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Assembly of Colloidal Crystals at Electrode Interfaces M. Trau,*, D. A. Saville, and I. A. Aksay
 

Summary: Articles
Assembly of Colloidal Crystals at Electrode Interfaces
M. Trau,*, D. A. Saville, and I. A. Aksay
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544-5263
Received May 30, 1997. In Final Form: July 18, 1997X
We describe a theory for a new type of colloid behavior whereby particles deposited on a surface by
electrophoresis are manipulated to form two-dimensional crystals. Since the particles are equally charged,
the clustering is opposite that expected from electrostatic considerations. Such behavior is consistent with
migration due to electrohydrodynamic flows associated with polarization layers and ion currents. Provided
colloid stability is maintained, the assembly processes take place with both dc and ac fields and may be
modulated by adjusting the field strength or frequency. No migration is present at frequencies above 1
MHz. Two-dimensional fluid and crystalline states can be formed on the electrode surface. Experiments
with patterned electrodes demonstrate the presence of the electrohydrodynamic flow. A mathematical
model of the electrohydrodynamics provides insight into the assembly process.
Introduction
The fabrication of materials with structural features
on the 1-1000 nm size scale is a rapidly emerging area
in materials science1,2 because nanostructured, multilay-
ered thin film composites (nanolaminates) exhibit proper-

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science