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  • Title: Lateral hydrodynamic interactions between an emulsion droplet and a flat surface evaluated by frictional force microscopy.
    Author: Vakarelski IU, Dagastine RR, Chan DY, Stevens GW, Higashitani K, Grieser F.
    Journal: Langmuir; 2010 Jun 01; 26(11):8002-7. PubMed ID: 20334399.
    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.
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