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4 Dec 2006

Volume 89, Issue 23, Articles (23xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 89, 233120 (2006); http://dx.doi.org/10.1063/1.2402115 (3 pages)

S. Yeo, Y. Horibe, S. Mori, C. M. Tseng, C. H. Chen, A. G. Khachaturyan, C. L. Zhang, and S.-W. Cheong
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Thermally mediated breakup of drops in microchannels

Teck Hui Ting, Yit Fatt Yap, Nam-Trung Nguyen, Teck Neng Wong, John Chee Kiong Chai, and Levent Yobas

Appl. Phys. Lett. 89, 234101 (2006); http://dx.doi.org/10.1063/1.2400200 (3 pages) | Cited 25 times

Online Publication Date: 5 December 2006

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The authors used thermally induced surface tension gradients to manipulate aqueous droplets in microchannels. Control of the droplet breakup process was demonstrated. Droplet sorting can be achieved with temperatures above a critical value. Numerical simulation using a two-dimensional model agrees qualitatively well with the experimental results. The used control temperature of less than 55 °C shows that this active control concept is suitable for biochemical applications. Thermal control promises to be a simple and effective manipulation method for droplet-based lab on a chip.
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47.55.df Breakup and coalescence
47.61.Fg Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS)
47.60.-i Flow phenomena in quasi-one-dimensional systems
47.85.Np Fluidics
47.55.pb Thermal convection
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Microfluidic cell fusion under continuous direct current voltage

Jun Wang and Chang Lu

Appl. Phys. Lett. 89, 234102 (2006); http://dx.doi.org/10.1063/1.2402122 (3 pages) | Cited 15 times

Online Publication Date: 7 December 2006

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The authors report a technique which produces cell-to-cell electrofusion using a common direct current power supply on a microfluidic platform. In the authors’ method, the cells were first conjugated based on biotin-streptavidin interaction. The electrofusion was then conducted by flowing the linked cells through a simple microfluidic channel with geometric variation under continuous direct current voltage. This microfluidics-based technique offers processing at the level of single cell pairs with efficiency comparable to that of conventional electrofusion technique based on electrical pulses.
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87.80.-y Biophysical techniques (research methods)
87.17.-d Cell processes
47.60.-i Flow phenomena in quasi-one-dimensional systems
47.85.Np Fluidics
87.14.E- Proteins
87.15.R- Reactions and kinetics

Anomalous conical menisci under an ac field-departure from the dc Taylor cone

Siddharth Maheshwari and Hsueh-Chia Chang

Appl. Phys. Lett. 89, 234103 (2006); http://dx.doi.org/10.1063/1.2402883 (3 pages) | Cited 8 times

Online Publication Date: 7 December 2006

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Observation of steady conical menisci with longitudinal growth is reported for electrospraying under high frequency alternating current (ac) electric fields. The authors report conical shapes that are analogous to the well-known direct-current (dc) cone-jet mode in the occurrence of conical menisci, but have some very distinctively ac features. The ac cones show a unique longitudinal growth that result in very high aspect ratio cones. The cone half angle for ethanol is approximately 9° for the ac case as compared to 47° for the dc case. These dissimilarities point to different mechanisms for dc and ac sprayings.
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47.65.-d Magnetohydrodynamics and electrohydrodynamics
47.57.jd Electrokinetic effects
47.20.Ma Interfacial instabilities (e.g., Rayleigh-Taylor)
47.60.-i Flow phenomena in quasi-one-dimensional systems

Investigation of capillary adhesion between the microcantilever and the substrate with electronic speckle pattern interferometry

Xide Li and Yun Peng

Appl. Phys. Lett. 89, 234104 (2006); http://dx.doi.org/10.1063/1.2403187 (3 pages) | Cited 5 times

Online Publication Date: 8 December 2006

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In this letter, the authors present an experimental study of the capillary adhesion of microcantilevers and substrate using electronic speckle pattern interferometry. The transient deformation of a microcantilever caused by the capillary force was measured and the energy function of the adhesion system was constructed based on the independent parameters of adhesion length and volume fraction of the adhesion medium. Therefore, the capillary force could be theoretically determined by the minimum energy function, and the deformation of the microcantilever at the equilibrium state could be calculated and compared with the experimental result.
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68.35.Np Adhesion
42.30.Ms Speckle and moiré patterns
07.10.Cm Micromechanical devices and systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
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