Materials Literature
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A comprehensive theoretical study of the structure and magnetic properties of Cr-doped GaN nanotubes yields some interesting and unexpected results: (1) A single wall GaN nanotube constructed from the GaN wurtzite crystal relaxes to a carbon-like zigzag SWNT structure and remains stable at $300\phantom{\rule{0.3em}{0e…
We report neutron diffraction experiments on the light-induced metastable state $S$I in single crystals of ${\mathrm{Na}}_{2}[\mathrm{Fe}{(\mathrm{CN})}_{5}\mathrm{NO}]∙2{\mathrm{D}}_{2}\mathrm{O}$. It is shown that the metastable state $S$I corresponds to a linkage isomer of the NO group, the so-called isonitrosyl co…
The theory developed by Caglioti and co-workers [Caglioti, Paoletti & Ricci (1958). Nucl. Instrum. 3 , 223–228; Caglioti, Paoletti & Ricci (1960). Nucl. Instrum. Methods , 9 , 195–198; Caglioti & Ricci (1962). Nucl. Instrum. Methods , 15 , 155–163] and Sabine [(1987). J. Appl. Cryst. 20 , 23–27, 173–178] t…
In this work we report some new nonclassical carbonyls of iridium formed after CO adsorption on Ir-ZSM-5 (Ir-MFI). Mainly Ir+ cations were found on sample activated at 523 K and reduced by CO at the same temperature. With CO they formed Ir+(CO)2 gem-dicarbonyls (2104 and 2033 cm(-1)) that decomposed at 673 K without l…
Twelve different microcrystalline insulin formulations were investigated by X-ray powder diffraction and were shown to have very characteristic patterns. Three of the formulations crystallize in the same crystal system, but have structural differences in the N-terminal B-chain of the insulin molecule. This difference…
The yttrium local environment in the series of pyrochlores Y2Ti2-xSnxO7 was studied using 89Y NMR. Oxides with the pyrochlore structure exhibit a range of interesting physical and chemical properties, resulting in many technological applications, including the encapsulation of lanthanide- and actinide-bearing radioact…
Pyrazinamide was condensed with the poly(ethylene glycol)-poly(aspartic acid) copolymer (PEG-PASP), a micelle-forming derivative was obtained that was characterized in terms of its critical micelle concentration (CMC) and micelle diameter. The CMC was found by observing the solubility of Sudan III in Poly(ethylene gly…
Ni/4H-SiC Schottky photodiodes of 5 mm x 5 mm area have been fabricated and characterized. The photodiodes show less than 0.1 pA dark current at -4 V and an ideality factor of 1.06. A quantum efficiency (QE) between 3 and 400 nm has been calibrated and compared with Si photodiodes optimized for extreme ultraviolet (EU…
A salient manifestation of anisotropy in the mechanical response of polycrystalline materials is the inhomogeneous partitioning of elastic strains over the aggregate. For bulk samples, the distributions of these intergranular strains are expected to have a strong functional dependence on grain orientations. It is then…
A simple and efficient alcohol thermal technique was applied to control the growth of the dimensions and morphology of ZnO nanostructures under mild conditions, where surfactant was not necessary. The size of ZnO nanocrystals increased with growth temperature and they transformed into nanorods with different aspect ra…
Series of elongated Schiff base esters containing three aromatic rings with palmitoyl moiety as one of the terminal carbon chain and various substituents R(R=H, F, Cl, Br, OCH3, CH3, and C2H5) at the other end of molecule have been isolated, and their structures were proposed via physical measurement. The mesomorphic…
Supramolecular chiral columnar liquid crystals have been formed through one-dimensional self-assembly of pyrene-containing oligopeptides. Supramolecular chirality is further tuned by cooperation of intermolecular hydrogen bonding and electron donor-acceptor interactions. [reaction: see text]
A miscible polymer/polymer system, poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM), was subjected to dynamic vulcanization to yield an oil- and heat-resistant thermoplastic elastomer (TPE). The morphology of the TPE has been investigated by small-angle X-ray scattering (SAXS), dynamic mechanical analysis (DMA),…
The compounds Ba 2 LnMoO 6 (Ln = Nd, Sm, Eu, Gd, Dy, Y, Er, and Yb) have been synthesized by solid-state techniques under reducing conditions at temperatures up to 1300 °C. Rietveld analyses of X-ray and neutron powder diffraction data show that these compounds adopt cation-ordered perovskite phases. At room temperatu…
Push-pull indole-containing nonlinear optical chromophores with different acceptor and pi-conjugated moieties have been synthesized and characterized. Experimental measurements of the second-order nonlinear optical response demonstrated that the chromophores exhibit similar or superior optical nonlinearity compared wi…
We use molecular-dynamics simulations to study processes related to resistance to amorphization by radiation damage. We simulate high-energy radiation events in ${\mathrm{SiO}}_{2}$, ${\mathrm{GeO}}_{2}$, ${\mathrm{TiO}}_{2}$, ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$, and $\mathrm{MgO}$, and find that simulation results ma…
Abstract PbO–Nb 2 O 5 –P 2 O 5 glasses containing different concentrations of V 2 O 5 ranging from 0 to 1.0 mol% were prepared. A number of studies, viz. differential thermal analysis, infrared, optical absorption, Raman and ESR spectra and dielectric properties (dielectric constant ϵ ′, loss tan δ , a.c. conductivity…
The green emission band of ZnO has been investigated by both experimental and theoretical means. Two sets of equally separated fine structures with the same periodicity (close to the longitudinal optical (LO) phonon energy of ZnO) are well resolved in the low-temperature broad green emission spectra. As the temperatur…
Porcine and recombinant human atelocollagen I solutions were cross-linked with a water soluble carbodiimide at various stoichiometries and collagen concentrations (5-20 w/w %). The resulting hydrogels were clear and, when used as cell growth matrices, allowed cell and nerve visualization in vitro and in vivo. We have…
A biodegradable polyester elastomer, poly(1,8-octanediol citrate) (POC), is used to modify the lumen of expanded polytetrafluoroethylene (ePTFE) grafts via a spin-shearing method followed by interfacial in situ polycondensation. We demonstrate successful surface modification of ePTFE grafts without affecting graft com…