Nature Materials contents: July 2015 Volume 14 Number 7 pp 653-744

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TABLE OF CONTENTS July 2015 Volume 14, Issue 7 Editorial Research Highlights News and Views Progress Article Letters Articles Erratum Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Open for Submissions A new open access, online-only, multidisciplinary research journal dedicated to publishing the most important scientific advances in the life sciences, physical sciences, and engineering fields that are facilitated by spaceflight and analogue platforms. Explore the benefits of submitting your next research article.   Editorial Top Troubles ahead   p653 doi:10.1038/nmat4349 The outcome of the UK election leaves science challenged on at least three fronts. Research Highlights Top DNA nanostructures: Stable chainmail | Friction: Sliding scrolls | Organic transistors: Holey contacts | Semiconductor nanowires: Sn-seeded Esaki diode | Polymer substrates: Supporting pluripotency News and Views Top Heusler alloys: Tuning exchange bias   pp655 - 656 Per Nordblad doi:10.1038/nmat4331 Exchange bias is a magnetic phenomenon that has facilitated the ever-increasing storage density of magnetic recording systems. The finding of high tunable exchange bias in certain Heusler alloys indicates new routes for the design of rare-earth-free hard magnetic materials. See also: Letter by Nayak et al. Dislocation nucleation: Diffusive origins   pp656 - 657 Ju Li doi:10.1038/nmat4326 A growing body of evidence suggests that nucleation of a first dislocation in a pristine crystal is associated with a diffusion-controlled process. Understanding this is critical for strain-engineered devices at ultrahigh stresses. See also: Article by Chen et al. X-ray microscopy: Beyond ensemble averages   pp657 - 658 Gene E. Ice and John D. Budai doi:10.1038/nmat4339 Imaging the dynamics of local phenomena in materials with resolution down to the individual grain level is poised to transform our understanding of material behaviour. See also: Letter by Huang et al. Epidermal electronics: Skin health monitoring   pp659 - 660 Stéphanie P. Lacour doi:10.1038/nmat4328 Ultrathin and conformal piezoelectric transducers enable high-resolution mapping of the mechanical properties of human skin. See also: Article by Dagdeviren et al. Material witness: The complex costs of faking it   p660 Philip Ball doi:10.1038/nmat4330 DNA-peptide complexes: Regulation of interferon production   pp661 - 662 William M. Gelbart doi:10.1038/nmat4332 DNA spacing within hexagonal bundles of DNA and polycationic peptides correlates with interferon production in dendritic cells. See also: Letter by Schmidt et al. Wound healing: Enzymatically crosslinked scaffolds   pp662 - 663 David W. Grainger doi:10.1038/nmat4337 Microgel particle precursors bearing peptide substrates for human enzymes crosslink in wound sites to produce bioactive scaffolds in situ that rapidly recruit cells and promote dermal healing. See also: Article by Griffin et al. Silicon photonics: Large-scale dielectric metasurfaces   pp664 - 665 Nicolas Bonod doi:10.1038/nmat4338 Researchers develop a simple and low-cost fabrication method for the production of large-scale all-dielectric metasurfaces, which exhibit near-perfect reflectivity in the telecommunications spectral window. Nature Materials JOBS of the week Postdoctoral researcher: Simulations of the properties and morphology of polymers KU Leuven More Science jobs from Nature Materials EVENT Frontiers in Life and Materials Sciences: Creating Life in 3D 02.09.15 Czech Republic More science events from Progress Article Top Phonon wave interference and thermal bandgap materials   pp667 - 674 Martin Maldovan doi:10.1038/nmat4308 Thermal vibrations in materials can be controlled via interference (in a similar way to light propagating in layered structures) to produce a thermal bandgap, an approach promising for thermoelectric applications. Letters Top Quasiparticle-mediated spin Hall effect in a superconductor   pp675 - 678 T. Wakamura, H. Akaike, Y. Omori, Y. Niimi, S. Takahashi, A. Fujimaki, S. Maekawa and Y. Otani doi:10.1038/nmat4276 In the superconducting phase of niobium nitride the spin Hall effect is mediated by quasiparticles. Decreasing the spin injection current causes the inverse spin Hall signal to become 2,000 times larger in this phase than in the normal state. Design of compensated ferrimagnetic Heusler alloys for giant tunable exchange bias   pp679 - 684 Ajaya K. Nayak, Michael Nicklas, Stanislav Chadov, Panchanana Khuntia, Chandra Shekhar, Adel Kalache, Michael Baenitz, Yurii Skourski, Veerendra K. Guduru, Alessandro Puri, Uli Zeitler, J. M. D. Coey and Claudia Felser doi:10.1038/nmat4248 An approach to design compensated ferrimagnetic Heusler alloys is established. A small lack of compensation produces giant exchange bias and large coercivity. This effect is observed for alloys that have the magnetic transition above room temperature. See also: News and Views by Nordblad Stabilizing triplet excited states for ultralong organic phosphorescence   pp685 - 690 Zhongfu An, Chao Zheng, Ye Tao, Runfeng Chen, Huifang Shi, Ting Chen, Zhixiang Wang, Huanhuan Li, Renren Deng, Xiaogang Liu and Wei Huang doi:10.1038/nmat4259 A design rule to synthesize organic molecules with a phosphorescence lifetime longer than 1 second is presented. The molecules form H aggregates that promote the stabilization of triplet excitons and persistent luminescence under ambient conditions. Grain rotation and lattice deformation during photoinduced chemical reactions revealed by in situ X-ray nanodiffraction   pp691 - 695 Zhifeng Huang, Matthias Bartels, Rui Xu, Markus Osterhoff, Sebastian Kalbfleisch, Michael Sprung, Akihiro Suzuki, Yukio Takahashi, Thomas N. Blanton, Tim Salditt and Jianwei Miao doi:10.1038/nmat4311 An in situ X-ray nanodiffraction technique allows for the real-time study of the photoinduced chemical reaction to produce Ag from AgBr, and can spatially resolve structural changes at the submicrometre scale with a time resolution of 5 ms. See also: News and Views by Ice & Budai Liquid-crystalline ordering of antimicrobial peptide-DNA complexes controls TLR9 activation   pp696 - 700 Nathan W. Schmidt, Fan Jin, Roberto Lande, Tine Curk, Wujing Xian, Calvin Lee, Loredana Frasca, Daan Frenkel, Jure Dobnikar, Michel Gilliet and Gerard C. L. Wong doi:10.1038/nmat4298 Liquid-crystalline arrangements of complexes of DNA and antimicrobial peptides can lead to multivalent electrostatic interactions that drastically amplify TLR9-mediated immune responses. See also: News and Views by Gelbart In vivo delivery of transcription factors with multifunctional oligonucleotides   pp701 - 706 Kunwoo Lee, Mohammad Rafi, Xiaojian Wang, Kiana Aran, Xuli Feng, Carlo Lo Sterzo, Richard Tang, Nithya Lingampalli, Hyun Jin Kim and Niren Murthy doi:10.1038/nmat4269 Clinical translation of transcription factor therapeutics is limited by delivery problems. Now, an oligonucleotide that can bind and deliver transcription factors with high in vivo efficiency and treat acetaminophen-induced liver injury is reported. Articles Top Measuring surface dislocation nucleation in defect-scarce nanostructures   pp707 - 713 Lisa Y. Chen, Mo-rigen He, Jungho Shin, Gunther Richter and Daniel S. Gianola doi:10.1038/nmat4288 A detailed study is performed of dislocation nucleation at the surface of defect-free crystalline nanowhiskers, including the effect of sample size, temperature and strain rate, via in situ mechanical testing. See also: News and Views by Li Elastic coupling between layers in two-dimensional materials   pp714 - 720 Yang Gao, Suenne Kim, Si Zhou, Hsiang-Chih Chiu, Daniel Nélias, Claire Berger, Walt de Heer, Laura Polloni, Roman Sordan, Angelo Bongiorno and Elisa Riedo doi:10.1038/nmat4322 Sub-ångström-resolution indentation measurements and semi-analytical methods indicate that, for few-layer-thick films, the elasticity perpendicular to the plane is sensitive to the films' structure and the presence of intercalated molecules. The effect of mechanical twisting on oxygen ionic transport in solid-state energy conversion membranes   pp721 - 727 Yanuo Shi, Alexander Hansen Bork, Sebastian Schweiger and Jennifer Lilia Marguerite Rupp doi:10.1038/nmat4278 Manipulating strain states to modulate ionic conduction in micro energy devices has proved difficult. Effective net strain is now used to control oxygen ionic transport kinetics in ceria-based electrolyte membranes. Conformal piezoelectric systems for clinical and experimental characterization of soft tissue biomechanics   pp728 - 736 Canan Dagdeviren, Yan Shi, Pauline Joe, Roozbeh Ghaffari, Guive Balooch, Karan Usgaonkar, Onur Gur, Phat L. Tran, Jessi R. Crosby, Marcin Meyer, Yewang Su, R. Chad Webb, Andrew S. Tedesco, Marvin J. Slepian, Yonggang Huang and John A. Rogers doi:10.1038/nmat4289 Piezoelectric sensors and actuators are embedded in pliable devices that conform to human skin and organ surfaces. These devices enable rapid characterization of the mechanical properties of soft tissues under various clinical conditions. See also: News and Views by Lacour Accelerated wound healing by injectable microporous gel scaffolds assembled from annealed building blocks   pp737 - 744 Donald R. Griffin, Westbrook M. Weaver, Philip O. Scumpia, Dino Di Carlo and Tatiana Segura doi:10.1038/nmat4294 Injectable microporous scaffolds assembled from annealed microgel building blocks whose properties can be tailored by microfluidic fabrication facilitate rapid wound healing in vivo. See also: News and Views by Grainger Erratum Top Erratum: Photochemical transformations on plasmonic metal nanoparticles   p744 Suljo Linic, Umar Aslam, Calvin Boerigter and Matthew Morabito doi:10.1038/nmat4329 Top Natureevents is a fully searchable, multi-disciplinary database designed to maximise exposure for events organisers. The contents of the Natureevents Directory are now live. The digital version is available here. Find the latest scientific conferences, courses, meetings and symposia on natureevents.com. 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