Materials Literature
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The syntheses and characterization of silicate/surfactant thin films with the structure P 6 3 / mmc is presented. The films are synthesized using a novel double-headed quaternary amine surfactant and can be grown either on mica or at the air−water interface. Films are shown to be crystalline and oriented with the c -a…
Intramolecular H-atom-transfers (IHTs) in curcumin (enol) and its mimic, 1,6-heptadiene-3,5-dione (enol), in ground state and excited state were investigated by ab initio and CIS methods in this paper. It is revealed that double ortho-methoxy-phenolic rings have little effect on the IHT barrier of curcumin, and the IH…
A study of specific features in the kinetics of thermoluminescence (TL) of defective α -Al 2 O 3 crystals is reported. The TL properties are experimentally shown to be related to the presence of oxygen vacancies of thermochemical or radiation origin. It is established that the differences in the TL kinetics in α -Al 2…
The permeation of protium, deuterium, and an equimolar deuterium-tritium mixture through finger-type Pd-Ag permeators of various configurations operated either in/out or out/in has been compared in parametric studies. The parameters included the permeate pressures; the feed-and-bleed flow rates; and the feed-gas compo…
Despite many years of research, the detailed atomic structure of many important carbon materials remains poorly understood. In particular, the structure of those carbons which can not be transformed into graphite by high temperature heat treatment has never been clearly established. These non-graphitising carbons are…
Abstract The effects influencing the migration of different small molecular materials in polyethylene (PE) were studied. A decrease in weldability experienced after storage of the polymer at ambient and elevated temperatures was proved to be a result of migration of low molecular mass components of the polymer and som…
The dehydration reaction kinetics of tincal and borax decahydrate was investigated by thermogravimetry (TG) and differential thermal analysis (DTA). Various methods were used to analyze the TG and DTA data for determination of reaction kinetics. The activation energy, frequency factor, and order of reaction were calcu…
Unpolarized single‐crystal Raman spectra in the temperature interval of 298–1235 K and powder X‐ray diffractometry data from room temperature up to 1295 K have been obtained from a natural triclinic wollastonite of almost‐ideal composition. Room‐temperature spectra, along with the temperature dependencies of nine majo…
High-temperature annealing of thick silver films (TSFs) deposited onto a smooth dielectric substrate leads to high-order self-organization of metal clusters on the film surface. A comparative atomic force microscopic (AFM) analysis of “as-deposited” and annealed TSFs (aTSFs) shows that uniform ellipsoidal roughness ∼4…
Poly(N-vinylcarbazole), poly(N-carbazole) and poly(N-ethylcarbazole) powders were chemically synthesized by the reaction of ceric ammonium nitrate (CAN) with N-vinylcarbazole carbazole and N-ethylcarbazole in acetonitrile. Products were characterized by elemental analysis, Fourier transform infrared spectroscopy, scan…
ABSTRACT Equilibrium vapor pressures of allyl isothiocyanate (AIT) above pure AIT and AIT/canola oil mixtures from 15 to 45°C were estimated from AIT vapor densities using gas chromatography. Canola oil was an effective diluent for depressing AIT vapor pressure. Permeation of AIT in a PVDC/PVC copolymer film was measu…
The influence of sulfate‐reducing bacteria (SRB) on the passivity of type 304 austenitic stainless steel was investigated using x‐ray photoelectron spectroscopy (XPS) and electrochemical techniques. Multiple samples were exposed to a SRB culture, Desulfovibrio desulfuricans , and then resultant changes in the surface…
The silicone-based formulations now in use by Raychem have been specially developed for electrical insulating applications. They have undergone many years of development and optimization to yield exceptional electrical and weathering performance properties, comparable to the polyolefin copolymer materials. The intent…
Short unbranched alkanes, such as heptane and hexane, prefer extended conformations. Polythene chains prefer folded conformations. How long a chain can be built before the global minimum conformation ceases to be linear? The question is a difficult one, because exhaustive conformation searches on molecules of the size…
Abstract Modification of a poly(L‐lactide) (PLLA) base resin, by treatment with peroxides and compounding with plasticisers, yield resins which can be processed by conventional techniques and equipment to thin blown films, fibres and nonwoven fabrics having properties comparable to those of corresponding PP and PE sam…
The development of camber during the cofiring of a two‐layered structure of Ni‐electrode/BaTiO 3 ‐dielectric as a function of temperature has been investigated. At a given thickness of Ni electrode, less camber and camber rate with increasing thickness of BaTiO 3 dielectric have been observed. This phenomenon is attri…
A series of 1,2-1,4-polybutadienes with varying 1,2 (vinyl) content was investigated using time-domain dielectric spectroscopy. The time range was 10−5–300 s, which can be converted by Laplace transform to a frequency range of 10−3–6000 Hz. The samples were the same as those used in a previous rheological study from t…
Preparation methods for TiO 2 /PbS “coupled” type nanoparticles are described, in which PbS is formed in - situ on the surface of TiO 2 . FTIR was used to follow the preparation process and UV−vis spectra confirmed the stabilizing effect of TiO 2 on the formation of PbS nanoparticles. This “coupled” type of nanopartic…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotochemical P-450 Oxygenation of Cyclohexene with Water Sensitized by Dihydroxy-Coordinated (Tetraphenylporphyrinato)antimony(V) HexafluorophosphateShinsuke Takagi, Minako Suzuki, Tsutomu Shiragami, and Haruo InoueView Author Information Department of Industrial Chem…
Abstract Atomistic simulation calculations are used to predict the solution mechanisms and the defect cluster geometries of: M 2+ dopant cations in Y 2 O 3 , M 3+ dopant cations in CoO and M 2+ dopant cations in SrTiO 3 . The interatomic potential parameters were derived by simultaneously fitting the properties of a r…