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25 Aug 2008

Volume 93, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 93, 083901 (2008); http://dx.doi.org/10.1063/1.2973167 (3 pages)

R. J. Martín-Palma, C. G. Pantano, and A. Lakhtakia
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Different curvatures of tunable liquid microlens via the control of laminar flow rate

Y. C. Seow, A. Q. Liu, L. K. Chin, X. C. Li, H. J. Huang, T. H. Cheng, and X. Q. Zhou

Appl. Phys. Lett. 93, 084101 (2008); http://dx.doi.org/10.1063/1.2976210 (3 pages) | Cited 18 times

Online Publication Date: 26 August 2008

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This letter reports the tunable liquid microlens using three laminar flows injected into an expansion chamber. Different lens shapes and curvatures can be achieved and tuned through the control of three flow rates. The expansion chamber is designed to improve the fluidic stability and maintain the ideal lens shape for precise microscale optical measurement. The optical aberration is also eliminated by minimizing the diffusive broadening at the interfaces. The collimation and focusing capabilities of three liquid microlenses are demonstrated. The tunable liquid microlens is promising as a tool to realize different optical components that can be integrated onto a microchip.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.85.Np Fluidics
42.79.Ag Apertures, collimators
42.79.Bh Lenses, prisms and mirrors

Thermochemical control of oil droplet motion on a solid substrate

Chaeyeon Song, Kipom Kim, Kyuyong Lee, and Hyuk Kyu Pak

Appl. Phys. Lett. 93, 084102 (2008); http://dx.doi.org/10.1063/1.2976312 (3 pages) | Cited 3 times

Online Publication Date: 26 August 2008

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Through the thermochemical control of a liquid droplet on a solid substrate, we investigated the motion of the droplet and the underlying mechanism. Depending on the contact angle of the running droplet on the substrate with a chemical gradient coating, we observed two different behaviors for the droplet under local laser heating: reversing for a contact angle larger than a critical value ( ∼ 90°) and passing for a smaller value. The motion at the laser heating position was found to be closely related to the contact angle change, indicating that capillary flow plays an important role in the thermally induced motion of the droplet.
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47.55.dm Thermocapillary effects
47.55.dr Interactions with surfaces
47.55.pb Thermal convection
47.85.L- Flow control
47.55.nb Capillary and thermocapillary flows
68.03.Cd Surface tension and related phenomena

Stretching DNA with electric fields beneath submicron interfacial constriction created by a closely fitting microdroplet in a microchannel

Shu-Fu Hsieh, Chia-Pu Chang, Yi-Je Juang, and Hsien-Hung Wei

Appl. Phys. Lett. 93, 084103 (2008); http://dx.doi.org/10.1063/1.2969047 (3 pages) | Cited 6 times

Online Publication Date: 27 August 2008

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In this article, we report an alternative strategy for stretching single DNA molecules with electric fields. The approach invokes a closely fitting microdroplet in a microchannel, creating a natural converging geometry for stretching DNA within a submicron interfacial constriction. We demonstrate that DNA molecules can undergo prestretching within the constriction, pseudotethering entropic trap, and rapid extension within the thin film underneath the droplet. An elastic dumbbell model is derived to account for the observed stretch behavior, with predictions in good agreement with the experimental results.
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87.14.gk DNA
82.37.Rs Single molecule manipulation of proteins and other biological molecules
87.50.C- Static and low-frequency electric and magnetic fields effects
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