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Temperature dependent forces between hydrophobic surfaces coated with ethyl(hydroxyethyl)cellulose
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1990 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 6, p. 1572-1578Article in journal (Refereed)
Abstract [en]

The forces acting between hydrophobic surfaces coated with a layer of noniomic polymer, ethyl-(hydroxyethyl)cellulose (EHEC), were studied inter alia as a function of surface separation and temperature. EHEC adsorbs strongly at hydrophobic surfaces, and the force measurements were performed with a constant adsorbed amount. The force vs distance curves were reversible; i.e., the same forces were measured on approach and separation. The surface interaction is very sensitive to temperature. At room temperature, the forces are purely repulsive. At 44°C (5°C above the cloud point), the force curve remains monotonically repulsive but less long-range. Hence, the EHEC layer contracts due to the poor solvency at this temperature. The fact that no attraction is observed despite that the temperature is above the cloud point is rationalized by considering that the most hydrophilic segements are oriented toward the bulk solution. Consequenyly, the local χ-parameter for the stabilizing moieties is, for this chemically hetereogeneous polymer, different from the average χ-parameter. However, an elastic repulsion, due to the loss of conformational entropy, als contributes significantly to the repulsive force at this temperature. At an even higher temperature (55°C), a strong, but rather short-range, attractive force was observed. The temperature dependence of the force curves was found to be completely reversible at the incubation times used (approximately 15 h).

Place, publisher, year, edition, pages
1990. Vol. 6, p. 1572-1578
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27296OAI: oai:DiVA.org:ri-27296DiVA, id: diva2:1054300
Note
A667Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2017-11-29Bibliographically approved

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