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Nature Materials

Nicolas Bachelard, Chad Ropp, Marc Dubois, Rongkuo Zhao, Yuan Wang, Xiang Zhang
Material systems that reside far from thermodynamic equilibrium have the potential to exhibit dynamic properties and behaviours resembling those of living organisms. Here we realize a non-equilibrium material characterized by a bandgap whose edge is enslaved to the wavelength of an external coherent drive. The structure dynamically self-assembles into an unconventional pseudo-crystal geometry that equally distributes momentum across elements. The emergent bandgap is bestowed with lifelike properties, such as the ability to self-heal to perturbations and adapt to sudden changes in the drive...
June 19, 2017: Nature Materials
R Giridharagopal, L Q Flagg, J S Harrison, M E Ziffer, J Onorato, C K Luscombe, D S Ginger
Ionic transport phenomena in organic semiconductor materials underpin emerging technologies ranging from bioelectronics to energy storage. The performance of these systems is affected by an interplay of film morphology, ionic transport and electronic transport that is unique to organic semiconductors yet poorly understood. Using in situ electrochemical strain microscopy (ESM), we demonstrate that we can directly probe local variations in ion transport in polymer devices by measuring subnanometre volumetric expansion due to ion uptake following electrochemical oxidation of the semiconductor...
June 19, 2017: Nature Materials
Xavier Crispin, Sergei V Kalinin
No abstract text is available yet for this article.
June 19, 2017: Nature Materials
Yanliang Liang, Yan Jing, Saman Gheytani, Kuan-Yi Lee, Ping Liu, Antonio Facchetti, Yan Yao
Aqueous rechargeable batteries provide the safety, robustness, affordability, and environmental friendliness necessary for grid storage and electric vehicle operations, but their adoption is plagued by poor cycle life due to the structural and chemical instability of the anode materials. Here we report quinones as stable anode materials by exploiting their structurally stable ion-coordination charge storage mechanism and chemical inertness towards aqueous electrolytes. Upon rational selection/design of quinone structures, we demonstrate three systems that coupled with industrially established cathodes and electrolytes exhibit long cycle life (up to 3,000 cycles/3,500 h), fast kinetics (≥20C), high anode specific capacity (up to 200-395 mAh g(-1)), and several examples of state-of-the-art specific energy/energy density (up to 76-92 Wh kg(-1)/ 161-208 Wh l(-1)) for several operational pH values (-1 to 15), charge carrier species (H(+), Li(+), Na(+), K(+), Mg(2+)), temperature (-35 to 25 °C), and atmosphere (with/without O2), making them a universal anode approach for any aqueous battery technology...
June 19, 2017: Nature Materials
Jennifer K Lee, Le W Huwe, Nikolaos Paschos, Ashkan Aryaei, Courtney A Gegg, Jerry C Hu, Kyriacos A Athanasiou
Scaffold-free systems have emerged as viable approaches for engineering load-bearing tissues. However, the tensile properties of engineered tissues have remained far below the values for native tissue. Here, by using self-assembled articular cartilage as a model to examine the effects of intermittent and continuous tension stimulation on tissue formation, we show that the application of tension alone, or in combination with matrix remodelling and synthesis agents, leads to neocartilage with tensile properties approaching those of native tissue...
June 12, 2017: Nature Materials
X Lin, J C Lu, Y Shao, Y Y Zhang, X Wu, J B Pan, L Gao, S Y Zhu, K Qian, Y F Zhang, D L Bao, L F Li, Y Q Wang, Z L Liu, J T Sun, T Lei, C Liu, J O Wang, K Ibrahim, D N Leonard, W Zhou, H M Guo, Y L Wang, S X Du, S T Pantelides, H-J Gao
Two-dimensional (2D) materials have been studied extensively as monolayers, vertical or lateral heterostructures. To achieve functionalization, monolayers are often patterned using soft lithography and selectively decorated with molecules. Here we demonstrate the growth of a family of 2D materials that are intrinsically patterned. We demonstrate that a monolayer of PtSe2 can be grown on a Pt substrate in the form of a triangular pattern of alternating 1T and 1H phases. Moreover, we show that, in a monolayer of CuSe grown on a Cu substrate, strain relaxation leads to periodic patterns of triangular nanopores with uniform size...
June 12, 2017: Nature Materials
Francisco R Fortea-Pérez, Marta Mon, Jesús Ferrando-Soria, Mercedes Boronat, Antonio Leyva-Pérez, Avelino Corma, Juan Manuel Herrera, Dmitrii Osadchii, Jorge Gascon, Donatella Armentano, Emilio Pardo
The development of catalysts able to assist industrially important chemical processes is a topic of high importance. In view of the catalytic capabilities of small metal clusters, research efforts are being focused on the synthesis of novel catalysts bearing such active sites. Here we report a heterogeneous catalyst consisting of Pd4 clusters with mixed-valence 0/+1 oxidation states, stabilized and homogeneously organized within the walls of a metal-organic framework (MOF). The resulting solid catalyst outperforms state-of-the-art metal catalysts in carbene-mediated reactions of diazoacetates, with high yields (>90%) and turnover numbers (up to 100,000)...
June 12, 2017: Nature Materials
Dong Yang, Bruce C Gates
No abstract text is available yet for this article.
June 12, 2017: Nature Materials
Laura Rodríguez-Arco, Mei Li, Stephen Mann
The spontaneous assembly of micro-compartmentalized colloidal objects capable of controlled interactions offers a step towards rudimentary forms of collective behaviour in communities of artificial cell-like entities (synthetic protocells). Here we report a primitive form of artificial phagocytosis in a binary community of synthetic protocells in which multiple silica colloidosomes are selectively ingested by self-propelled magnetic Pickering emulsion (MPE) droplets comprising particle-free fatty acid-stabilized apertures...
June 12, 2017: Nature Materials
Joseph W Lyding
No abstract text is available yet for this article.
June 12, 2017: Nature Materials
Kwang Jin Lee, Yiming Xiao, Jae Heun Woo, Eunsun Kim, David Kreher, André-Jean Attias, Fabrice Mathevet, Jean-Charles Ribierre, Jeong Weon Wu, Pascal André
Charge transfer (CT) is a fundamental and ubiquitous mechanism in biology, physics and chemistry. Here, we evidence that CT dynamics can be altered by multi-layered hyperbolic metamaterial (HMM) substrates. Taking triphenylene:perylene diimide dyad supramolecular self-assemblies as a model system, we reveal longer-lived CT states in the presence of HMM structures, with both charge separation and recombination characteristic times increased by factors of 2.4 and 1.7-that is, relative variations of 140 and 73%, respectively...
June 5, 2017: Nature Materials
J Krebs, S I Rao, S Verheyden, C Miko, R Goodall, W A Curtin, A Mortensen
Metals are known to exhibit mechanical behaviour at the nanoscale different to bulk samples. This transition typically initiates at the micrometre scale, yet existing techniques to produce micrometre-sized samples often introduce artefacts that can influence deformation mechanisms. Here, we demonstrate the casting of micrometre-scale aluminium single-crystal wires by infiltration of a salt mould. Samples have millimetre lengths, smooth surfaces, a range of crystallographic orientations, and a diameter D as small as 6 μm...
May 29, 2017: Nature Materials
Mahsa Siavashpouri, Christian H Wachauf, Mark J Zakhary, Florian Praetorius, Hendrik Dietz, Zvonimir Dogic
Establishing precise control over the shape and the interactions of the microscopic building blocks is essential for design of macroscopic soft materials with novel structural, optical and mechanical properties. Here, we demonstrate robust assembly of DNA origami filaments into cholesteric liquid crystals, one-dimensional supramolecular twisted ribbons and two-dimensional colloidal membranes. The exquisite control afforded by the DNA origami technology establishes a quantitative relationship between the microscopic filament structure and the macroscopic cholesteric pitch...
May 22, 2017: Nature Materials
T Ideue, T Kurumaji, S Ishiwata, Y Tokura
Multiferroics, in which dielectric and magnetic orders coexist and couple with each other, attract renewed interest for their cross-correlated phenomena, offering a fundamental platform for novel functionalities. Elementary excitations in such systems are strongly affected by the lattice-spin interaction, as exemplified by the electromagnons and the magneto-thermal transport. Here we report an unprecedented coupling between magnetism and phonons in multiferroics, namely, the giant thermal Hall effect. The thermal transport of insulating polar magnets (ZnxFe1-x)2Mo3O8 is dominated by phonons, yet extremely sensitive to the magnetic structure...
May 15, 2017: Nature Materials
Naoji Matsuhisa, Daishi Inoue, Peter Zalar, Hanbit Jin, Yorishige Matsuba, Akira Itoh, Tomoyuki Yokota, Daisuke Hashizume, Takao Someya
Printable elastic conductors promise large-area stretchable sensor/actuator networks for healthcare, wearables and robotics. Elastomers with metal nanoparticles are one of the best approaches to achieve high performance, but large-area utilization is limited by difficulties in their processability. Here we report a printable elastic conductor containing Ag nanoparticles that are formed in situ, solely by mixing micrometre-sized Ag flakes, fluorine rubbers, and surfactant. Our printable elastic composites exhibit conductivity higher than 4,000 S cm(-1) (highest value: 6,168 S cm(-1)) at 0% strain, and 935 S cm(-1) when stretched up to 400%...
May 15, 2017: Nature Materials
Jessica G Swallow, Jae Jin Kim, John M Maloney, Di Chen, James F Smith, Sean R Bishop, Harry L Tuller, Krystyn J Van Vliet
Actuator operation in increasingly extreme and remote conditions requires materials that reliably sense and actuate at elevated temperatures, and over a range of gas environments. Design of such materials will rely on high-temperature, high-resolution approaches for characterizing material actuation in situ. Here, we demonstrate a novel type of high-temperature, low-voltage electromechanical oxide actuator based on the model material PrxCe1-xO2-δ (PCO). Chemical strain and interfacial stress resulted from electrochemically pumping oxygen into or out of PCO films, leading to measurable film volume changes due to chemical expansion...
May 8, 2017: Nature Materials
J-Y Chauleau, E Haltz, C Carrétéro, S Fusil, M Viret
Among the variety of magnetic textures available in nature, antiferromagnetism is one of the most 'discrete' because of the exact cancellation of its staggered internal magnetization. It is therefore very challenging to probe. However, its insensitivity to external magnetic perturbations, together with the intrinsic sub-picosecond dynamics, make it very appealing for tomorrow's information technologies. Thus, it is essential to understand the microscopic mechanisms governing antiferromagnetic domains to achieve accurate manipulation and control...
May 8, 2017: Nature Materials
Yanhang Ma, Peter Oleynikov, Osamu Terasaki
Chiral crystals can be exploited for applications in enantioselective separation and catalysis. However, the study of chirality at the atomic level in a sub-micrometre-sized crystal is difficult due to the lack of adequate characterization methods. Herein, we present two efficient and practical methods of characterization that are based on electron crystallography. These methods are successfully applied to reveal the handedness of a chiral, zeolite nanocrystal. The handedness is identified through either a comparison of two high-resolution transmission electron microscope images, taken from the same nanocrystal but along different zone axes by tilting it around its screw axis, or the intensity asymmetry of a Bijvoet pair of reflections in a single precession electron-diffraction pattern...
May 1, 2017: Nature Materials
Mayur Saxena, Shuaimin Liu, Bo Yang, Cynthia Hajal, Rishita Changede, Junqiang Hu, Haguy Wolfenson, James Hone, Michael P Sheetz
Epidermal growth factor receptor (EGFR) interacts with integrins during cell spreading and motility, but little is known about the role of EGFR in these mechanosensing processes. Here we show, using two different cell lines, that in serum- and EGF-free conditions, EGFR or HER2 activity increase spreading and rigidity-sensing contractions on rigid, but not soft, substrates. Contractions peak after 15-20 min, but diminish by tenfold after 4 h. Addition of EGF at that point increases spreading and contractions, but this can be blocked by myosin-II inhibition...
May 1, 2017: Nature Materials
Hossein Fashandi, Martin Dahlqvist, Jun Lu, Justinas Palisaitis, Sergei I Simak, Igor A Abrikosov, Johanna Rosen, Lars Hultman, Mike Andersson, Anita Lloyd Spetz, Per Eklund
The large class of layered ceramics encompasses both van der Waals (vdW) and non-vdW solids. While intercalation of noble metals in vdW solids is known, formation of compounds by incorporation of noble-metal layers in non-vdW layered solids is largely unexplored. Here, we show formation of Ti3AuC2 and Ti3Au2C2 phases with up to 31% lattice swelling by a substitutional solid-state reaction of Au into Ti3SiC2 single-crystal thin films with simultaneous out-diffusion of Si. Ti3IrC2 is subsequently produced by a substitution reaction of Ir for Au in Ti3Au2C2...
May 1, 2017: Nature Materials
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