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Liquid Atomic Force Microscopy: Solvation Forces, Molecular Order, and Squeeze-Out

O'Shea, SJ; Gosvami, NN; Lim, LTW; Hofbauer, W; (2010) Liquid Atomic Force Microscopy: Solvation Forces, Molecular Order, and Squeeze-Out. In: JAPANESE JOURNAL OF APPLIED PHYSICS. (pp. ? - ?). JAPAN SOC APPLIED PHYSICS

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Abstract

We review the use of atomic force microscopy (AFM) in liquids to measure oscillatory solvation forces. We find solvation layering can occur for all the liquids studied (linear and branched alkanes) but marked variations in the force and dissipation may arise dependent on: a) the temperature, b) the tip shape/radius of curvature, and c) the degree of molecular branching. Several findings (e.g., the strong temperature dependence in measured solvation forces, solvation oscillations using branched molecules) differ from those observed using the Surface Force Apparatus, because of the nanoscale area probed by AFM. Conduction AFM is used to explore how liquid is squeezed out of the tip sample gap, and enables the change in contact area of the tip sample junction to be monitored and compared to mechanical models. We find elastic models provide a good description of the deformation of ordered, solid-like solvation layers but not disordered, liquid-like layers. (C) 2010 The Japan Society of Applied Physics

Type:Proceedings paper
Title:Liquid Atomic Force Microscopy: Solvation Forces, Molecular Order, and Squeeze-Out
Event:17th International Colloquium on Scanning Probe Microscopy (ICSPM17)
Location:Atagawa Hts, Higashi-izu, JAPAN
Dates:2009-12-10 - 2009-12-12
DOI:10.1143/JJAP.49.08LA01
Keywords:CURVED SOLID-SURFACES, LONG-RANGE ELASTICITY, CONFINED THIN-FILMS, LAYERING TRANSITION, LUBRICATION FILMS, BRANCHED ALKANES, INTERFACES, ADHESION, HEXADECANE, NANOSCALE
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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