Materials Literature
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A broad continuum-like spin excitation (1--10 meV) with a peak structure around 2.4 meV has been observed in the ferroelectric $ab$ spiral spin phase of Gd$_{0.7}$Tb$_{0.3}$MnO$_3$ by using terahertz (THz) time-domain spectroscopy. Based on a complete set of light-polarization measurements, we identify the spin excita…
The search for the resonating valence bond (RVB) state continues to underpin many areas of condensed matter research. The RVB is made from the dimerisation of spins on different sites into fluctuating singlets, and was proposed by Anderson to be the reference state from which the transition to BCS superconductivity oc…
We analyze the wide angle x-ray scattering from oriented spider silk fibers in terms of a quantitative scattering model, including both structural and statistical parameters of the $β$-sheet crystallites of spider silk in the amorphous matrix. The model is based on kinematic scattering theory and allows for rather gen…
Abstract The current global energy problem can be attributed to insufficient fossil fuel supplies and excessive greenhouse gas emissions resulting from increasing fossil fuel consumption. The huge demand for clean energy potentially can be met by solar-to-electricity conversions. The large-scale use of solar energy is…
BACKGROUND: Long-term patency of conventional synthetic grafts is unsatisfactory below a 6-mm internal diameter. Poly(epsilon-caprolactone) (PCL) is a promising biodegradable polymer with a longer degradation time. We aimed to evaluate in vivo healing and degradation characteristics of small-diameter vascular grafts m…
Abstract Recent advances in the chemistry of colloidal semiconductor nanocrystal doping have led to new materials showing fascinating physical properties of potential technological importance. This article provides an overview of efforts to dope one of the most widely studied colloidal semiconductor nanocrystal system…
Microcapsules containing reactive diisocyanate for use in self-healing polymers are successfully fabricated via interfacial polymerization of polyurethane (PU). Isocyanates are potential catalyst-free healing agents for use in humid or wet environments. The preparation of PU prepolymer and microencapsulation of isopho…
The subchronic inhalation toxicity of silver nanoparticles was studied in Sprague-Dawley rats. Eight-week-old rats, weighing approximately 253.2 g (males) and 162.6 g (females), were divided into four groups (10 rats in each group): fresh-air control, low dose (0.6 x 10(6) particle/cm(3), 49 microg/m(3)), middle dose…
This paper reports a simple, one-pot, template-free synthesis of flower-like Au nanoparticles (three-dimensional branched nanoparticles with more than 10 tips) with high yield and good size monodispersity at room temperature. The size of the Au nanoflowers could be tuned by controlling the composition of the starting…
A new surface bioconjugation strategy is presented. A polydopamine surface coating provides chemical activation on material surfaces, is resistant to hydrolysis, and offers selectivity in coupling of biomolecules via nucleophilic groups through simple pH control. Control of orientation of immobilized biomolecules may…
Chlorins with highly substituted exocyclic double bonds extending the chromophoric system were synthesized starting from the readily accessible oxochlorin. After sulfurization of the keto function of oxochlorin 7 the formed thioketo chlorin 8 underwent Barton olefination with diazo compounds.
Hydrogen embrittlement tests were performed on 0·254 mm diameter BS 5216 M4 high strength carbon steel wire using constant loads to give initial tensile stresses in the range 48–91% ultimate tensile stress. The wires were electrolytically charged with hydrogen in 4%H2SO4 at current densities of 75 and 150 mA cm–2. The…
We discuss models for massless Dirac fermions being subjected to a perpendicular magnetic field in spherical geometry. These models are analogs of Haldane's spherical construction for massful charge carriers. The single-particle states constructed here are easily implemented in existing numerical code for many-body pr…
The susceptibility to sulphide stress corrosion cracking (SSCC) of four conditions of shielded metal arc welding repairs and one as welded specimen of the girth weld in seamless API X-52 microalloyed steel pipe were evaluated using slow strain rate tests. The slow strain rate tests were performed in air and in a NACE…
Leather making involves conversion of a putrefiable skin or hide protein (collagen) into nonputrescible material. Environmental concerns have forced the leather industry to develop tanning systems based on natural products. Vegetable tanning is one of the oldest methods of tanning. However, there is limitation in the…
Hypervelocity impact of spherical and cylindrical projectiles on multipate shields at velocities between 4 and 6km∕s was investigated experimentally. A model was developed to describe the motion of the debris clouds generated. Good agreement was obtained between the experimental and simulation results. The model is ca…
In this study, polystyrene/polypropylene (PS/PP) reinforced coconut and jute fibers were prepared by injection moulding. The total fiber content was fixed at 10wt% with the ratios of 100/0, 75/25, 50/50, 25/75 and 0/100 weight of coconut fiber/jute fiber. The effects of reinforced coconut and jute fibers on mechanical…
Reaction of H 2 phpzR (R = H, Me, Ph; H 2 phpzH = 3(5)-(2-hydroxyphenyl)pyrazole, H 2 phpzMe = 3(5)-(2-hydroxyphenyl)-5(3)-methylpyrazole, and H 2 phpzPh = 3(5)-(2-hydroxyphenyl)-5(3)-phenylpyrazole)) with MnCl 2 ·2H 2 O or MnBr 2 ·4H 2 O in an acetonitrile−methanol mixture and in the presence of a small quantity of t…
Dynamically vulcanized EPDM/PP (ethylene-propylene-diene/polypropylene) elastomers reinforced with various amounts of organoclay were prepared using octylphenol-formaldehyde resin and stannous chloride dehydrate as vulcanizing agents. The effects of organoclay on vulcanization characteristics, rheological behavior, mo…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSilk Fiber Formation after High-Pressure Treatment of Fibroin Solution in a Diamond Anvil CellRonald Gebhardt, Charlotte Vendrely†, Michael Hanfland, and Christian Riekel*View Author Information European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France*…