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  Developing a general interaction potential for hydrophobic and hydrophilic interactions

Donaldson Jr., S. H., Røyne, A., Kristiansen, K., Rapp, M. V., Das, S. K., Gebbie, M. A., et al. (2015). Developing a general interaction potential for hydrophobic and hydrophilic interactions. Langmuir, 31(7), 2051-2064. doi:10.1021/la502115g.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-BAA9-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-BAAA-E
Genre: Journal Article

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 Creators:
Donaldson Jr., Stephen H.1, Author              
Røyne, Anja2, Author              
Kristiansen, Kai3, Author              
Rapp, Michael V.3, Author              
Das, Saurabh K.3, Author              
Gebbie, Matthew A.4, Author              
Lee, Dongwoog3, Author              
Stock, Philipp5, Author              
Valtiner, Markus5, Author              
Israelachvili, Jacob N.1, 6, Author              
Affiliations:
1Department of Chemical Engineering, University of California, Santa Barbara, CA 93106-5080, USA, ou_persistent22              
2Department of Physics, University of Oslo, Oslo, Norway, ou_persistent22              
3Department of Chemical Engineering, University of California, Santa Barbara, CA, USA, ou_persistent22              
4Materials Department, University of California, Santa Barbara, CA 93116, USA, ou_persistent22              
5Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863357              
6Materials Department, University of California, Santa Barbara, CA, USA, ou_persistent22              

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Free keywords: Cationic surfactants; Hydration; Hydrophilicity; Hydrophobic chromatography; Lipid bilayers; Mica; Silicate minerals; Surface chemistry; Van der Waals forces; Derjaguin-Landau-Verwey-Overbeek theories; Direct force measurements; Electrostatic double layer; Hydrophobic and hydrophilic; Hydrophobic and hydrophilic interactions; Hydrophobic interactions; Hydrophobic monolayers; Surface forces apparatus
 Abstract: We review direct force measurements on a broad class of hydrophobic and hydrophilic surfaces. These measurements have enabled the development of a general interaction potential per unit area, W(D) = -2 gamma(i)Hy exp(-D/D-H) in terms of a nondimensional Hydra parameter, Hy, that applies to both hydrophobic and hydrophilic interactions between extended surfaces. This potential allows one to quantitatively account for additional attractions and repulsions not included in the well-known combination of electrostatic double layer and van der Waals theories, the so-called Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The interaction energy is exponentially decaying with decay length D-H approximate to 0.3-2 nm for both hydrophobic and hydrophilic interactions, with the exact value of D-H depending on the precise system and conditions. The pre-exponential factor depends on the interfacial tension, gamma(i), of the interacting surfaces and Hy. For Hy > 0, the interaction potential describes interactions between partially hydrophobic surfaces, with the maximum hydrophobic interaction (i.e., two fully hydrophobic surfaces) corresponding to Hy = 1. Hydrophobic interactions between hydrophobic monolayer surfaces measured with the surface forces apparatus (SFA) are shown to be well described by the proposed interaction potential. The potential becomes repulsive for Hy < 0, corresponding to partially hydrophilic (hydrated) interfaces. Hydrated surfaces such as mica, silica, and lipid bilayers are discussed and reviewed in the context of the values of Hy appropriate for each system.

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Language(s): eng - English
 Dates: 2015-02-24
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000350192400001
DOI: 10.1021/la502115g
 Degree: -

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Title: Langmuir
Source Genre: Journal
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Publ. Info: Columbus, OH : American Chemical Society
Pages: - Volume / Issue: 31 (7) Sequence Number: - Start / End Page: 2051 - 2064 Identifier: ISSN: 0743-7463
CoNE: /journals/resource/954925541194