Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/190510

Title

Measurement of dynamical forces between deformable drops using the atomic force microscope I: theory

Author(s)

Carnie, Steven L.;  Chan, Derek Y. C.;  Lewis, Craig;  Manica, Rogerio;  Dagastine, Raymond R.

Abstract

Recent experimental developments have enabled the measurement of dynamical forces between two moving liquid drops in solution using an atomic force microscope (AFM). The drop sizes, interfacial tension, and approach velocities used in the experiments are in a regime where surface forces, hydrodynamics, and drop deformation are all significant. A detailed theoretical model of the experimental setup which accounts for surface forces, hydrodynamic interactions, droplet deformation, and AFM cantilever deflection has been developed. In agreement with experimental observations, the calculated force curves show pseudo-constant compliance regions due to drop flattening, as well as attractive pull-off forces due mainly to hydrodynamic lubrication forces.

Publication type

Journal article

Source

Langmuir, Vol. 21, no. 7 (Mar 2005), pp. 2912-2922

Publication year

2005

FOR Code(s)

0306 Physical Chemistry (Incl. Structural);  0904 Chemical Engineering

Keyword(s)

Atomic force microscopy;  Brownian movement;  Buoyancy;  Deformation;  Drag;  Drop breakup;  Free energy;  Geometry;  Hydrodynamics;  Mathematical models;  Surface active agents;  Surface tension;  Thin films;  Velocity control;  Viscosity;  Deformable drops;  Droplet deformation;  Dynamical forces;  Hydrodynamic repulsion;  Force measurement

Publisher

American Chemical Society

ISSN

0743-7463

Publisher URL

http://dx.doi.org/10.1021/la0475371

Copyright

Copyright © 2005 American Chemical Society.

Peer reviewed