The front cover shows droplets of a molecular material for enhanced magnetic refrigeration, i.e., gadolinium acetate tetrahydrate, deposited on a cold silicon substrate. Using quantitative magnetic force microscopy at liquid‐helium temperatures, Marco Evangelisti and co‐workers demonstrate on page 2984 that the molecules hold intact their magnetic identity after the deposition. This result paves the way towards onchip cryogenic micro‐refrigerators. Artwork by O. Roubeau, G. Lorusso, and M. Evangelisti.

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Tumor Cell Isolation: High‐Purity Prostate Circulating Tumor Cell Isolation by a Polymer Nanofiber‐Embedded Microchip for Whole Exome Sequencing (Adv. Mater. 21/2013)

Zhao, Libo; Lu, Yi‐Tsung; Li, Fuqiang; Wu, Kui; Hou, Shuang; Yu, Juehua; Shen, Qinglin; Wu, Dongxia; Song, Min; OuYang, Wei‐Han; Luo, Zheng; Lee, Tom; Fang, Xiaohong; Shao, Chen; Xu, Xun; Garcia, Mitch A.;

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Contents: (Adv. Mater. 21/2013)

2013 Advanced Materials

doi: 10.1002/adma.201370139pmid: N/A

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Exciton Dynamics in Semiconductor Nanocrystals

Wheeler, Damon A.; Zhang, Jin Z.

2013 Advanced Materials

doi: 10.1002/adma.201300362pmid: 23625792

This review article provides an overview of recent advances in the study and understanding of dynamics of excitons in semiconductor nanocrystals (NCs) or quantum dots (QDs). Emphasis is placed on the relationship between exciton dynamics and optical properties, both linear and nonlinear. We also focus on the unique aspects of exciton dynamics in semiconductor NCs as compared to those in bulk crystals. Various experimental techniques for probing exciton dynamics, particularly time‐resolved laser methods, are reviewed. Relevant models and computational studies are also briefly presented. By comparing different materials systems, a unifying picture is proposed to account for the major dynamic features of excitons in semiconductor QDs. While the specific dynamic processes involved are material‐dependent, key processes can be identified for all the materials that include electronic dephasing, intraband relaxation, trapping, and interband recombination of free and trapped charge carriers (electron and hole). Exciton dynamics play a critical role in the fundamental properties and functionalities of nanomaterials of interest for a variety of applications including optical detectors, solar energy conversion, lasers, and sensors. A better understanding of exciton dynamics in nanomaterials is thus important both fundamentally and technologically.

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High‐Purity Prostate Circulating Tumor Cell Isolation by a Polymer Nanofiber‐Embedded Microchip for Whole Exome Sequencing

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Full‐Range Magnetic Manipulation of Droplets via Surface Energy Traps Enables Complex Bioassays

Zhang, Yi; Wang, Tza‐Huei

2013 Advanced Materials

doi: 10.1002/adma.201300383pmid: 23529938

Manipulating droplets on an open surface promises an easier, more flexible, and more scalable platform of liquid control, than does microchannel‐based fluidics. In this report, a surface‐energy‐trap‐enabled magnetic droplet handling platform is introduced that is capable of comprehensive droplet manipulations, including droplet dispensing, transport, fusion, and particle extraction.

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3D Graphene Foams Cross‐linked with Pre‐encapsulated Fe 3 O 4 Nanospheres for Enhanced Lithium Storage

Wei, Wei; Yang, Shubin; Zhou, Haixin; Lieberwirth, Ingo; Feng, Xinliang; Müllen, Klaus

2013 Advanced Materials

doi: 10.1002/adma.201300445pmid: 23606504

Electrostatic assembly between Fe3O4 nanospheres and graphene oxide, and subsequent hydrothermal assembly with additional graphene sheets, leads to Fe3O4 nanospheres encapsulated in the graphene shells and interconnected by the graphene networks. Such 3D Fe3O4/graphene foams exhibit enhanced lithium storage with excellent cycling performance and rate capability.

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Smart Transportation Between Three Phases Through a Stimulus‐Responsive Functionally Cooperating Device

Ju, Guannan; Cheng, Mengjiao; Xiao, Meng; Xu, Jianmei; Pan, Kai; Wang, Xing; Zhang, Yajun; Shi, Feng

2013 Advanced Materials

doi: 10.1002/adma.201205240pmid: 23636884

A “smart”, functionally cooperating device consisting of a platinum strip and steel bead inside a nickel foam cube with a temperature‐responsive polymer coating shows a diving–surfacing cycle when the water temperature first falls below and then rises above the lower critical solution temperature (LCST) of the polymer, which marks the change from superhydrophobicity to superhydrophilicity. Furthermore, the smart device allows a cycled directional delivery of lipophilic molecules between three phases.

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High‐Power Density Piezoelectric Energy Harvesting Using Radially Strained Ultrathin Trigonal Tellurium Nanowire Assembly

Lee, Tae Il; Lee, Sangmin; Lee, Eungkyu; Sohn, Sungwoo; Lee, Yean; Lee, Sujeong; Moon, Geondae; Kim, Dohyang; Kim, Youn Sang; Myoung, Jae Min; Wang, Zhong Lin

2013 Advanced Materials

doi: 10.1002/adma.201300657pmid: 23616287

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Journal of Turbomachinery Applied Mechanics Reviews Journal of Fluids and Structures Journal of Fluids Engineering, Transactions of the ASME Archive of Applied Mechanics Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit Journal of Terramechanics Advances in Mechanical Engineering Frontiers of Mechanical Engineering

2013 Advanced Materials

doi: 10.1002/adma.201370136pmid: N/A

A nanofiber‐embedded NanoVelcro Chip is coupled with ArcturusXT laser capture microdissection technology to enable the detection and isolation of single circulating tumor cells from patients with prostate cancer. Edwin M. Posadas and co‐workers demonstrate on page 2897 the capacity of conducting whole exome sequencing on single circulating tumor cells.

Rettig, Matthew;

Tseng, Hsian‐Rong;

Posadas, Edwin M.

2013 Advanced Materials

doi: 10.1002/adma.201205237pmid: 23529932

Handpick single cancer cells: A modified NanoVelcro Chip is coupled with ArcturusXT laser capture microdissection (LCM) technology to enable the detection and isolation of single circulating tumor cells (CTCs) from patients with prostate cancer (PC). This new approach paves the way for conducting next‐generation sequencing (NGS) on single CTCs.

A high‐yield solution‐processed ultrathin (<10 nm) trigonal tellurium (t‐Te) nanowire (NW) is introduced as a new class of piezoelectric nanomaterial with a six‐fold higher piezoelectric constant compared to conventional ZnO NWs for a high‐volume power‐density nanogenerator (NG). While determining the energy‐harvesting principle in a NG consisting of t‐Te NW, it is theoretically and experimentally found that t‐Te NW is piezoelectrically activated only by creating strain in its radial direction, along which it has an asymmetric crystal structure. Based upon this mechanism, a NG with a monolayer consisting of well‐aligned t‐Te NWs and a power density of 9 mW/cm3 is fabricated.