agreement with those of previous studies on the subject, but we emphasize the experimental difficulty of obtaining the low polymer concentrations required by limiting laws. An apparent polyion valence was calculated, assuming a Nernst-Einstein relation between the polyion electrophoretic and self-diffusion mobilities. The values obtained were surprisingly low and are discussed in detail.

Electrophoretic evidence for a new type of counterion condensation

“…They reported an onset of condensation consistent with Manning's predictions. A similar electrophoretic light‐scattering study by Meullenet, Schmitt, and Drifford of the alternating copolymer of maleic acid and ethyl vinyl ether reached an ambiguous conclusion in regard to Manning condensation 16. In still another study, Cleland found by electrophoresis no evidence for counterion condensation for variably charged polysaccharides 17.…”

Retention by electrical field-flow fractionation of anions in a new apparatus with annular porous glass channels

“…Even the PSS mobility at infinite dilution is not much larger, because the equivalent conductivity, h, of PSS solutions is almost concentration independent (46), in contrast to the sharp increase in A that is commonly observed as polyelectrolytes are diluted (which promotes increased dissociation of counterions) (41). The diffusion coefficients of PSS also differ by only a factor of 2-3 (assuming equal polymer concentrations) over the molecular-weight-range (1-12) X lo5 g/mol (41,44,49) but, unlike the mobilities, depend strongly on polymer concentration (47-49) and added salt (48). Even though the equations for R and H , given earlier assume the good agreement between these equations and thermal FFF experiments (in which the lateral diffusion coefficient varies with temperature) by assigning to D, the diffusion coefficient corresponding to the temperature of the zone's center of gravity (24).…”

Diffusion quasiélastique de la lumière sous champ électrique : mobilité électrophorétique et charge apparente des macromolécules

“…4 de la réf. [27]), -le PMA (C = 1 g/1) pour des concentrations en NaCI ajouté comprise entre 10-3 et 10-1 M/L (Fig. 7), -l'ADN [4,22], pour les deux échantillons de masses différentes (Fig.…”

“…Appl. 16 (1981) [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] 1981, Classification Physics Abstracts 36.20 -61.25 -78.35 -82. 45 1.…”

“…Les échantillons ont été fournis par le Centre de Recherche des Macromolécules de Strasbourg et étudiés par J. P. Meullenet et al [27]. Les conditions de préparation des échantillons du polymère ainsi que celles des solutions sont précisées dans la référence [28].…”