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15 Apr 2002

Volume 80, Issue 15, pp. 2625-2806

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Coulomb motor by rotation of spherical conductors via the electrostatic force

Anders O. Wistrom and Armik V. M. Khachatourian

Appl. Phys. Lett. 80, 2800 (2002); http://dx.doi.org/10.1063/1.1470259 (2 pages) | Cited 2 times

Online Publication Date: 10 April 2002

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Show Abstract
Three spherical conductors fixed in space and held at constant potential produces a rotational force that causes the conductors to rotate about their axis. The motor is described by an expression for the moment of force given by Coulomb’s law complemented by Gauss’ law of the electric potential. The observed rotation is likely to be general and apply to machines of all size scales where the electrostatic force is the dominant operative force. This would include systems ranging in size from molecular to macroscopic and be useful for devices that require rotational motion. © 2002 American Institute of Physics.
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41.20.Cv Electrostatics; Poisson and Laplace equations, boundary-value problems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Biomimetic self-assembly of helical electrical circuits using orthogonal capillary interactions

David H. Gracias, Mila Boncheva, Osahon Omoregie, and George M. Whitesides

Appl. Phys. Lett. 80, 2802 (2002); http://dx.doi.org/10.1063/1.1470222 (3 pages) | Cited 12 times

Online Publication Date: 10 April 2002

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This letter describes the biomimetic self-assembly of mm-sized polyhedra into helical aggregates. The system used two orthogonal, capillary interactions that acted in parallel. The design of the self-assembly process, and of the resulting structures, was modeled on the formation and structure of tobacco mosaic virus. The self-assembled, helical aggregates carried one, two, or four isolated, electrical circuits. © 2002 American Institute of Physics.
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85.65.+h Molecular electronic devices
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