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Recently Published Articles

  1. Wettability by Ionic Liquids

    Hongliang Liu and Lei Jiang

    Article first published online: 30 NOV 2015 | DOI: 10.1002/smll.201501526

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    The wettability of surfaces by ionic liquids is crucial for the rational design of ionic liquid-based materials. Key breakthroughs in ionic liquid wettability are reviewed here, including the electrowetting of ionic liquids in gas–liquid–solid systems and liquid–liquid–solid systems, and ionic liquids as useful probe fluids. Importantly, the superwettability of ionic liquids and the future directions of ionic liquid wettability are proposed, in the hope of generating interest in this field and encouraging scientists to engage in this area and tackle its challenges.

  2. Free-Standing Graphene Thermophone on a Polymer-Mesh Substrate

    Choong Sun Kim, Seul Ki Hong, Jung-Min Lee, Dong-Soo Kang, Byung Jin Cho and Jung-Woo Choi

    Article first published online: 30 NOV 2015 | DOI: 10.1002/smll.201501673

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    A graphene thermoacoustic loudspeaker with thin polymer mesh is fabricated using screen-printing. An experiment with substrates of various free-standing areas shows that higher sound pressure level can be achieved as compared to previously reported graphene thermoacoustic loudspeakers. Moreover, modified equation to predict the sound pressure level of the thermoacoustic loudspeaker with thin and patterned substrate is proposed and verified by experimental results.

  3. Simultaneous or Sequential Orthogonal Gradient Formation in a 3D Cell Culture Microfluidic Platform

    Sebastien G. M. Uzel, Ovid C. Amadi, Taylor M. Pearl, Richard T. Lee, Peter T. C. So and Roger D. Kamm

    Article first published online: 30 NOV 2015 | DOI: 10.1002/smll.201501905

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    Microfluidic devices are designed to allow the formation of simultaneous or sequential concentration gradients within a 3D extracellular matrix. These gradients can be used to investigate biological phenomena, such as the differentiation of progenitor cells into neurons as it occurs within the developing spinal cord or the dynamics of chemotaxis when cells are exposed to time dependent concentration profiles.

  4. Temperature-Dependent Exciton and Trap-Related Photoluminescence of CdTe Quantum Dots Embedded in a NaCl Matrix: Implication in Thermometry

    Sergii Kalytchuk, Olga Zhovtiuk, Stephen V. Kershaw, Radek Zbořil and Andrey L. Rogach

    Article first published online: 30 NOV 2015 | DOI: 10.1002/smll.201501984

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    Steady-state and time-resolved photoluminescence of differently sized CdTe quantum dots (QDs) embedded in a NaCl matrix is studied as a function of temperature. The suitability of CdTe QD-based solid-state probes for luminescence thermal imaging and sensing across a wide range of temperatures within three various detection schemes is demonstrated.

  5. Self-Powered Photoelectrochemical Biosensor Based on CdS/RGO/ZnO Nanowire Array Heterostructure

    Kun Zhao, Xiaoqin Yan, Yousong Gu, Zhuo Kang, Zhiming Bai, Shiyao Cao, Yichong Liu, Xiaohui Zhang and Yue Zhang

    Article first published online: 30 NOV 2015 | DOI: 10.1002/smll.201502042

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    A CdS/RGO/ZnO nanoheterostructure is fabricated and then applied in the photoelectrochemical biosensing of glutathione. The biosensor is a self-powered device with fast response, certain selectivity, reproducibility, and stability. The linear detection range of the device is from 0.05 mm to 1 mm and the detection limit is 10 μm.