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Friction in aqueous media tuned by temperature-responsive polymer layers
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
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2010 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 6, no 11, 2489-2498 p.Article in journal (Refereed)
Abstract [en]

An atomic force microscope colloidal probe technique has been employed to probe normal and friction forces between silica surfaces coated with adsorbed layers of a diblock copolymer of the composition poly(N-isopropylacrylamide)48-block-poly(3-acrylamidopropyl)trimethylammonium chloride)20, abbreviated PNIPAAM48-b-PAMPTMA(+)20. The interactions between the PNIPAAM48-b- PAMPTMA(+)20-coated surfaces across a 0.1 mM NaCl (pH 6) solution at 25 _x0002_C are purely repulsive, due to a combination of steric and electrostatic double-layer forces. However, when the temperature is increased to 35 _x0002_C, and subsequently to 45 _x0002_C, an attractive force develops at short separations due to the unfavourable PNIPAAM–water interaction at these temperatures. The temperature-dependent polymer–water interaction has implications for the friction force between the layers. At 25 _x0002_C a frictional force that increases linearly with increasing load is observed once the surfaces are brought into close contact. At higher temperatures significantly higher friction forces appear as a consequence of attractive segment–segment interactions. Further, a clearly expressed hysteresis between friction forces encountered on loading and unloading is detected. Our results demonstrate that both normal and friction forces between surfaces can be controlled by temperature changes when temperatureresponsive polymers are employed, and friction forces can be adjusted as required from low to high.

Place, publisher, year, edition, pages
2010. Vol. 6, no 11, 2489-2498 p.
Keyword [en]
Friction in aqueous media tuned by temperature-responsive polymer layers
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27482DOI: 10.1039/c003320kOAI: oai:DiVA.org:ri-27482DiVA: diva2:1054487
Note
A2059Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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