Issue 44, 2013

Modification of interfacial forces by hydrophobin HFBI

Abstract

Using a surface force balance, we have measured the forces between bare (hydrophilic) mica surfaces, and between hydrophobized mica surfaces, in each case coated with the amphiphilic protein hydrophobin (HFBI) from Trichoderma reesei. We additionally characterized these surfaces by contact angle measurements and AFM. The results are consistent with the formation of hydrophobic surfaces exposed by HFBI adsorbed on the hydrophilic substrate, and hydrophilic surfaces exposed by HFBI adsorbed on the hydrophobic substrate. In particular, friction between HFBI surfaces on hydrophobized mica, exposing hydrophilic surfaces, is an order of magnitude lower than friction between HFBI-coated hydrophilic surfaces, which expose the hydrophobic side of the protein to the water interface. This result can be readily understood in terms of the greater hydration level of the exposed outer surfaces in the former case.

Graphical abstract: Modification of interfacial forces by hydrophobin HFBI

Article information

Article type
Paper
Submitted
14 Jul 2013
Accepted
04 Sep 2013
First published
09 Oct 2013

Soft Matter, 2013,9, 10627-10639

Modification of interfacial forces by hydrophobin HFBI

I. Goldian, S. Jahn, P. Laaksonen, M. Linder, N. Kampf and J. Klein, Soft Matter, 2013, 9, 10627 DOI: 10.1039/C3SM51924D

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