Materials Literature
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Abstract During high temperature (150-300 degrees C) dolomitization experiments the rate of dolomitization increases with temperature, reactant surface area, reactant solubility, ionic strength and Mg (super 2+) /Ca (super 2+) of the solution. One would predict these results from simple kinetic theory. The discoveries…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical Transformations and Facile Disproportionation of Sulfur Dioxide on Transition Metal ComplexesGregory J. KubasCite this: Acc. Chem. Res. 1994, 27, 7, 183–190Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 19…
This paper focuses on the preparation and characterization of pure TiO 2 and ZrO 2 xerogels. The preparation method is based on a sol–gel technique using metal tert ‐amyloxides as precursors to produce nano‐sized metal oxide particles which are subsequently packed in a gelation process, eventually resulting in micropo…
ABSTRACT Fundamental theory of surface chemistry was utilized to develop an equation for calculating initial interfacial tension between a product and liquid. The relationship provides a practical approach to overcome the complexity of quantitatively determining interfacial tension of foods. The range of interfacial t…
In this work we explore the possibilities of the gel-acupuncture technique, proposed previously for the growth of protein single crystals [García-Ruiz, Moreno, Viedma & Coll (1993). Mater. Res. Bull. 28, 541-546]. The main advantage of the technique is that the crystals are obtained inside an X-ray capillary and, unli…
Pressure-induced structural transformation and the concomitant loss of intermediate-range order (IRO) in high-density ${\mathrm{SiO}}_{2}$ glass are investigated with the molecular-dynamics (MD) approach. The MD simulations cover a wide range of mass densities---from normal density (2.20 g/${\mathrm{cm}}^{3}$) to the…
Dual-mode microwave/radio frequency plasma-enhanced chemical-vapor deposition allows one to decouple ion bombardment effects from processes in the discharge volume. This approach has been used to deposit three types of hydrogenated amorphous films at low substrate temperature and high deposition rate (∼10–20 Å/s): SiN…
A novel route to organic ferromagnetic materials is proposed that is based on the stability of spin‐containing organometallic moieties such as ferricenium and the electronic or topological interactions contributed by a polymer. The magnetic properties of the new high‐spin polymers (see Figure) are shown to be sensitiv…
A polydisperse suspension with a particle size distribution from submicrometer to hundreds of micrometers is treated as bimodal, wherein it is made up of a colloidal fine fraction and a noncolloidal coarse fraction. According to the bimodal model, the fine fraction imparts to the suspension its non-Newtonian character…
Nanoparticles of ZrO 2 with diameters ranging from 4 to 8 nm were synthesized by gas condensation. As‐prepared n ‐ZrO 2 particles have a monoclinic and a high‐pressure tetragonal structure depending on size. Pure ZrO 2 was sintered to full density under vacuum at 04 T m within the monoclinic phase field. Final grain s…
The synthesis and photoluminescence mechanism of are presented. Monitored at 450 nm, exhibits an absorption band at 245 nm; monitored at 506 nm exhibits absorption bands at 245 and 283 nm. Under 254 nm excitation exhibits a broad‐band emission extending from 360 to 610 nm, peaking at 450 nm. This emission is gradually…
Ultrasonically driven vibrating files are known to enhance the efficiency of root canal debridement. This paper presents a phenomenological view of the hydrodynamic response of an oscillating ultrasonic file and the relationship between the file response and various physical factors such as file size and curvature, fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElementary Reaction Mechanism for Growth of Diamond (100) Surfaces from Methyl RadicalsSergei Skokov, Brian Weiner, and Michael FrenklachCite this: J. Phys. Chem. 1994, 98, 28, 7073–7082Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Publis…
Solid polymer electrolytes consisting of complexes of poly(ethylene oxide)‐grafted poly(methyl)‐methacrylate (PEO‐PMMA) and tetraalkylammonium salts [tetrabutylammonium perchlorate, tetraethylammonium perchlorate, and tetraethylammonium tetrafluoroborate (TEABF 4 )] have been investigated for electric double‐layer cap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophases of a Diblock Copolymer with Conformational AsymmetryM. W. Matsen and M. SchickCite this: Macromolecules 1994, 27, 14, 4014–4015Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Characterization, and Properties of High Molecular Weight Unsymmetrically Substituted Poly(ferrocenylsilanes)Daniel Foucher, Ralf Ziembinski, Ruth Petersen, John Pudelski, Mark Edwards, Yizeng Ni, Jason Massey, C. Raimund Jaeger, G. Julius Vancso, and Ian MannersC…
27 Al NMR spectra of CaO–Al 2 O 3 liquids at 2500 K have been obtained using a recently developed technique that involves CO 2 laser heating and sample levitation inside the NMR magnet. The spectra consist of single, narrow lines (100 to 200 Hz FWHM), indicating that rapid chemical exchange among molecular species occ…
The structure of E. coli adenylate kinase with bound AMP and AMPPNP at 2.0 A resolution is presented. The protein crystallizes in space group C2 with two molecules in the asymmetric unit, and has been refined to an R factor of 20.1% and an Rfree of 31.6%. In the present structure, the protein is in the closed (globula…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the Self-Adhesion Hysteresis of a Siloxane Elastomer Using the JKR MethodPascal Silberzan, Susanne Perutz, Edward J. Kramer, and Manoj K. ChaudhuryCite this: Langmuir 1994, 10, 7, 2466–2470Publication Date (Print):July 1, 1994Publication History Published online1 Ma…
To solve or prevent copper pitting problems, it is first necessary to achieve a clearer understanding of copper corrosion theory, parts of which are currently not supported by practical experience. Some current theories of copper pitting are contradicted by practical experience. Although it has been theorized that chl…