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VOLUME 76, NUMBER 3 P H Y S I C A L R E V I E W L E T T E R S 15 JANUARY 1996 Hydrodynamic Mapping of Two-Dimensional Electric Fields in Monolayers
 

Summary: VOLUME 76, NUMBER 3 P H Y S I C A L R E V I E W L E T T E R S 15 JANUARY 1996
Hydrodynamic Mapping of Two-Dimensional Electric Fields in Monolayers
Pierre Nassoy, William R. Birch, David Andelman,* and Francis Rondelez
Laboratoire de Physico-Chimie des Surfaces et Interfaces, Institut Curie, 11 Rue Pierre et Marie Curie, F-75231 Paris Cedex 05,
France
(Received 10 July 1995)
We have measured the 2D dipolar electric fields generated by surface density fluctuations in Langmuir
monolayers using optical microscopy to monitor the motion of micron-size, electrically charged,
particles trapped at the air-water interface. The particle velocity is directly proportional to the local
electric field gradient. Quantitative agreement with the theory is demonstrated for charged polystyrene
latex particles interacting with liquid condensed domains of pentadecanoic acid. Typical velocities are
of order 0.110 mm s, corresponding to forces in the 10215
10212
N range.
PACS numbers: 68.10.m, 47.65.+a, 82.70.Kj, 87.22.Bt
Despite the key role played by electric fields in numer-
ous interfacial physical and biological phenomena, such
as electrostatic adhesion [1], voltage-gated ion transport
in cell membranes, and nerve impulse propagation [2],
very few attempts to probe the local electric potentials

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics