Isotropic compression of colloidal crystal in electric field between plate electrode

Li Xiao-Long; Lu Ying; Zhai Yong-Liang; Wu Lan-Sheng; Sun Wei; Hu Shu-Xin

doi:10.7498/aps.62.176105

Abstract

Colloidal crystals composed of polystyrene micro-spheres (negatively charged, with a diameter of 300 nm) are fabricated by injecting aqueous suspensions of the micro-spheres with different volume fractions into sample cells which are made by gluing together two glass plates. Whose surfaces are coated with conductive films. The colloidal crystals have a face-centered-cubic structure with their (111) planes parallel to the surface of the sample cells. Laser diffraction is used to measure the structural changes of the colloidal crystals in an electric field. Structures of the colloidal crystals are characterized by using the Kossel-line method. It is found that the colloidal crystals are compressed isotropically in the electrical field. The lattice constants of the colloidal crystals decrease with the increase of the electric field, maintaining their face-centered-cubic structure. Results can be explained by the combined action of the electric field force, electrostatic repulsion and electrohydrodynamic force. The electric field makes all of the micro-spheres migrate to the positive plate of the sample cell and leads to a compression in the direction along the electric field. Then the electrohydrodynamic force produces an attractive interaction between the micro-spheres in the direction perpendicular to the electric field.

Keywords:

Authors and contacts

1.
Institute of Microstructure and Property of Advanced Material, Beijing University of Technology, Beijing 100124, China;
2.
Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Funds: Project supported by the China Manned Space Engineering, and the National Natural Science Foundation of China (Grant Nos. 10904164, 11104328).

References

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Cited By

[1]	Chen Y 2003 Chin. Phys. Lett. 20 1626
[2]	Li F J, Hong X G, Dong B Z 2003 Chin. Phys. 12 771
[3]	Pushkar P L, Manish Mittal, Furst E M 2008 Langmuir. 24 12842
[4]	Tae Soup Shim, Shin-Hyun Kim 2010 Adv. Mater. 22 4494
[5]	Richetti P, Barois P J 1984 Phys. Lett. 45 1137
[6]	Trau M, Saville D A, Aksay I A 1997 Langmuir. 13 6375
[7]	Han Y L, Grier D G 2005 J. Chem. Phys. 122 164701
[8]	Li C R, Li S W 2011 Chin. Phys. B 20 078102
[9]	Kossel W, Voges H 1935 Ann. Phys. (Leipzig) 23 677
[10]	Clark N A, Hurd A J, Ackerson B J 1979 Nature 281 57
[11]	Arora A K, Tata B V R 2003 Ordering and Phase Transitions in Charged Colloids (New York: VCH Publishers, Inc) p51
[12]	Tadatomi Shinohara, Hisashi Yamada 2004 Langmuir 20 5141
[13]	Tadatomi Shinohara, Tsuyoshi Yoshiyama 2001 Langmuir 17 8010

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Catalog

Vol. 62, Issue 17 - 2013-09-05

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