Adsorption of ions onto polymer surfaces and its influence on zeta potential and adhesion phenomena |
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Authors: | H-J Jacobasch F Simon P Weidenhammer |
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Institution: | (1) Institute of Polymer Research Dresden P.O. Box 120411 D-01005 Dresden Germany, DE |
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Abstract: | The adhesion behavior that governs many technologically and biologically relevant polymer properties can be investigated
by zeta potential measurements with varied electrolyte concentration or pH. In a previous work 1] it was found that the difference
of the adsorption free energies of Cl- and K+ ions correlates with the adhesion force caused by van der Waals interactions, and that the decrease of adhesion strength
by adsorption layers can be elucidated by zeta potential measurements. In order to confirm these interrelations, zeta potential
measurements were combined with atomic force microscopy (AFM) measurements. Force–distance curves between poly(ether ether
ketone) and fluorpolymers, respectively, and the Si3N4 tip of the AFM device in different electrolyte solutions were measured and analysed. The adsorption free energy of anions
calculated from the Stern model correlates with their ability to prevent the adhesion between the polymer surface and the
Si3N4 tip of the AFM device. These results demonstrate the influence of adsorption phenomena on the adhesion behavior of solids.
The results obtained by AFM confirm the thesis that the electrical double layer of solid polymers in electrolyte solutions
is governed by ion adsorption probably due to van der Waals interactions and that therefore van der Waals forces can be detected
by zeta potential measurements.
Received: 18 November 1997 Accepted: 19 January 1998 |
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Keywords: | zeta potential atomic force microscopy X-ray photoelectron spectroscopy adhesion dispersion forces ion adsorption |
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