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28 Dec 2009

Volume 95, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 95, 261901 (2009); http://dx.doi.org/10.1063/1.3268436 (3 pages)

Weiqiang Wang, Richard Clark, Aiichiro Nakano, Rajiv K. Kalia, and Priya Vashishta
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Nonlinear particle behavior during cross-type optical particle separation

Sang Bok Kim, Kyung Heon Lee, Hyung Jin Sung, and Sang Soo Kim

Appl. Phys. Lett. 95, 264101 (2009); http://dx.doi.org/10.1063/1.3276548 (3 pages) | Cited 3 times

Online Publication Date: 28 December 2009

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The effects of varying the ratio of the optical force to the viscous drag force, termed S, on cross-type optical particle separation were investigated experimentally to test previous theoretical predictions. The experiments were performed for various flow velocities, powers of the laser beam, and radii of the laser beam waist and the particles. The behaviors of the particles during optical separation were examined by measuring the retention distances and analyzing the particle trajectories. For small values of S, the particles move with constant velocity in the flow direction and the retention distance increases linearly with S. However, the particles accelerate and decelerate within the laser beam and the retention distance increases nonlinearly with S when S increases further.
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41.85.-p Beam optics

Electrostatically driven droplets deposited on superhydrophobic surfaces

Edward Bormashenko, Roman Pogreb, Tamir Stein, Gene Whyman, and Mordechai Hakham-Itzhaq

Appl. Phys. Lett. 95, 264102 (2009); http://dx.doi.org/10.1063/1.3276697 (2 pages) | Cited 1 time

Online Publication Date: 30 December 2009

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The behavior of dielectric droplets deposited on a superhydrophobic surface and exposed to a constant and uniform electric field is investigated. The change in the droplet shape is described by a linear dependence of its eccentricity on the applied electric field. The proposed control of the droplet shape with the electric field may serve as an alternative to electrowetting technologies.
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47.55.dr Interactions with surfaces
68.08.Bc Wetting

Contact resistance between metal and carbon nanotube interconnects: Effect of work function and wettability

Seong Chu Lim, Jin Ho Jang, Dong Jae Bae, Gang Hee Han, Sunwoo Lee, In-Seok Yeo, and Young Hee Lee

Appl. Phys. Lett. 95, 264103 (2009); http://dx.doi.org/10.1063/1.3255016 (3 pages) | Cited 22 times

Online Publication Date: 31 December 2009

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The contact resistance of 14 different electrode metals with the work function between 3.9 and 5.7 eV has been investigated for carbon nanotube (CNT) interconnects. We observed that the contact resistance was mainly influenced by the two following parameters: the wettability and the work function difference of electrode metal to CNT. Ti, Cr, and Fe with good wettability showed lower resistance than other metals. Furthermore, no dependence of the contact resistance on the work function difference has been observed. However, the contact resistance of Au, Pd, and Pt with poor wettability increased as the work function difference became larger.
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73.40.Cg Contact resistance, contact potential
68.08.Bc Wetting
73.30.+y Surface double layers, Schottky barriers, and work functions
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