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Force measurements between semifluorinated thiolate self-assembled monolayers: Long-range hydrophobic interactions and surface charge
Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Stockholm, SE-100 44, Sweden, Institute for Surface Chemistry, Box 5607, Stockholm, SE-114 86, Sweden.
National Institute of Materials and Chemical Research (NIMC), Tsukuba, Ibaraki, 305-8565, Japan.
Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Stockholm, SE-100 44, Sweden, Institute for Surface Chemistry, Box 5607, Stockholm, SE-114 86, Sweden.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
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2001 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 235, no 2, 391-397 p.Article in journal (Refereed) Published
Abstract [en]

Long-range interactions between self-assembled monolayers (SAMs) of semifluorinated alkanethiols have been studied by direct force measurements in water and aqueous NaCl solutions. SAMs prepared from three different thiols, with identical fluorinated head groups but varying hydrocarbon spacer lengths, were investigated: CF3(CF2)9(CH2)xSH, where x = 2, 11, or 17. Force measurements show that the interactions in water and electrolyte solutions are composed of both double-layer interactions emerging from what appears to be charges adsorbed onto the surfaces and long-range "hydrophobic" attractions, in excess of the expected van der Waals forces. The three investigated thiols produce similar results in force measurements, though the contact angles with water are slightly different. The "hydrophobic" attraction has the form of step-like attractive discontinuities in the force profiles at separations ranging from 20 to 40 nm, caused by bridging of microscopic bubbles residing at the surfaces. The shape or range of these discontinuities are not significantly affected by replacement of the water with either 1 mM or 1 M NaCl solutions. The origin of the charges causing the electrostatic double-layer interaction is unclear, but some possible causes are discussed. © 2001 Academic Press.

Place, publisher, year, edition, pages
2001. Vol. 235, no 2, 391-397 p.
Keyword [en]
Flourocarbons, Hydrophobic interaction, Interfacial charge, Ion adsorption, Self-assembled monolayers, Surface forces
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47439DOI: 10.1006/jcis.2000.7318OAI: oai:DiVA.org:liu-47439DiVA: diva2:268335
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Valiokas, Ramunas

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