Materials Literature
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A textile made up of an organic-inorganic hybrid fibre containing 70% cellulose and 30% silicic acid was used as a raw material for the preparation of the thermostable support for combustion catalysts. The hybrid textile was burnt to obtain a pure knitted silica fibre. The surface area and crystallinity of this fibre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectrochemical Investigations on Naphthalocyanine Derivatives in Thin FilmsHisao Yanagi, Yoshihiro Kanbayashi, Derck Schlettwein, Dieter Woehrle, and Neal R. ArmstrongCite this: J. Phys. Chem. 1994, 98, 17, 4760–4766Publication Date (Print):April 1, 1994Publication His…
Abstract The mechanisms of thermal degradation of poly(ether‐ketone) (PEK) and four poly(ether‐ketone)/poly(ether‐sulfone) copolymers (PEK/PES) have been investigated by direct pyrolysis‐mass spectrometry (DPMS). Several families of pyrolysis compounds with H, OH and CHO end‐groups have been identified in the pyrolysi…
The density; molar volume; thermal expansion coefficient; dissolution rate in water, HC1, and NaOH; glass transition and crystallization temperatures; and the absorption edge in the ultraviolet‐visible and infrared were measured for PbO─BiO1.5─GaO1.5 glasses. The range of compositions investigated was x PbO (100 − (x…
Longitudinal P-31 relaxation rate enhancements of phosphate groups have been measured at pH 7-7.2 and 310 degrees K on aqueous solutions containing adenosine triphosphate (ATP), phosphocreatine (PCr), inorganic phosphate (Pi) and some lanthanide complexes (Gd-DOTA, Gd-HPDO3A, Gd-DO3A, Gd-DTPA, Gd-DTPA-BMA). The macroc…
Second harmonic generation, an important phenomenon in nonlinear optics, is modeled in this work. The model is derived from a nonlinear system of Maxwell’s equations, which overcomes the known shortcomings of some commonly used models in the literature. Existence and uniqueness of solutions are established by a combin…
Oxidation behavior of chemically vapor‐deposited SiC in CO─CO 2 atmospheres (0.1 MPa) was investigated using a thermogravimetric technique at temperatures from 1823 to 1923 K. Active or passive oxidation was observed depending on temperature and CO 2 /CO partial pressure ratio ( P co2 / P co ). The critical P co2 / P…
Highly polarizable Ba x Sr 1- x TiO 3 ( x =0∼1) (BSTO) thin films have been grown heteroepitaxially by the ArF excimer laser ablation method. They were characterized by X-ray diffraction, reflection high-energy electron diffraction (RHEED), capacitance-voltage ( C - V ), Fourier transform infrared (FTIR) and UV spectr…
We have identified the director configurations n(r) of nematic droplets subjected to electric fields under conditions of negative dielectric anistropy and parallel surface anchoring. Drops are examined using polarization microscopy, with electric fields applied parallel or perpendicular to the light direction. The beh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on Dilithium Initiators. 3. Effect of Additives and SeedingG. Y.-S. Lo, E. W. Otterbacher, A. L. Gatzke, and L. H. TungCite this: Macromolecules 1994, 27, 8, 2233–2240Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissu…
Different anticorrosive schemes applied over plain or previously shot-blasted surfaces of AISI 1010 (UNS G10100) steel plates were compared. Plates were painted with alkydic, vinylic, and epoxy anticorrosive schemes over metal treated previously with pine tannin reaction primer and over its own schemes without previou…
Commercial silicon nitride powder with A1 2 O 3 and Y 2 O 3 additives was hot‐pressed to complete density. The resulting microstructure contained elongated grains with no trace of remaining α‐Si 3 N 4 . The aspect ratio of the elongated grains increased with increasing soak time at a fixed hot‐pressing temperature. X‐…
Abstract The thermal dissociation of urethane groups has been studied by FTIR spectroscopy depending on the type of diisocyanate, the structure of the hard segment and the composition of polyurethane. Independent of the composition and the structure, the dissociation started between 150 and 160°C. Consequently, the di…
Abstract The hydrolysis of 2-(2-trichlorosilylethyl)pyridine (TCSEP) or 3-aminopropyltrimethoxysilane (APTMS) yields a complex mixture of oligomers, the composition of which is a function of time. 29 Si NMR measurements show that the same oligosilsesquioxanes can be obtained from both compounds after prolonged hydroly…
We have measured the adiabatic elastic constants of two Cu-Al-Ni martensitic alloys using ultrasonic methods and we have compared the results to recent neutron-scattering experiments. It is shown that the elastic behavior of Cu-Al-Ni alloys follows the same trends exhibited by other Cu-based alloys; in particular, the…
The microstructure and Cu distribution were determined for blanket and patterned Al(≤4 wt % Cu) thin films as a function of annealing. The growth of Θ-phase (Al2Cu) precipitates in blanket and patterned submicrometer-wide lines was quantified along with the Cu concentrations within the Al grains. The reliability of 0.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyanines of a Novel Structure: Dinaphthotetraazaporphyrins with D2h SymmetryNagao Kobayashi, Tohru Ashida, Tetsuo Osa, and Hideo KonamiCite this: Inorg. Chem. 1994, 33, 9, 1735–1740Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Pub…
P. A. Scolnik, G. E. Bartley; Nucleotide Sequence of an Arabidopsis cDNA for Geranylgeranyl Pyrophosphate Synthase, Plant Physiology, Volume 104, Issue 4,
V2O5 gels produced by sol-gel methods have several potential uses in electronics and catalysis, but the rate and mechanism of the synthesis remain poorly understood. Recent results disagree with models previously proposed. 51V NMR spectra show that the initial reactions involve the consumption of the dioxovanadium cat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-Valent Nickel Thiaporphyrins. Nuclear Magnetic Resonance and Electron Paramagnetic Resonance StudiesPiotr J. Chmielewski, Lechoslaw Latos-Grazynski, and Ewa PacholskaCite this: Inorg. Chem. 1994, 33, 9, 1992–1999Publication Date (Print):April 1, 1994Publication History P…