Mixed adsorption layers of uncharged polymers at particle/solution interfaces

F. Csempesz, Katalin F. Csáki

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Simultaneous competitive adsorption from binary mixtures of uncharged polymers on negatively charged colloidal dispersions and the structure of polymer layers formed at particle/solution interfaces were studied. From the adsorption isotherms determined in competitive adsorption at equal concentrations of two polymers in the bulk solution, preferential adsorption parameters for the polymers in pairs have been established, and used as a measure of the affinity of chemically different macromolecules for the solid surfaces. The diffusion coefficient of (monodisperse) particles with and without adsorbed polymer was measured by photon correlation spectroscopy, and the hydrodynamic thickness of adsorbed polymer layers has been calculated. The exchange of polymeric species adsorbed at the interfaces was detected by measuring the thicknesses of mixed layers after various contact times. The preferential adsorption parameters proved to be relevant markers for the various interfacial processes. Simultaneous adsorption onto particle surfaces of polymers with significantly different segment affinities resulted in considerable alterations in the structure of mixed adsorption layers. Close correlation was found between the affinity of the competing macromolecules and the spatial properties of mixed layers. From suitable polymer pairs, at partial surface coverages where enough surface sites were available for the various macromolecules, irregularly extended adsorption layers formed. At high surface coverages, the preferentially adsorbed species displaced the weakly adsorbed polymers from the interfaces.

Original languageEnglish
Pages (from-to)5917-5920
Number of pages4
JournalLangmuir
Volume16
Issue number14
DOIs
Publication statusPublished - Jul 11 2000

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Polymers
Adsorption
adsorption
polymers
Macromolecules
macromolecules
affinity
Photon correlation spectroscopy
Binary mixtures
Dispersions
Adsorption isotherms
solid surfaces
markers
binary mixtures
isotherms
Hydrodynamics
diffusion coefficient
hydrodynamics
photons
spectroscopy

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Mixed adsorption layers of uncharged polymers at particle/solution interfaces. / Csempesz, F.; Csáki, Katalin F.

In: Langmuir, Vol. 16, No. 14, 11.07.2000, p. 5917-5920.

Research output: Contribution to journalArticle

Csempesz, F. ; Csáki, Katalin F. / Mixed adsorption layers of uncharged polymers at particle/solution interfaces. In: Langmuir. 2000 ; Vol. 16, No. 14. pp. 5917-5920.
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