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28 May 2012

Volume 100, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 100, 222402 (2012); http://dx.doi.org/10.1063/1.3700809 (4 pages)

Felix Balhorn, Simon Jeni, Wolfgang Hansen, Detlef Heitmann, and Stefan Mendach
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Crystalline order of polymer nanoparticles over large areas at solid/liquid interfaces

M. S. Hellsing, V. Kapaklis, A. R. Rennie, A. V. Hughes, and L. Porcar

Appl. Phys. Lett. 100, 221601 (2012); http://dx.doi.org/10.1063/1.4723634 (4 pages)

Online Publication Date: 29 May 2012

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We report on the formation of large two-dimensional domains (about 20 cm2) of oriented and ordered structures of polystyrene particles dispersed in water at a solid/liquid interface. Gentle flow of the dispersed sample into the holder at a shear strain rate of about 0.1 s−1 caused particles at the air/latex meniscus to self-assemble in a regular structure on both solid silica or alumina surfaces. Scattering experiments show that the particle separation at the surface was the same as in the bulk and determined by repulsion arising from the charges on the particles. Close-packed planes formed parallel to the interface.
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61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
61.41.+e Polymers, elastomers, and plastics
81.16.Dn Self-assembly

Electrophoretic motion of a charged water droplet near an oil-air interface

Dong Woog Lee, Do Jin Im, and In Seok Kang

Appl. Phys. Lett. 100, 221602 (2012); http://dx.doi.org/10.1063/1.4723633 (4 pages) | Cited 4 times

Online Publication Date: 30 May 2012

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The trajectory of a charged droplet near an oil-air interface is investigated. When a charged droplet is translated in oil by electrophoresis, the droplet follows a straight line between two electrodes. However, if an oil-air interface is close to a droplet, the droplet follows an upwardly concave parabolic pathway. By using the leaky dielectric model, we have verified that this phenomenon is caused by the distorted electric field due to the difference in permittivities. Furthermore, it is enhanced by the accumulated free charges on the oil-air interface due to the difference in the electric conductivities of oil and air. Finally, we suggest a complementary arrangement of electrodes for realizing a straight pathway of the droplet near the interface.
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82.45.-h Electrochemistry and electrophoresis
47.65.-d Magnetohydrodynamics and electrohydrodynamics
41.20.Cv Electrostatics; Poisson and Laplace equations, boundary-value problems
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