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28 Apr 2008

Volume 92, Issue 17, Articles (17xxxx)

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Appl. Phys. Lett. 92, 173301 (2008); http://dx.doi.org/10.1063/1.2912822 (3 pages)

Takeo Minari, Masataka Kano, Tetsuhiko Miyadera, Sui-Dong Wang, Yoshinobu Aoyagi, Mari Seto, Takashi Nemoto, Seiji Isoda, and Kazuhito Tsukagoshi
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Analytical solutions for the electric field and dielectrophoretic force in a dielectrophoretic focusing electrode structure

Tao Sun, Nicolas G. Green, and Hywel Morgan

Appl. Phys. Lett. 92, 173901 (2008); http://dx.doi.org/10.1063/1.2916827 (3 pages) | Cited 2 times

Online Publication Date: 2 May 2008

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The analysis of the movement of particles in a nonuniform field requires accurate knowledge of the electric field distribution. In this letter, the Schwarz–Christoffel mapping method is used to analytically solve the electric field distribution in a dielectrophoretic focusing electrode structure. The analytical result for the electric field distribution is validated by comparison with numerical simulations using the finite element method. The electric field solution is used to calculate the dielectrophoretic force on a particle in the system.
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82.45.-h Electrochemistry and electrophoresis

Application of 3C-SiC quantum dots for living cell imaging

J. Botsoa, V. Lysenko, A. Géloën, O. Marty, J. M. Bluet, and G. Guillot

Appl. Phys. Lett. 92, 173902 (2008); http://dx.doi.org/10.1063/1.2919731 (3 pages) | Cited 30 times

Online Publication Date: 2 May 2008

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Highly luminescent, stable, and biocompatible 3C-SiC quantum dots (QDs) with no protective shells have been applied for fluorescence imaging of biological living cells. Structural and luminescent properties of the 3C-SiC QDs are described. Marking of the living cells with such QDs highlights the penetration, accumulation, and heterogeneous distribution of the QDs inside the intracellular space.
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87.63.L- Visual imaging
78.67.Hc Quantum dots

Optical coherence tomography picorheology of biopolymer solutions

Ramesh C. Sharma, Aristeidis Papagiannopoulos, and Thomas A. Waigh

Appl. Phys. Lett. 92, 173903 (2008); http://dx.doi.org/10.1063/1.2917578 (3 pages) | Cited 3 times

Online Publication Date: 2 May 2008

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We describe an interferometric optical fiber based dynamic light scattering technique to study the linear viscoelasticity of complex fluids. This digital correlator based method enables viscoelasticity to be probed at high frequencies (10−2–105 Hz) over picoliter regions of an aqueous sample. We demonstrate the technique using solutions of the self-assembled biological polymers aggrecan and fibrin. The technique is demonstrated in an optical coherence tomography type mode of action with picorheology measurements at 40 μm transverse sections (490 pl volumes) over a 1 cm sample length. The method allowed the viscoelasticity of aggrecan to be probed and provided a direct measurement of the persistence length of the fibrin fibers (Lp = 32±2 cm).
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87.80.-y Biophysical techniques (research methods)
47.80.Jk Flow visualization and imaging
47.57.Qk Rheological aspects
42.81.Wg Other fiber-optical devices
07.60.Ly Interferometers
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