Materials Literature
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Spin-dependent coherent quantum transport through carbon nanotubes (CNT) is studied theoretically within a tight-binding model and the Green's function partitioning technique. End-contacted metal/nanotube/metal systems are modelled and next studied in the magnetic context, i.e. either with ferromagnetic electrodes or…
The relaxor ferroelectric $({\mathrm{PbMn}}_{1∕3}{\mathrm{Nb}}_{2∕3}{\mathrm{O}}_{3}{)}_{1\ensuremath{-}x}({\mathrm{PbTiO}}_{3}{)}_{x}$, $x=0.1$ [PMN/PT (90/10)], is found to exhibit several regimes of complicated aging behavior. Just below the susceptibility peak there is a regime exhibiting rejuvenation but little m…
We have studied photoluminescence and resonant Raman scattering of single-walled carbon nanotubes (SWNTs) consisting of carbon-13 $({\mathrm{SW}}^{13}\mathrm{CNTs})$ synthesized from a small amount of isotopically modified ethanol. There was almost no change in the Raman spectra shape for ${\mathrm{SW}}^{13}\mathrm{CN…
Discotic liquid crystals can self-align to form one-dimensional semiconducting wires, many tens of microns long. In this letter, we describe the preparation of semiconducting films where the stacking direction of the disc-like molecules is perpendicular to the substrate surface. We present measurements of the charge c…
A model describing the exchange-biased asymmetric giant magneto-impedance in Joule-heated amorphous wires is proposed. It is assumed that the Joule heating results in the formation of a surface hard magnetic crystalline layer, and the asymmetric giant magneto-impedance is related to the exchange coupling between the a…
Emphasizing the contribution of Professor Roger A Cowley, FRS to the Theory of Raman Scattering from crystals, the development of the Theory of Raman cattering since 1928 has been briefly discussed. Some experimental studies of Strontium Titanate using Inelastic Neutron Scattering, Raman Scattering, Electro- paramagne…
Regioregular polythiophene-based conductive copolymers with highly crystalline nanostructures are shown to hold considerable promise as the active layer in volatile organic compound (VOC) chemresistor sensors. While the regioregular polythiophene polymer chain provides a charge conduction path, its chemical sensing se…
In this communication, we demonstrate a new approach to sensitization of Ru-polypyridine complexes by using semiconductor nanocrystal quantum dots (NQDs). When mixed in solution, the complexes functionalized by carboxylic groups adsorb onto the surface of the NQDs. Excitation of NQDs by 400 nm light leads to fast, 5 p…
An oxidative chemical vapor deposition (CVD) process is presented as an alternative to conventional solution-based processing of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films. This solventless technique yields PEDOT with higher conductivities and conformally coats fibers and other high area morphologies, importa…
The electronic structure, defect chemistry, and transport properties of members of the mixed ionic electronic conducting SrTi 1 - x Fe x O 3 - y (STF) solid-solution system are revisited, and an improved defect chemical model is proposed in which Fe is considered to be one of the main constituents that shape the energ…
The x-ray crystal structure of a 194-kDa fragment from module 5 of the 6-deoxyerythronolide B synthase has been solved at 2.7 Angstrom resolution. Each subunit of the homodimeric protein contains a full-length ketosynthase (KS) and acyl transferase (AT) domain as well as three flanking "linkers." The linkers are struc…
Spherical silver nanoparticles with various sizes and standard deviations were synthesized by the polyol process. Two different synthesis methods were compared in order to investigate the influence of reaction parameters on the resulting particle size and its distribution. In the precursor heating method, wherein a so…
Results of detailed investigations of ${\mathrm{Mg}}_{2}{B}^{\mathrm{IV}}$ $({B}^{\mathrm{IV}}=\mathrm{Si},\phantom{\rule{0.3em}{0ex}}\mathrm{Ge},\phantom{\rule{0.3em}{0ex}}\mathrm{Sn})$ compounds and their quasibinary alloys are presented. Our analysis revealed that ${\mathrm{Mg}}_{2}\mathrm{Si}\text{\ensuremath{-}}{…
An oxygen-rich carbon for supercapacitors has been obtained by one-step carbonization of a natural biopolymer from seaweeds, e.g., sodium alginate. Although the specific surface area of this carbon is very low, it gives a capacitance comparable to the best activated carbons available. Due to its low porosity (see figu…
Abstract Nanocasting is a powerful method for creating materials that are more difficult to synthesize by conventional processes. We summarize recent developments in the synthesis of various structured porous solids, covering silica, carbon, and other nonsiliceous solids that are created by a nanocasting pathway. Stru…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionRing-Opening Polymerization of Lactides Initiated by Zinc Alkoxides Derived from NNO-Tridentate Ligands. Volume 39, Number 11, May 30, 2006, pp 3745−3752.Hsuan-Ying Chen, Hui-Yi Tang, and Chu-Chieh LinCite this: Macromol…
Microchannel devices are a rapidly evolving process technology with a wide variety of applications. One of these is separation processes such as kidney dialysis, which promises to significantly improve treatment and patient lifestyle. Current membranes for dialysis are hollow fiber membranes typically using polysulfon…
Cellulose surface modification is reviewed from the standpoint of the importance of interfacial modification for the development of strong cellulose reinforcement (nanowhiskers, wood fiber, or continuous fiber) in thermoplastic matrices. While continuous fiber composites did not require interfacial modification for im…
Plant stem fibers primarily contain cellulose, hemicellulose, pectin, and lignin. These are bundles of cellulose nanofibers with a diameter ranging between 10 to 70 nm and lengths of thousands of nanometers. The mechanical performance of the cellulose nanofibers is comparable to other engineering materials such as gla…
Since the use cellulose whiskers, cellulose microfibrils, and cellulose fibres of micro- and nano-scale diameters as reinforcing agents in composites is increasing rapidly, there is a need to review the microstructure of cellulose in great detail. In this paper, the concept of "microfibres" of cellulose has been devel…