Materials Literature
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Energy transfer to acoustic phonons is the dominant low-temperature cooling channel of electrons in a crystal. For cold neutral graphene we find that the weak cooling power of its acoustic modes relative to their heat capacity leads to a power-law decay of the electronic temperature when far from equilibrium. For heav…
We have prepared conductive core-sheath nanofibers via a combination of electrospinning and aqueous polymerization. Specifically, nanofibers electrospun from poly(ε-caprolactone) (PCL) and poly((L)-lactide) (PLA) were employed as templates to generate uniform sheaths of polypyrrole (PPy) via in situ polymerization. Th…
The chalcopyrite-like structure of Cu2MSnQ4 is an ordered tetrahedral array of flattened CuQ4 and undistorted MQ4 and SnQ4, with a low lattice thermal conductivity. The [Cu2Q4] tetrahedral layers are electrically conducting, and the [SnMQ4] layers are electrically insulating.
It is widely assumed that the dominant source of scattering in graphene is charged impurities in a substrate. We have tested this conjecture by studying graphene placed on various substrates and in high-kappa media. Unexpectedly, we have found no significant changes in carrier mobility either for different substrates…
Chemically prepared graphene was used to form highly active electrodes for use as a cathode in a Li battery. The first discharge process gave a flat discharge plateau at 2.20 V at a current density of 50 mA g−1, and a discharge capacity of 528 mA h g−1 was obtained with a cutoff voltage of 2.0 V.
A large body of work has been reported in the last 5 years on the development of lead‐free piezoceramics in the quest to replace lead–zirconate–titanate (PZT) as the main material for electromechanical devices such as actuators, sensors, and transducers. In specific but narrow application ranges the new materials appe…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionNucleobase-Directed Amyloid Nanotube AssemblyPeng Liu, Rong Ni, Anil K. Mehta, W. Seth Childers, Ami Lakdawala, Sai Venkatesh Pingali, Pappannan Thiyagarajan, and David G. Lynn*Cite this: J. Am. Chem. Soc. 2009, 131, 23,…
Nano-structured conducting polypyrroles were synthesized in the ionic liquids (ILs) based on 1-alkyl-3-methylimidazolium family with tetrachloroferrate as an anion (<TEX>$C_n\;mim\;[FeCl_4]\;with\;n\;=\;4,\;8,\;and\;12$</TEX>). The polypyrrole nanostructures synthesized in ILs were formed as spherical shapes. For ioni…
[<TEX>$Mn_{12}O_{12}(azo-L)_{16}(H_2O)_4$</TEX>] (1), a new Mn12 single molecule magnet containing a photochromic azobenzene ligand, has been successfully synthesized by substitution of acetate ligand of Mn12 with 6-[4-{4-hexyloxyphenyl( azo)}-phenoxy]hexanoic-1-acid. The reversible photoisomerization of the azobenzen…
Single-crystalline La 0.7 Ca 0.3 MnO 3−δ thin-films, 20 nm thick, were grown coherently on lattice well-matched (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 (0 0 1) substrates by pulsed-laser deposition, and the control, diffusion and stability of oxygen in the films were carefully investigated. Using x-ray reciprocal space map…
Hollow Sn and Pb nanoparticles have been prepared by a rapid injection of an aqueous solution of <TEX>$SnCl_2$</TEX>- poly(vinylpyrrolidone) (PVP, surfactant) and <TEX>$Pb(OAc)_2<TEX>${\cdot}$</TEX>3H_2O-PVP$</TEX> into an aqueous solution of sodium borohydride (reducing agent) in simple, one-pot reaction at room temp…
Cocoons of Theridiosoma gemmosum consist of two main parts, the egg sac case and the stalk. The inner space of the egg sac case is filled with nonsticky flocculent silk. Measuring 600-800 nm in diameter, the flocculent threads are never made up of bundles of longitudinally oriented nanofibrils. The egg case wall consi…
In the title compound [systematic name 5-de-oxy-5-fluoro-N-(pent-yloxycarbon-yl)cytidine], C(15)H(22)FN(3)O(6), the pentyl chain is disordered over two positions with refined occupancies of 0.53 (5) and 0.47 (5). The furan ring assumes an envelope conformation. In the crystal, inter-molecular N-H⋯O hydrogen bonds link…
Abstract A dynamic finite element method is used to analyze the thermoformability of composites containing wood and a thermoplastic matrix for five different proportions of wood flour. Linear viscoelastic properties can be obtained by small amplitude oscillatory shear tests and the viscoelastic behavior is characteriz…
Abstract Impact fracture strength is an important characterization for impact toughness of materials. A polypropylene (PP) filled with diatomite with different diameter (5, 7, and 13 μm) was fabricated by means a twin‐screw extruder. The impact fracture strength of these composites was measured at room temperature to…
Today the vast majority of the scanning electron microscopes (SEMs) are incapable of taking repeatable and accurate images at high magnifications. Geometric distortions are common, so are drift, vibration, and problems related to disturbing electro-magnetic fields, contamination. These issues tend to degrade the quali…
Using rigorous diffraction theory, we show that it is possible to depolarize quasi-monochromatic light using a fully deterministic, thin optical element. The principle is based on polarization-sensitive resonant gratings in total-internal-reflection configuration, and careful numerical design by the Fourier modal meth…
We describe chalcogenide glass (ChG)-based nanostructures for use as substrates for surface-enhanced Raman scattering (SERS). Such substrates were fabricated by exploiting the photosensitivity of ChG. This allows convenient control of the shape, size, and spacing of the nanostructures. The substrates were used to inve…
We have investigated the model light harvesting systems (LHSs) A and B typifying energy transfer (ET) between a naphthalene, Np (donor, D), and an azobenzene, Az (acceptor, A), shown schematically in Scheme 2 . These models were actualized as the naphthyl azo molecules 1 and 4 containing a methylene tether (Scheme 1).…
As the primary candidate of ITER Test Blanket Module (TBM) to be tested under the leadership of Japan, a water cooled solid breeder (WCSB) TBM is being developed. This paper shows the recent achievements towards the milestones of ITER TBMs prior to the installation, which consist of design integration in ITER, module…