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Authors
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Sergeeva, I. P. ; Ermakova, T. ; Churaev, N. V. ; Grundke, K. ; Yudin, A.
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Title
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Modification of the Quartz Surface by the Adsorption of a Cationic Polyelectrolyte
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Date
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31.12.2002
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Number
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13377
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Abstract
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A capillary electrokinetics method is applied to measure the electrokinetic potential of the surface of quartz capillaries during the continuous flow of the aqueous solutions of a cationic polyelectrolyte (PE). At a low polymer concentration (105 g/l), the adsorption is determined mainly by the electrostatic forces and its kinetics, by the conformational rearrangement of adsorbed macromolecules. As the concentration of PE increases, the charge of quartz surface reverses; and further adsorption is due to the forces of hydrophobic and molecular attraction between macromolecules. The adsorption energy is estimated for this case. The charge reversal of the surface is associated with the presence of adsorption sites of two different types. At a low concentration of PE, the adsorption takes place on negatively charged sites of quartz surface. At higher concentrations of PE, after the neutralization of the surface, the adsorbed PE molecules become new adsorption sites, and the adsorption acquires two-layer character. After adsorption, the quartz surface is hydrophobized: the contact angle measured by the bubble method is close to 33°34°.
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Publisher
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Colloid Journal
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Wikidata
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Citation
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Colloid Journal 64 (2002) 478-481
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DOI
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https://doi.org/10.1023/A:1016876105595
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Tags
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