Materials Literature
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Summary Alumina/SiC nanocomposites were produced by mechanical mixture of commercial powders. The preparation steps involved the vigorous mixing of the powders and drying under conditions where the homogeneous mixture was kept stable. Pressureless sintering of die‐pressed powders achieved reasonable densities (∼97% th…
The temperature at which collagen denatures from a triple helix to a random coil structure is a useful measure of the degree of crosslinking. A new multi-sample denaturation temperature tester (DTT) has been constructed for rapid determination of the collagen denaturation temperature of natural tissues and collagenous…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective extraction of mercury with ionizable crown ethers in supercritical carbon dioxideShaofen. Wang, Sadik. Elshani, and C. M. WaiCite this: Anal. Chem. 1995, 67, 5, 919–923Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published ini…
Quantitative determination of phase abundances using X-ray powder diffraction is a technique in wide use today. Of the various methods employed, the Chung, or RIR method, is one of the most common because it can provide reliable results for all sample types. However, improvements can be made to the Chung method of ana…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Transition and Structural Asymmetrization in the Ferromagnetic Compound [{Ni2(Medpt)2(N3)2}(.mu.-(1,1-N3)2)], an Example of a Dynamic Second-Order Jahn-Teller EffectAlbert Escuer, Ramon Vicente, Joan Ribas, and Xavier SolansCite this: Inorg. Chem. 1995, 34, 7, 1793–…
Condensed phases of Langmuir monolayers are treated in the framework of the Landau theory of phase transitions as a result of successive ordering of the hexatic phase. All types of ordering allowed by symmetry and the couplings between them are described. The phase diagrams and x-ray structural data on monolayers of v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanion-Supported Catalyst Precursors. Synthesis and Characterization of the Iridium(I) and Rhodium(I) Precatalysts [(n-C4H9)4N]5Na3[(1,5-COD)M.cntdot.P2W15Nb3O62] (M = Ir, Rh)Matthias Pohl, David K. Lyon, Noritaka Mizuno, Kenji Nomiya, and Richard G. FinkeCite this: In…
Journal of physical chemistry
The correlation between the molecular structure and inhibitor efficiency (Ei) of triamines was investigated. The group-contribution approach was adapted to account for Langmuir- and Frumkin-type inhibition. The group contributions (aj) were obtained using a nonlinear regression technique. It was assumed that corrosion…
As part of ongoing studies in polyurethane biostability and biodegradation, we have investigated an in vitro system to test strained poly(etherurethane urea) (PEUU). Recently, we utilized this system to reproduce in vivo stress cracking in strained Pellethane. In this study, strained PEUU was tested to determine wheth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFabrication of Patterned, Electrically Conducting Polypyrrole Using a Self-Assembled Monolayer: A Route to All-Organic CircuitsChristopher B. Gorman, Hans A. Biebuyck, and George M. WhitesidesCite this: Chem. Mater. 1995, 7, 3, 526–529Publication Date (Print):March 1, 1995Pu…
Several absorbance peaks in electrically unwound, uniform smectic-${\mathit{C}}^{\mathrm{*}}$ (Sm-${\mathit{C}}^{\mathrm{*}}$) were studied as a function of polarization direction of incident ir radiation by using homogeneously and homeotropically aligned cells of four antiferroelectric liquid crystals. Contrary to th…
Abstract Aging experiments using the NIST (National Institute of Standards and Technology) torsional dilatometer have been performed in which the temperature of an isothermally equilibrated epoxy glass was abruptly changed to a new temperature T 0 and the evolution of the volume and torsional relaxation responses reco…
We report direct femtosecond measurements of the dynamics of photoinduced electrons at the liquid–metal interface produced by exciting the surface plasmon band of aqueous silver colloidal particles. The electron plasma resonance created initially dephases into individually excited electrons in less than 150 fs. This i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of Iron(III) Porphyrins with Oxidants. Structure-Reactivity StudiesTeddy G. Traylor, Cheal Kim, Joseph L. Richards, Feng Xu, and Charles L. PerrinCite this: J. Am. Chem. Soc. 1995, 117, 12, 3468–3474Publication Date (Print):March 1, 1995Publication History Publishe…
Quantum chemical calculations can provide reliable information on the geometric and electronic structures of a variety of advanced materials wich can be used to design or predict their electrical or optical properties. The success of the approach does not always depend on the use of the most sophisticated calculationa…
A structural investigation of liquid D2O was performed by neutron scattering at pressures up to 6 kbar and in a range of temperatures from 53 down to −65 °C. Some comparison is made with Monte Carlo (MC) and molecular dynamics (MD) simulations. In particular, the results are used to test some recent MD simulations lea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen Bonding in Organometallic Crystals. 2. C-H.cntdot. .cntdot. .cntdot.O Hydrogen Bonds in Bridged and Terminal First-Row Metal CarbonylsDario Braga, Fabrizia Grepioni, Kumar Biradha, V. R. Pedireddi, and Gautam R. DesirajuCite this: J. Am. Chem. Soc. 1995, 117, 11, 31…
Abstract The Raman intensity of K 2 MCl 6 (M = Pt or Sn) was analysed using the many‐body model, which treats the interaction among induced dipoles. The result was satisfactory of K 2 PtCl 6 , but not for K 2 SnCl 6 . Some improvements to the model were made. It is concluded that the preferred method for analysing sim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRare Earth Metal Boron Carbide MBC Compounds Containing Monodimensional Branched Zigzag Chains of non-metal Atoms: Theoretical AspectsFabrice Wiitkar, Samia Kahlal, Jean-Francois Halet, Jean-Yves Saillard, Josef Bauer, and Peter RoglCite this: Inorg. Chem. 1995, 34, 5, 1248–…