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Science 30 January 2004:
Vol. 303. no. 5658, pp. 652 - 655
DOI: 10.1126/science.1092608
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Reports

Elastic Torque and the Levitation of Metal Wires by a Nematic Liquid Crystal

C. Lapointe, A. Hultgren, D. M. Silevitch, E. J. Felton, D. H. Reich, R. L. Leheny

Anisotropic particles suspended in a nematic liquid crystal disturb the alignment of the liquid crystal molecules and experience small forces that depend on the particles' orientation. We have measured these forces using magnetic nanowires. The torque on a wire and its orientation-dependent repulsion from a flat surface are quantitatively consistent with theoretical predictions based on the elastic properties of the liquid crystal. These forces can also be used to manipulate submicrometer-scale particles. We show that controlled spatial variations in the liquid crystal's alignment convert the torque on a wire to a translational force that levitates the wire to a specified height.

Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 USA.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Shape-Controlled Colloidal Interactions in Nematic Liquid Crystals.
C. P. Lapointe, T. G. Mason, and I. I. Smalyukh (2009)
Science 326, 1083-1086
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Science. ISSN 0036-8075 (print), 1095-9203 (online)