Materials Literature
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Various types of molecular bearings have recently been proposed in the growing nanotechnology literature. Using novel molecular dynamics methods, we have simulated several model graphite bearings. The bearings varied in size from inner shafts of between 4 and 16 A in diameter, up to 120 A in length, and outer cylinder…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Spectroscopic Properties of Bismuth Citrate Compounds and the Bismuth-Containing Ulcer-Healing Agent Colloidal Bismuth Subcitrate (CBS). 4. Crystal Structure and Solution Behavior of a Unique Dodecanuclear Cluster (NH4)12[Bi12O8(cit)8](H2O)10Eiji As…
SiC fibers were synthesized from polycarbosilane (PCS) fibers by heat treatment after electron beam irradiation curing. The pyrolysis reaction mechanisms from the organic PCS to ceramic SiC were investigated by the analysis of gases evolved during heat treatment. There were two steps in the major reaction: the first s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical and Electrochemical Properties of cis-1,2-Dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)etheneTakashi Koshido, Tsuyoshi Kawai, and Katsumi YoshinoCite this: J. Phys. Chem. 1995, 99, 16, 6110–6114Publication Date (Print):April 1, 1995Publication History Published online1…
A compact electron-spin-polarization manipulator is described which allows one to align the polarization in any desired direction in space. The system delivers a focused electron beam of typically 3–5 keV. Its application in spin-polarized low-energy electron microscopy for the study of magnetic domain structures is b…
The capture kinetics and trapping properties of a dislocation related electron trap detected in strain-relaxed, compositionally graded Ge0.3Si0.7/Si grown by rapid thermal chemical-vapor deposition are investigated by deep-level transient spectroscopy (DLTS). The volume DLTS trap concentration scales linearly with the…
Increasing volumes of synthetic polymers are manufactured for various applications. The disposal of the used materials is becoming a serious problem. Unlike natural polymers, most synthetic macromolecules cannot be assimilated by microorganisms. Although polymers represent slightly over 10% of total municipal waste, t…
The properties of a highly selective chemical etchant composed of hydrofluoric acid, hydrogen peroxide, and acetic acid ( HF : H 2 O 2 : CH 3 COOH ) is investigated in etching SiGe / Si heterostructures. This solution has been found to etch Si 1 − x Ge x much faster than Si over the entire range of Ge contents. The et…
The AC-DC transfer differences of thermal converters due to thermoelectric effects in the heater circuit are directly measured with a fast reversed DC to an uncertainty of a few parts in 10/sup 7/. This new and independent method allows former theoretical methods for evaluating thermoelectric effects in thermal conver…
Abstract The consistent parameters of hexagonal zinc oxide single crystals are obtained in the frame of the one‐oscillator model by analyzing the dispersion spectra of IR light reflection. The anisotropy coefficients of the electron effective masses and the plasmon damping Coefficients are measured. The calculated val…
Abstract The correlation between illite/smectite (I/S) diagenesis and mean vitrinite reflectance (R o ) data is examined in mudrocks from a hydrocarbon exploration well (geothermal gradient 35°C km −1 ) from the Great Hungarian Plain of the Pannonian Basin System. The expandability of I/S decreases with depth and ther…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonoclinic .tautm. Hexagonal Phase Transition in Hydroxyapatite Studied by X-ray Powder Diffraction and Differential Scanning Calorimeter TechniquesHiroyuki Suda, Masatomo Yashima, Masato Kakihana, and Masahiro YoshimuraCite this: J. Phys. Chem. 1995, 99, 17, 6752–6754Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable Shear-Induced Orientation of a Diblock Copolymer Hexagonal PhaseT. Tepe, M. F. Schulz, J. Zhao, M. Tirrell, F. S. Bates, K. Mortensen, and K. AlmdalCite this: Macromolecules 1995, 28, 8, 3008–3011Publication Date (Print):April 1, 1995Publication History Published on…
For investigation of the microbial accessibility of polyesters based on 1,3-propanediol, a series of different polymer structures (homo, random, and block copolymers) were synthesized by polycondensation of terephthalic acid, adipic acid, sebacic acid, and 1,3-propanediol. The alcohol component, 1,3-propanediol, can b…
Hydrophobic and anti-rain surface treatments are increasingly used to treat various glass articles such as windscreens, windows, headlamps, wing mirrors, optical lenses, sunglasses, etc. To evaluate the efficiency and durability of these treatments, we determine the smallest volume or critical sliding volume, V c , of…
Silk gland factor-1 (SGF-1) regulates transcription of the Bombyx sericin-1 gene via interaction with the SA site. In this study, two related SGF-1 polypeptides of apparent molecular masses of 40 and 41 kDa were purified. Specific interaction of these proteins with the SA site was demonstrated by electrophoretic mobil…
Abstract Inert gas condensation was used to generate nanocrystalline La‐doped CeO 2 − x . Non‐stoichiometric CeO 2 − x ‐based materials were found to be excellent catalysts in recent studies for the selective reduction of SO 2 . To understand better the stoichiometry‐related catalytic properties, the surface chemistry…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(anthraquinone)s Having a .pi.-Conjugation System along the Main Chain. Synthesis by Organometallic Polycondensation, Redox Behavior, and Optical PropertiesTakakazu Yamamoto and Hideki EtoriCite this: Macromolecules 1995, 28, 9, 3371–3379Publication Date (Print):April 1,…
Carbon steel specimens were exposed in carbon dioxide (CO2)-containing brine with different amounts of hydrogen sulfide (H2S) at 70°C and 80°C. The addition of 0.02 mmol/L sulfide, corresponding to 45 Pa (0.0065 psi) H2S partial pressure (PH2S), to brine with 70 kPa (10 psi) CO2 at pH 4.2 caused rapid formation of a p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSiloxane Coupling AgentsLeanne G. Britcher, David C. Kehoe, Janis G. Matisons, and A. Geoffrey SwincerCite this: Macromolecules 1995, 28, 9, 3110–3118Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995https://pub…