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23 Nov 2009

Volume 95, Issue 21, Articles (21xxxx)

Issue Cover Spotlight Figure

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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Quantification of biomolecule agglutination by magnetorelaxometry

D. Eberbeck, F. Wiekhorst, U. Steinhoff, and L. Trahms

Appl. Phys. Lett. 95, 213701 (2009); http://dx.doi.org/10.1063/1.3267054 (3 pages) | Cited 3 times

Online Publication Date: 25 November 2009

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The agglutination of probes, i.e., biomolecules labeled by magnetic nanoparticles, due to their binding to complement analyte molecules (e.g., biomolecules) was quantified by magnetorelaxometry in terms of the mean and the width of the size distribution of the formed aggregates. We observed a clear maximum of the agglutination at a specific analyte-to-probe concentration ratio. By means of controlled variation of this ratio, the concentration of an analyte in solution can be measured in turbid media by two step preparation using magnetic measurement techniques without the need of a solid phase for immobilization of analyte or probe.
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87.80.-y Biophysical techniques (research methods)
87.15.nr Aggregation
87.50.cf Biophysical mechanisms of interaction
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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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Erratum: “Ultraviolet and solar-blind spectral imaging with subwavelength transmission gratings” [ Appl. Phys. Lett. 95, 161107 (2009) ]

S. H. Lim and E. T. Yu

Appl. Phys. Lett. 95, 219901 (2009); http://dx.doi.org/10.1063/1.3267146 (1 page)

Online Publication Date: 24 November 2009

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Abstract Unavailable
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99.10.Cd Errata
85.60.Gz Photodetectors (including infrared and CCD detectors)
42.79.Ci Filters, zone plates, and polarizers
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Erratum: “Enhancing the photocurrent in poly(3-hexylthiophene)/ [6,6]-phenyl C61 butyric acid methyl ester bulk heterojunction solar cells by using poly(3-hexylthiophene) as a buffer layer” [ Appl. Phys. Lett. 95, 133303 (2009) ]

Chin-Wei Liang, Wei-Fang Su, and Leeyih Wang

Appl. Phys. Lett. 95, 219902 (2009); http://dx.doi.org/10.1063/1.3267145 (1 page)

Online Publication Date: 25 November 2009

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Abstract Unavailable
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99.10.Cd Errata
79.60.Bm Clean metal, semiconductor, and insulator surfaces
78.55.Kz Solid organic materials
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
84.60.Jt Photoelectric conversion
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
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