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Controlled formation of colloidal structures by an alternating electric field and its mechanisms
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10.1063/1.3127383
/content/aip/journal/jcp/130/18/10.1063/1.3127383
http://aip.metastore.ingenta.com/content/aip/journal/jcp/130/18/10.1063/1.3127383
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The schematic of the experimental setup. The colloidal suspension is sandwiched between two ITO-coated glass plates separated by insulating spacers. The thickness between the two electrodes is , with the center line at .

Image of FIG. 2.
FIG. 2.

Phase diagram and typical colloidal patterns induced by an AEF. (a) A 2D colloidal crystal (△) at and . (b) 3D aggregation of colloidal particles , as captured by the SCM at and . (c) Static snapshot of colloidal chains (×) by the SCM at and . (d) Snapshot of oscillatory vortex rings (●) at and . (e) The isotropic liquid state of colloidal suspension . Scale bars represent in (b) and (c) and they represent in (a), (d), and (e), respectively.

Image of FIG. 3.
FIG. 3.

The distribution of the dimensionless field strength between parallel electrodes induced by an external AEF at various frequencies, at . (a) Ultralow frequency . Inset shows the potential distribution in the cell. (b) . (c) The changes of the electric field strength in the vicinity of the PLs at different frequency, 0.01, 0.1, 1.0, 5.0, and 10.0 kHz (, , ). The ratio of the thickness of PLs and Debye length against the logarithm of the frequency is plotted in the inset and fit by the straight line (thickness is the height where the strength becomes constant outside the PLs).

Image of FIG. 4.
FIG. 4.

The measurement of the lateral velocities of the particles induced by the EHD flow at different frequencies and strengths. (a) The trajectory of a moving fluorescent particle. (b) Dependence of lateral velocity on the inverse frequency. The dotted curve is the best linear fit for , i.e., (dashed line). (c) Dependence of lateral velocity on field strength. The dotted line is the best power fit with an exponent of and the solid line is a drawing of the square power law.

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/content/aip/journal/jcp/130/18/10.1063/1.3127383
2009-05-12
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Controlled formation of colloidal structures by an alternating electric field and its mechanisms
http://aip.metastore.ingenta.com/content/aip/journal/jcp/130/18/10.1063/1.3127383
10.1063/1.3127383
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