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23 Nov 2009

Volume 95, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 95, 213501 (2009); http://dx.doi.org/10.1063/1.3265958 (3 pages)

S. Cibella, M. Ortolani, R. Leoni, G. Torrioli, L. Mahler, Ji-Hua Xu, A. Tredicucci, H. E. Beere, and D. A. Ritchie
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Electrically interconnected assemblies of microscale device components by printing and molding

Mo Joon Kim, Jongseung Yoon, Sang-Il Park, and John A. Rogers

Appl. Phys. Lett. 95, 214101 (2009); http://dx.doi.org/10.1063/1.3268464 (3 pages) | Cited 3 times

Online Publication Date: 24 November 2009

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This letter presents approaches for assembly and electrical interconnection of micro/nanoscale devices into functional systems with useful characteristics. Transfer printing techniques provide deterministic control over an assembly process that occurs prior to or simultaneously with a soft lithographic molding step that defines relief features in a receiving polymer. Filling these features with conducting materials that are processable in the form of liquids or pastes yields integrated interconnects and contacts aligned to the devices. Studies of the underlying aspects and application to representative systems in photovoltaics and solid state lighting indicators provide insights into the process and its practical use.
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85.40.Ls Metallization, contacts, interconnects; device isolation
85.40.Hp Lithography, masks and pattern transfer
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Microfluidics for reconfigurable electromagnetic metamaterials

T. Serkan Kasirga, Y. Nuri Ertas, and Mehmet Bayindir

Appl. Phys. Lett. 95, 214102 (2009); http://dx.doi.org/10.1063/1.3268448 (3 pages) | Cited 2 times

Online Publication Date: 25 November 2009

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We propose microfluidics as a useful platform for reconfigurable electromagnetic metamaterials. Microfluidic split-ring resonators (MF-SRRs) are fabricated inside a flexible elastomeric material by employing rapid prototyping. The transmission measurements performed for mercury-injected MF-SRR exhibits sharp magnetic resonances at microwave wavelengths. We further calculate transmission properties of the MF-SRR array and the effect of electrical conductivity of the liquid inside the channel on the magnetic resonance. The measured results agree well with numerical calculations. Our proposal may open up directions toward switchable metamaterials and reconfigurable devices such as filters, switches, and resonators.
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47.85.Np Fluidics
42.70.Nq Other nonlinear optical materials; photorefractive and semiconductor materials
61.41.+e Polymers, elastomers, and plastics

A debubbler for microfluidics utilizing air-liquid interfaces

Daming Cheng and Hongrui Jiang

Appl. Phys. Lett. 95, 214103 (2009); http://dx.doi.org/10.1063/1.3263944 (3 pages) | Cited 2 times

Online Publication Date: 25 November 2009

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We present a debubbler for the removal of air bubbles in aqueous liquids in microfluidics. The debubbler is realized through an array of cylinder-shaped air-liquid interfaces, or air-pillars, formed directly into the microfluidic channels by surface tension. The debubbler demonstrated effective trapping and removal of both chemically generated bubbles (several nanoliters to several microliters in volume) and air slugs with several microliters in volume, which were formed by high infusion rates of bubble series introduced into the microchannel.
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47.61.Jd Multiphase flows
47.55.D- Drops and bubbles
47.60.Dx Flows in ducts and channels
68.03.Cd Surface tension and related phenomena
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