Materials Literature
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Coherent neutron-scattering experiments on liquid cesium and rubidium near the melting point reveal an anomalous dispersion of collective modes for frequencies \ensuremath{\omega}${\mathrm{\ensuremath{\tau}}}_{\mathit{M}}$\ensuremath{\gg}1 with ${\mathrm{\ensuremath{\tau}}}_{\mathit{M}}$ the Maxwell relaxation time fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of the first .alpha.-linked quaterpyrroleHidetsugu Ikeda and Jonathan L. SesslerCite this: J. Org. Chem. 1993, 58, 8, 2340–2342Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/doi…
Abstract Comparing the state of reaction advancement of I/S (illite content of illite/smectite mixed layer minerals) and organic matter (vitrinite reflectance) in instances of high temperature gradients allows one to observe the evolution of geologic materials under extreme conditions. In a geothermally heated sedimen…
Electrical conductivities of aluminum nitride (AIN) doped with various ions of different sizes and valences have been measured at elevated temperatures. Grain conductivities of samples doped with large cations, obtained from complex impedance patterns, were much higher than those doped with small cations. The temperat…
Aluminum nitride/boron nitride composite was synthesized by using boric acid, urea, and aluminum chloride (or aluminum lactate) as the starting compounds. The starting materials were dissolved in water and mixed homogeneously. Ammonolysis of this aqueous solution resulted in the formation of a precomposite gel, which…
Octylcyanobiphenyl, a bilayer smectic A liquid crystal at room temperature, was deposited on gratings, grids, and flat surfaces, and was studied using high-resolution x-ray scattering at shallow angles of incidence. One surface of the film was in contact with air and the other was in contact with the glass or silicon…
New preparative routes to the title compounds are reported in which the yields are substantially improved over previous methods. In one method, reaction of O 2 with a mixture of XC 6 H 4 CN 2 S 2 + Cl − and Ph 3 Sb leads to the products in 40–60% yield. In another, the reaction of the same salts with silylated amidine…
Surface-enhanced Raman scattering (SERS) spectra of three different classes of adsorbates have been analyzed: (1) native and denatured calf thymus DNA and adenine, as examples of molecules with electronic transitions in the UV region only; (2) flavine adenine dinucleotide (FAD) and doxorubicin (DOX), as examples of ch…
The precipitation sequence of the discontinuous and continuous modes in Cu–0·9Be and Cu–1·4Be binary alloys (compositions in wt-%) has been studied primarily via metallographic observations and hardness measurements. A single C curve and triple C curves separated by two temperatures T 1 and T 2 (T 1 >T 2 ) are obta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis by laser ablation and characterization of pure germanium-carbon alloy thin filmsHaojie Yuan and R. Stanley WilliamsCite this: Chem. Mater. 1993, 5, 4, 479–485Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 Apr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and chemistry of the active copper species derived from CuI.cntdot.PBu3, CuI.cntdot.PPh3, and CuCN.cntdot.nLiX complexesReuben D. Rieke, Douglas E. Stack, Bryan T. Dawson, and Tse Chong WuCite this: J. Org. Chem. 1993, 58, 9, 2483–2491Publication Date (Print):Apr…
A new solution method has recently been developed to analyze the ther mal and structural response of polymeric composites during chemical decomposition. This method extends the numerical approach of previous researchers by including the solution for the structural response of the decomposing material. The method coupl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and bonding of indium clusters: A3Na26In48 (A = K, Rb, Cs) with a novel cubic network of arachno- and closo-In12 clustersSlavi C. Sevov and John D. CorbettCite this: Inorg. Chem. 1993, 32, 9, 1612–1615Publication Date (Print):April 1, 1993Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyselenide chemistry of indium and thallium in dimethylformamide, acetonitrile, and water. Syntheses, structures, and properties of the new complexes [In2(Se4)2(Se5)]4-, [In2Se2(Se4)2]2-, and [In3Se3(Se4)3]3-Sandeep S. Dhingra and Mercouri G. KanatzidisCite this: Inorg. Ch…
Abstract Phase distribution of quenched samples has been determined by a deconvolution procedure of WAXS spectra in a wide range of cooling rates. The informations collected together with isothermal and DSC results provide a very wide set of data on the crystallization kinetics of polymers relevant which covers condit…
Self‐organization phenomena are observed in most real systems. Is this true also for colloidal or microemulsion systems? It is argued that the current general practice of assuming that polymeric and non‐polymeric colloidal systems are in equilibrium is not valid and that non‐equilibrium thermodynamics should be applie…
Abstract The kinetics of decomposition of [Alg · Mn VI O 4 2− ] intermediate complex have been investigated spectrophotometrically at a constant ionic strength of 0.5 mol dm −3 . The decomposition reaction was found to be first‐order in the intermediate concentration. The results showed that the rate of reaction was b…
Povondraite, previously the tourmaline ferridravite, is redelined. It is rhombohedral, R3m. with a = 16.186(2) and c = 7.444(1) A. The new chemical formula, derived by crystal structure analysis, is (Nao.8oKo26)~Lo6 (Fe~18Fe517M&53)~3.0S (Fe~19MgL36Alo32)~'97B3Si'9602788 (OH)312 and the ideal end-member formula is NaF…
Abstract Smectite was reacted at several temperatures between 200°C and 500°C to produce interstratified illite/smectite (I/S) with different proportions of expandable layers. Dispersed and sedimented products were examined using a transmission electron microscope. Particle size and aspect ratio showed no systematic c…
Diffraction patterns of synthetic Co-akermanite, Ca 2 CoSi 2 O 7 , reveal distinct satellite reflections at room temperature. An incommensurate modulation in this material has been determined by five-dimensional refinement pf the structure. The basic structure is tetragonal P42 1 m, unit-cell dimensions a=7.8417 (6),…