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Advanced Materials

Kuo-Feng Huang, Ding-Shuo Wang, Ming-Han Tsai, Hsiu-Hau Lin, Chih-Huang Lai
By engineering multidomain formation in Co/Pt multilayers, it is demonstrate how multilevel storage can be achieved by spin-orbit torque switching. It is rather remarkable that, by modulating the writing pulse conditions, the final magnetization states can be controlled, independent of the initial configurations. The initialization-free multilevel memory advances the spin-orbit-torque magnetic random access memory to higher storage density for practical applications.
January 18, 2017: Advanced Materials
Pengfa Xu, Wei Han, Philip M Rice, Jaewoo Jeong, Mahesh G Samant, Katayoon Mohseni, Holger L Meyerheim, Sergey Ostanin, Igor V Maznichenko, Ingrid Mertig, Eberhard K U Gross, Arthur Ernst, Stuart S P Parkin
A conducting 2D electron gas (2DEG) is formed at the interface between epitaxial LaFeO3 layers >3 unit cells thick and the surface of SrTiO3 single crystals. The 2DEG is exquisitely sensitive to cation intermixing and oxygen nonstoichiometry. It is shown that the latter thus allows the controllable formation of the 2DEG via ionic liquid gating, thereby forming a nonvolatile switch.
January 16, 2017: Advanced Materials
Wenhui Wan, Yugui Yao, Liangfeng Sun, Cheng-Cheng Liu, Fan Zhang
A PbS monolayer is demonstrated to be a novel platform for topological, valleytronic, and optical phenomena. Compressive strain can turn the trivial monolayer into topological insulators. Optical pumping can facilitate charge, spin, and valley Hall effects tunable by external strain and light ellipticity. Similar results apply to other IV-VI semiconductors.
January 16, 2017: Advanced Materials
Ji Liu, Cindy Soo Yun Tan, Ziyi Yu, Yang Lan, Chris Abell, Oren A Scherman
Biomimetic supramolecular dual networks: By mimicking the structure/function model of titin, integration of dynamic cucurbit[8]uril mediated host-guest interactions with a trace amount of covalent cross-linking leads to hierarchical dual networks with intriguing toughness, strength, elasticity, and energy dissipation properties. Dynamic host-guest interactions can be dissociated as sacrificial bonds and their facile reformation results in self-recovery of the dual network structure as well as its mechanical properties...
January 16, 2017: Advanced Materials
Le Yu, Han Hu, Hao Bin Wu, Xiong Wen David Lou
Hollow nanostructures offer promising potential for advanced energy storage and conversion applications. In the past decade, considerable research efforts have been devoted to the design and synthesis of hollow nanostructures with high complexity by manipulating their geometric morphology, chemical composition, and building block and interior architecture to boost their electrochemical performance, fulfilling the increasing global demand for renewable and sustainable energy sources. In this Review, we present a comprehensive overview of the synthesis and energy-related applications of complex hollow nanostructures...
January 16, 2017: Advanced Materials
Jonas G Croissant, Yevhen Fatieiev, Niveen M Khashab
The biorelated degradability and clearance of siliceous nanomaterials have been questioned worldwide, since they are crucial prerequisites for the successful translation in clinics. Typically, the degradability and biocompatibility of mesoporous silica nanoparticles (MSNs) have been an ongoing discussion in research circles. The reason for such a concern is that approved pharmaceutical products must not accumulate in the human body, to prevent severe and unpredictable side-effects. Here, the biorelated degradability and clearance of silicon and silica nanoparticles (NPs) are comprehensively summarized...
January 13, 2017: Advanced Materials
Biao Xu, Matthias T Agne, Tianli Feng, Thomas C Chasapis, Xiulin Ruan, Yilong Zhou, Haimei Zheng, Je-Hyeong Bahk, Mercouri G Kanatzidis, Gerald Jeffrey Snyder, Yue Wu
A scalable, low-temperature solution process is used to synthesize precursor material for Pb-doped Bi0.7 Sb1.3 Te3 thermoelectric nanocomposites. The controllable Pb-doping leads to the increase in the optical bandgap, thus delaying the onset of bipolar conduction. Furthermore, the solution synthesis enables nanostructuring, which greatly reduces thermal conductivity. As a result, this material exhibits a zT = 1 over the 513-613 K range.
January 13, 2017: Advanced Materials
Haizheng Tao, Thomas D Bennett, Yuanzheng Yue
While glasses formed by quenching the molten states of inorganic non-metallic, organic, and metallic species are known, those containing both inorganic and organic moieties are far less prevalent. Network materials consisting of inorganic nodes linked by organic ligands do however exist in the crystalline or amorphous domain. This large family of open framework compounds, called metal-organic frameworks (MOFs) or coordination polymers, has been investigated intensively in the past two decades for a variety of applications, almost all of which stem from their high internal surface areas and chemical versatility...
January 13, 2017: Advanced Materials
Eva Blasco, Martin Wegener, Christopher Barner-Kowollik
Polymeric networks have been intensely investigated and a large number of applications have been found in areas ranging from biomedicine to materials science. Network fabrication via light-induced reactions is a particularly powerful tool, since light provides ready access to temporal and spatial control, opening an array of synthetic access routes for structuring the network geometry as well as functionality. Herein, the most recent light-induced modular reactions and their use in the formation of precision polymeric networks are collated...
January 11, 2017: Advanced Materials
Chao Li, Bin Gao, Yuan Yao, Xiangxiang Guan, Xi Shen, Yanguo Wang, Peng Huang, Lifeng Liu, Xiaoyan Liu, Junjie Li, Changzhi Gu, Jinfeng Kang, Richeng Yu
Resistive switching processes in HfO2 are studied by electron holography and in situ energy-filtered imaging. The results show that oxygen vacancies are gradually generated in the oxide layer under ramped electrical bias, and finally form several conductive channels connecting the two electrodes. It also shows that the switching process occurs at the top interface of the hafnia layer.
January 11, 2017: Advanced Materials
Kevin Tian, Jinhye Bae, Shannon E Bakarich, Canhui Yang, Reece D Gately, Geoffrey M Spinks, Marc In Het Panhuis, Zhigang Suo, Joost J Vlassak
A hydrogel-dielectric elastomer system, polyacrylamide and poly(dimethylsiloxane) (PDMS), is adapted for extrusion printing for integrated device fabrication. A lithium-chloride-containing hydrogel printing ink is developed and printed onto treated PDMS with no visible signs of delamination and geometrically scaling resistance under moderate uniaxial tension and fatigue. A variety of designs are demonstrated, including a resistive strain gauge and an ionic cable.
January 11, 2017: Advanced Materials
Zongnan Deng, Hao Jiang, Yanjie Hu, Yu Liu, Ling Zhang, Honglai Liu, Chunzhong Li
A flexible and robust electrode is demonstrated by assembling the 3D ordered macroporous MoS2 @C nanostructure on carbon cloth with ultrasmall few-layered MoS2 nanosheets homogenously embedded into the interconnected carbon wall. Such unique nanostructures are favorable for enhancing lithium storage capacity, directly applied as flexible electrode, demonstrating a very high electrochemical performance and superior cycling stability for lithium ion batteries.
January 9, 2017: Advanced Materials
Mani Diba, Huanan Wang, Thomas E Kodger, Shima Parsa, Sander C G Leeuwenburgh
Composite colloidal gels are formed by the pH-induced electrostatic assembly of silica and gelatin nanoparticles. These injectable and moldable colloidal gels are able to withstand substantial compressive and tensile loads, and exhibit a remarkable self-healing efficiency. This study provides new, critical insight into the structural and mechanical properties of composite colloidal gels and opens up new avenues for practical application of colloidal gels.
January 9, 2017: Advanced Materials
Haribabu Palneedi, Deepam Maurya, Gi-Yeop Kim, Venkateswarlu Annapureddy, Myoung-Sub Noh, Chong-Yun Kang, Jong-Woo Kim, Jong-Jin Choi, Si-Young Choi, Sung-Yoon Chung, Suk-Joong L Kang, Shashank Priya, Jungho Ryu
A record-high, near-theoretical intrinsic magnetoelectric (ME) coupling of 7 V cm(-1) Oe(-1) is achieved in a heterostructure of piezoelectric Pb(Zr,Ti)O3 (PZT) film deposited on magnetostrictive Metglas (FeBSi). The anchor-like, nanostructured interface between PZT and Metglas, improved crystallinity of PZT by laser annealing, and optimum volume of crystalline PZT are found to be the key factors in realizing such a giant strain-mediated ME coupling.
January 9, 2017: Advanced Materials
Peiyi Song, Shuangyang Kuang, Nishtha Panwar, Guang Yang, Danny Jian Hang Tng, Swee Chuan Tjin, Wun Jern Ng, Maszenan Bin Abdul Majid, Guang Zhu, Ken-Tye Yong, Zhong Lin Wang
The first triboelectric-nanogenerator (TENG)-based self-powered implantable drug-delivery system is presented. Pumping flow rates from 5.3 to 40 µL min(-1) under different rotating speeds of the TENG are realized. The implantable drug-delivery system can be powered with a TENG device rotated by human hand motion. Ex vivo trans-sclera drug delivery in porcine eyes is demonstrated by utilizing the biokinetic energies of human hands.
January 9, 2017: Advanced Materials
Cheng Tang, Qiang Zhang
The oxygen reduction reaction (ORR) is the cornerstone of various sustainable energy-conversion technologies. Metal-free nanocarbon electrocatalysts with competitive activity, enhanced durability, and satisfactory cost, have been proposed as the most promising substitute for precious-metal catalysts. However, their further development is still primarily based on trial-and-error approaches due to the controversial knowledge of critical active sites and mechanisms. Herein, the activity origins of nanocarbon-based ORR electro-catalysts are comprehensively reviewed and correlated, considering the dopants, edges, and defects...
January 9, 2017: Advanced Materials
Yanyan Zhi, Xiao-Chong Yu, Qihuang Gong, Lan Yang, Yun-Feng Xiao
Detection of nanoscale objects is highly desirable in various fields such as early-stage disease diagnosis, environmental monitoring and homeland security. Optical microcavity sensors are renowned for ultrahigh sensitivities due to strongly enhanced light-matter interaction. This review focuses on single nanoparticle detection using optical whispering gallery microcavities and photonic crystal microcavities, both of which have been developing rapidly over the past few years. The reactive and dissipative sensing methods, characterized by light-analyte interactions, are explained explicitly...
January 6, 2017: Advanced Materials
Junfeng Xie, Xiaodong Zhang, Hao Zhang, Jiajia Zhang, Shuang Li, Ruoxing Wang, Bicai Pan, Yi Xie
An etching-intralayered Ostwald ripening process is proposed, which leads to the formation of a β-Ni(OH)2 ultrathin nanomesh with abundant and uniformly distributed nanopores of 3-4 nm. The nanomesh catalyst exhibits outstanding oxygen evolution reaction performance, with high catalytic current density and superior long-term stability, making this Earth-abundant nanomesh catalyst a promising candidate for commercial water splitting.
January 6, 2017: Advanced Materials
Mark A Gonzalez, Joseph R Simon, Ali Ghoorchian, Zachary Scholl, Shaoting Lin, Michael Rubinstein, Piotr Marszalek, Ashutosh Chilkoti, Gabriel P López, Xuanhe Zhao
Strong, tough, stretchable, and self-adhesive hydrogels have been designed with intrinsically unstructured proteins. The extraordinary mechanical properties exhibited by these materials are enabled by an integration of toughening mechanisms that maintain high elasticity and dissipate mechanical energy within the protein networks.
January 6, 2017: Advanced Materials
Xiandi Wang, Miaoling Que, Mengxiao Chen, Xun Han, Xiaoyi Li, Caofeng Pan, Zhong Lin Wang
Pressure sensor matrix (PSM) with full dynamic range can accurately detect and spatially map pressure profile. A 100 × 100 large-scale PSM gives both electrical and optical signals by itself without applying an external power. The device represents a major step toward digital imaging and visible display of pressure distribution covers a large dynamic range.
January 6, 2017: Advanced Materials
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