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24 Nov 2003

Volume 83, Issue 21, pp. 4279-4450

Issue Cover Spotlight Figure

Appl. Phys. Lett. 83, 4294 (2003); http://dx.doi.org/10.1063/1.1629140 (3 pages)

Han-Youl Ryu, Masaya Notomi, and Yong-Hee Lee
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Optical trap setup for measuring microtubule pushing forces

J. W. J. Kerssemakers, M. E. Janson, A. van der Horst, and M. Dogterom

Appl. Phys. Lett. 83, 4441 (2003); http://dx.doi.org/10.1063/1.1629796 (3 pages) | Cited 14 times

Online Publication Date: 18 November 2003

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We present an optical trap design for force measurements of polymerizing microtubules. These stiff, filamentous cell components contribute to dynamic processes by generating pushing forces, for example during cell division. Although single traps are widely used for molecular pulling processes, studying pushing by flexible filaments requires extra measures. We introduce multiple, asymmetric traps for directional stabilization and bracing of the microtubules for enhanced rigidity. Our method performs in a force range which was inaccessible so far, namely near the stall force of a polymerizing microtubule. The described methods open the way to the study of other polymerizing biomolecular systems as well. © 2003 American Institute of Physics.
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87.80.Cc Optical trapping
87.16.Ka Filaments, microtubules, their networks, and supramolecular assemblies

Microshaping metal surfaces by wave-directed self-organization

Pil J. Yoo, S. Young Park, S. Joon Kwon, Kahp Y. Suh, and Hong H. Lee

Appl. Phys. Lett. 83, 4444 (2003); http://dx.doi.org/10.1063/1.1630377 (3 pages) | Cited 19 times

Online Publication Date: 18 November 2003

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Self-organization in the shaping of a metal surface is dictated by an internal wave that selects the type of modes from an externally imposed periodic pattern. An elastomeric mold, when placed on a thin bilayer of metal on polymer and heated, provides periodic nodes that give rise to a periodic wave of harmonic series. The internal wave in the bilayer selects the type, number of harmonic modes, and the fractional magnitude that each allowed harmonic mode contributes to the overall surface shape, thereby permitting shape engineering of the metal surface. © 2003 American Institute of Physics.
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81.65.Cf Surface cleaning, etching, patterning
68.35.Gy Mechanical properties; surface strains
81.05.Bx Metals, semimetals, and alloys

A thermodynamic limitation on the maximum speed of wetting of a solid surface by a liquid

Y. X. Gao

Appl. Phys. Lett. 83, 4447 (2003); http://dx.doi.org/10.1063/1.1628821 (3 pages)

Online Publication Date: 18 November 2003

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A thermodynamic formulation is applied to examine the wetting process of a solid surface by a liquid. Attention is focused on the change of the Gibbs free energy of a given gas/liquid/solid system and the moving speed of the contact line on the solid surface. The present study demonstrates that there is a thermodynamic limitation on the wetting speed in a given system. This thermodynamic limitation leads to the verification of the postulate suggested by Blake and Ruschak [Nature (London) 282, 489 (1979)] that there is a maximum speed at which wetting can proceed for the given system. © 2003 American Institute of Physics.
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68.08.Bc Wetting
65.20.-w Thermal properties of liquids
65.40.G- Other thermodynamical quantities
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