Lateral hydrodynamic interactions between an emulsion droplet and a flat surface evaluated by frictional force microscopy

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Title: Lateral hydrodynamic interactions between an emulsion droplet and a flat surface evaluated by frictional force microscopy
Author(s): Vakarelski, Ivan U.; Dagastine, Raymond R.; Chan, Derek Y. C.; Stevens, Geoffrey W.; Higashitani, Ko; Grieser, Franz
Abstract: We introduce a lateral atomic force microscopy (AFM) method to measure the hydrodynamic drag force acting on a microscopic emulsion droplet moving parallel to a flat surface. A tetradecane oil droplet formed in an aqueous solution of sodium dodecylsulfate was attached to a V-shaped atomic force microscopy cantilever, and lateral hydrodynamic interactions between the droplet and a flat glass surface were measured using a range of scanning velocities. The droplet was positioned either far from the oscillating surface or was pressed to the surface under a constant applied load. These measurements demonstrate the feasibility of using AFM to study lateral hydrodynamic interactions and lubricity between soft matter materials relevant to a large number of applications in areas as diverse as flavor delivery in foods to the applications of emulsions or emollients in personal care products.
Publication type: Journal article
Source: Langmuir, Vol. 26, no. 11 (Jun 2010), pp. 8002-8007
Publication year: 2010
FOR Code(s): 0306 Physical Chemistry (Incl. Structural)
Keyword(s): AFM; Atomic force/methods; Atomic force microscope; Emulsions; Microscopy
Publisher: American Chemical Society
ISSN: 0743-7463
Publisher URL: http://dx.doi.org/10.1021/la904894n
Peer reviewed