Materials Literature
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Single-walled carbon nanotubes (SWNTs) have been used as growth templates for spatially confined crystal growth. The comparative crystallization and high-resolution transmission electron microscopy imaging properties of simple binary halides formed by the alkali iodides MI (M = Li, K, Na, Rb and Cs) within SWNTs are d…
A new form of biomineralization in the pineal gland of the human brain has been studied. It consists of small crystals that are less than 20 /spl mu/m in length and that are completely distinct from the often-observed mulberry-type hydroxyapatite concretions. Cubic, hexagonal and cylindrical morphologies have been ide…
The influence of the welding process and post-welding heat treatment on the abrasive wear resistance of iron based hardfacing overlays (Fe–6Cr–0.5C) is reported. Overlays were deposited by shielded metal arc (SMA) and tungsten inert gas (TIG) welding processes on structural steel using a commercially available surfaci…
A mild, catalytic dehydrocoupling route to aminoboranes and borazine derivatives from either primary or secondary amine-borane adducts has been developed using late transition metal complexes as precatalysts. The dehydrocoupling of Me 2 NH·BH 3 was found to be catalyzed by 0.5 mol% [Rh(1,5-cod)(μ-Cl)] 2 in solution at…
Abstract A new series of molecule-based magnets, including crown thioether (9S3 = 1,4,7-trithiacyclononane) complexes of transition metals (Ni, Co, Cu), are presented. TCNQ salts [M(9S3)2](TCNQ)2 (M = Ni, Co) are one-dimensional (1D), antiferromagnetic (AF) complexes with an intra-chain interaction J = −3.9 K and −1.3…
Abstract Summary: A new photoluminescent poly(arylene ethynylene) containing 1,3,5‐triazine units was prepared by polycondensation between 2,4‐diphenyl‐6‐ N , N ‐bis(4‐bromophenyl)amino‐1,3,5‐triazine and 1,4‐didodecyloxy‐2,5‐diethynylbenzene using Pd(PPh 3 ) 4 and CuI as the catalysts in the presence of triethylamine…
Abstract Hydrogen and helium measurements in pure nickel irradiated to 100 dpa in HFIR at temperatures between 300 and 600°C show higher gas concentrations than predicted from fast-neutron reactions and the two-step 58Ni(n,γ)59Ni (n,p and n,α) reactions. This additional gas production suggests previously unidentified…
Collarets rich in single-walled carbon nanotubes (SWCNTs) have been grown using a direct current arc method. Arc process parameters such as current, pressure, and anode to cathode distance were varied experimentally and by modeling to provide an optimal working window. The best collaret yields were obtained when heliu…
Lanthanum modified PZT thin films with compositions, namely 8/60/40, 8/70/30, 10/70/30 and 12/70/30 were deposited on platinized silicon substrates by sol-gel spin coating technique. Characterization of these films by XRD and SEM show that the films possess perovskite phase with submicron crystallite size. The saturat…
Abstract In this paper the synthesis of some new chromophores which could be used in polymer/organic LED fabrication are presented. All of them are pyrazoloquinoline (PAQ) derivatives. Their emission properties were tuned by side group substitution. They were characterized by absorption and photoemission spectroscopy.…
Copper and its alloys (brass) represent an important type of material that meets the requirements of many industrial applications in chemical and power industries and nuclear stations. Like most metallic materials, brass alloys suffer from corrosion, especially from selective corrosion. Taking into account the conditi…
Technological features of the commercial production of detonation-synthesis nanodiamonds at the SINTA Joint-Stock Company and the characteristics of the nanodiamonds and diamond-containing mixtures produced are considered. Nanodiamond applications in the production of composite electrolytic coatings that are based on…
Permeation of hydrogen isotopes through a high-temperature alloy used for heat exchanger and catalyst pipes is an important problem in the hydrogen production system connected to the High-Temperature Engineering Test Reactor (HTTR). The objective of this study is to investigate the effect of the existence of hydrogen…
Crystalline copper phthalocyanine (CuPc) films have been fabricated by physical vapor deposition using a cylindrical furnace. Field effect transistors (FETs) of the crystalline CuPc film are fabricated by optimizing the deposition conditions. Crystal orientation along the electric field is enhanced by an application o…
This paper describes the synthesis and characterization of several liquid crystal compounds having a tolane or terphenyl core structure and a high polarizability, isothiocyanato (NCS), terminal group. The synthesized compounds have high optical birefringerce (0.35 and 0.52), the highest being exhibited by the olefin-t…
Rails are often joined by welding and about 80–90 per cent of tracks are welded using the flash-butt welding method. As the result of the welding process, high tensile residual stresses are induced in the web region of the rail, at and near the welded zone. Since the main part of the welded zone is coarse grained and…
Abstract The object of this work is to assess the suitability of metallocene catalyzed linear low‐density polyethylenes for the rotational molding of foams and to link the material and processing conditions to cell morphology and part mechanical properties (flexural and compressive strength). Through adjustments to mo…
Zinc oxide (ZnO) nanoparticles coated with 1–5 wt% Bi 2 O 3 were prepared by precipitating a Bi(NO 3 ) 3 solution onto a ZnO precursor. Transmission electron microscopy showed that a homogeneous Bi 2 O 3 layer coated the surface of the ZnO nanoparticles and that the ZnO particle size was ∼30–50 nm. Scanning electron m…
Reactions designed to give Se6[Sb(OTeF5)6]2 by the reaction of Se2Br2, 4Se, and 2Ag[Sb(OTeF5)6] lead to products that include [Ag2(Se6)(SO2)2][Sb(OTeF5)6]2(1). The distorted cubic (Ag2Se6 2+) n consists of a Se6 molecule bicapped by two silver cations (local D3d sym.). Reactions of AgMX6 (M = As, Sb) with selenium in…
The TM1255 gene of Thermotoga maritima encodes an aspartate aminotransferase (AspC-1, EC 2.6.1.1), with a molecular weight of 42,287 Da (residues 1–377) and a calculated isoelectric point of 6.8. Aminotransferases contain a pyridoxal 5′-phosphate (PLP) cofactor and are involved in the degradation of most amino acids w…