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  Influence of molecular dipole orientations on long-range exponential interaction forces at hydrophobic contacts in aqueous solutions

Kristiansen, K., Stock, P., Baimpos, T., Raman, S., Harada, J. K., Israelachvili, J. N., et al. (2014). Influence of molecular dipole orientations on long-range exponential interaction forces at hydrophobic contacts in aqueous solutions. ACS Nano, 8(10), 10870-10877. doi:10.1021/nn504687b.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-B4F2-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-B4F3-7
Genre: Journal Article

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 Creators:
Kristiansen, Kai1, Author              
Stock, Philipp2, Author              
Baimpos, Theodoros2, Author              
Raman, Sangeetha2, Author              
Harada, Jaye K.3, Author              
Israelachvili, Jacob N.4, 5, Author              
Valtiner, Markus2, Author              
Affiliations:
1Department of Chemical Engineering, University of California, Santa Barbara, CA, USA, ou_persistent22              
2Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863357              
3Materials Research Laboratory, University of California, Santa Barbara, CA, USA, ou_persistent22              
4Department of Chemical Engineering, University of California, Santa Barbara, CA 93106-5080, USA, ou_persistent22              
5Materials Department, University of California, Santa Barbara, CA, USA, ou_persistent22              

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Free keywords: hydrophobic; molecular dipole; self-assembled monolayer; surface forces apparatus
 Abstract: Strong and particularly long ranged (>100 nm) interaction forces between apposing hydrophobic lipid monolayers are now well understood in terms of a partial turnover of mobile lipid patches, giving rise to a correlated long-range electrostatic attraction. Here we describe similarly strong long-ranged attractive forces between self-assembled monolayers of carboranethiols, with dipole moments aligned either parallel or perpendicular to the surface, and hydrophobic lipid monolayers deposited on mica. We compare the interaction forces measured at very different length scales using atomic force microscope and surface forces apparatus measurements. Both systems gave a long-ranged exponential attraction with a decay length of 2.0 +/- 0.2 nm for dipole alignments perpendicular to the surface. The effect of dipole alignment parallel to the surface is larger than for perpendicular dipoles, likely due to greater lateral correlation of in-plane surface dipoles. The magnitudes and range of the measured interaction forces also depend on the surface area of the probe used: At extended surfaces, dipole alignment parallel to the surface leads to a stronger attraction due to electrostatic correlations of freely rotating surface dipoles and charge patches on the apposing surfaces. In contrast, perpendicular dipoles at extended surfaces, where molecular rotation cannot lead to large dipole correlations, do not depend on the scale of the probe used. Our results may be important to a range of scale-dependent interaction phenomena related to solvent/water structuring on dipolar and hydrophobic surfaces at interfaces.

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Language(s): eng - English
 Dates: 2014-10-28
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000343952600125
DOI: 10.1021/nn504687b
 Degree: -

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Title: ACS Nano
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 8 (10) Sequence Number: - Start / End Page: 10870 - 10877 Identifier: ISSN: 1936-0851
CoNE: /journals/resource/1936-0851