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Ultrahigh Currents in Dielectric-Coated Carbon Nanotube Probes
Fabrication and deformation of three-dimensional hollow ceramic nanostructures
Nature Materials. doi:10.1038/nmat3738
Authors: Dongchan Jang, Lucas R. Meza, Frank Greer & Julia R. Greer
Creating lightweight, mechanically robust materials has long been an engineering pursuit. Many siliceous skeleton species—such as diatoms, sea sponges and radiolarians—have remarkably high strengths when compared with man-made materials of the same composition, yet are able to remain lightweight and porous. It has been suggested that these properties arise from the hierarchical arrangement of different structural elements at their relevant length scales. Here, we report the fabrication of hollow ceramic scaffolds that mimic the length scales and hierarchy of biological materials. The constituent solids attain tensile strengths of 1.75 GPa without failure even after multiple deformation cycles, as revealed by in situ nanomechanical experiments and finite-element analysis. We discuss the high strength and lack of failure in terms of stress concentrators at surface imperfections and of local stresses within the microstructural landscape. Our findings suggest that the hierarchical design principles offered by hard biological organisms can be applied to create damage-tolerant lightweight engineering materials.
A stable cathode for the aprotic Li–O2 battery
Nature Materials. doi:10.1038/nmat3737
Authors: Muhammed M. Ottakam Thotiyl, Stefan A. Freunberger, Zhangquan Peng, Yuhui Chen, Zheng Liu & Peter G. Bruce
Mechanics and molecular filtration performance of graphyne nanoweb membranes for selective water purification
DOI: 10.1039/C3NR03241H, Paper
Computational study of mechanically robust graphyne nanoweb membranes demonstrates their ability to purify water efficiently, even at the molecular level.
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Multifunctional CNT-Polymer Composites for Ultra-Tough Structural Supercapacitors and Desalination Devices
Pulsed electrodeposition of polyaniline (PANI) allows the fabrication of flexible, electrically conductive, nonwoven PANI-carbon nanotube (PANI-CNT) composite fabrics. They possess specific tensile strength and a modulus of toughness higher than that of aluminum matrix composites, titanium and aluminum alloys, steels, and many other structural materials. Electrochemical tests show that these nanocomposites additionally offer excellent cycle stability and ion electro-sorption and storage properties.
Assembly of thermally reduced graphene oxide nanostructures by alternating current dielectrophoresis as hydrogen-gas sensors
Lee最近都拿GO做什么。。。
Chemo-resistive hydrogen-gas sensors based on thermally reduced graphene oxide (rGO) have been fabricated on a micro-hotplate by positive ac dielectrophoresis (DEP). The optimized DEP parameters for manipulating rGO nanostructures into Au electrodes for hydrogen sensing are: applied frequency = 1 ... [Appl. Phys. Lett. 103, 083112 (2013)] published Thu Aug 22, 2013.
Proposal for all-graphene monolithic logic circuits
LeeAssembly
Since the very inception of integrated circuits, dissimilar materials have been used for fabricating devices and interconnects. Typically, semiconductors are used for devices and metals are used for interconnecting them. This, however, leads to a “contact resistance” between them that degrades dev ... [Appl. Phys. Lett. 103, 083113 (2013)] published Thu Aug 22, 2013.