Materials Literature
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Abstract Vanadium pentoxide gels, V 2 O 5 ·1.6H 2 O, give rise to xerogel layers that exhibit a preferred orientation. X‐ray diffraction of this xerogel displays the 00 l peaks typical of a turbostratic stacking of the V 2 O 5 ribbons along a direction parallel to the substrate. The distance along the c ‐axis is obser…
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A new method for calculating the total instrumental function of a conventional Bragg–Brentano diffractometer has been developed. The method is based on an exact analytical solution, derived from diffraction optics, for the contribution of each incident ray to the intensity registered by a detector of limited size. Bec…
Abstract Transmetalation of a dimeric homotrinuclear zinc(II) complex [(3-MeOsalamo)2Zn3] with Lu3+ and La3+ afforded heterometallic dinuclear [(3-MeOsalamo)ZnLu]3+ and trinuclear [(3-MeOsalamo)2Zn2La]3+ complexes, respectively, whose structures were determined by X-ray crystallography. The transmetalation process was…
A short study has been conducted to examine the efficiency of different alkaline reduction‐clearing conditions on Ingeo [poly(lactic acid)] fibres, dyed with disperse dyes. The results indicate that the preferred conditions are 15 min at 60 °C in the presence of 2 g/l sodium carbonate and 2 g/l ‘hydros’, conditions wh…
Four Schiff base esters containing the different substituents of R=CN, OH, SH, and NO2 were synthesized, and the physical characterization was carried out along with spectroscopic techniques (FT-IR and NMR). Thermal properties were analyzed by using differential scanning calometry (DSC), and their liquid crystal textu…
Bistable switching effect, induced by an electric field, in an anodic porous alumina thin film is reported. An electrode was bonded on the surface of a thin film with Ag paste, and I-V characteristic between the electrode and the aluminium substrate was measured The I-V characteristic reveals a reversible resistance c…
Due to the small size, sensitivity, real time detection, and ultra-low power demands, nanowire sensors are being investigated for detection of a wide range of chemical and biochemical species. However, techniques used to fabricate these nanowire sensors have drawbacks of limited controllability and manufacturability.…
Resonant third-order nonlinear optical susceptibility and hyperpolarizability of CdSe nanocrystal quantum dots were revealed to be ∼2.6 × 10 −20 – 2.7 × 10 −19 m 2 /V 2 and ∼2.2 × 10 −40 m 5 /V 2 by using nanosecond degenerate four-wave mixing at 532 nm. The large nonlinearity of the CdSe nanocrystals is attributed to…
Cholesteric liquid crystals are known to possess bandgap and exhibit strong reflection for one of two circular polarizations of light. We suggest a periodically twisted nematic liquid crystal as a medium, which possesses bandgap and exhibits strong reflection for any polarization of normally incident light. Two possib…
Computational fluid dynamics (CFD) is a powerful simulation tool that was successfully used to investigate mixing, turbulence, and shear in a laboratory-scale MSMPR and batch cooling crystallizer for an organic fine chemical. CFD gives a qualitative engineering insight into the effects of the impeller configuration on…
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…