Materials Literature
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A versatile low-temperature chemical approach utilizing an alkoxide-based hydrazide process was developed for the synthesis of nanometer-size aluminum nitride, oxynitride, and composite powders. The process consists of reacting aluminum tri- sec -butoxide and anhydrous hydrazine in acetonitrile at 80 °C to yield solid…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTβ-KMP2Se6 (M = Sb, Bi): Kinetically Accessible Phases Obtained from Rapid Crystallization of Amorphous PrecursorsJean D. Breshears and Mercouri G. KanatzidisView Author Information Department of Chemistry, Michigan State University East Lansing, Michigan 48824 Cite thi…
Cytochrome c peroxidase (CcP) can bind as many as two cytochrome c (Cc) molecules in an electrostatic complex. The location of the two binding domains on CcP has been probed by photoinduced interprotein electron transfer (ET) between zinc-substituted horse cytochrome c (ZnCc) and CcP with surface charge-reversal mutat…
Hyperbranched aromatic polyamide copolymers were prepared by direct polycondensation of 3-(4-aminophenoxy)benzoic acid (AB monomer) and 3,5-bis(4-aminophenoxy)benzoic acid (AB 2 monomer) in the presence of triphenyl phosphite and pyridine as condensation agents. The structure of resulting polymers was confirmed by IR,…
Particle detectors made from artificial diamond have great promise for future experiments in particle physics because they are far less vulnerable to radiation damage than any other detector type. We review the history of diamond detectors and describe their current state of development. We also discuss the evidence w…
Recent studies of charge-transfer salts of the ion bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) are reviewed, focusing in particular on experimental techniques which involve high magnetic fields and on data obtained since 1996. Novel experimental techniques developed in the past few years, including angle-de…
The Hybrid Monte Carlo algorithm is adapted to the simulation of a system of classical degrees of freedom coupled to non self-interacting lattices fermions. The diagonalization of the Hamiltonian matrix is avoided by introducing a path-integral formulation of the problem, in $d+1$ Euclidean space-time. A perfect actio…
The anomalous Darwin term, one of the recently derived relativistic corrections to the conventional theory of superconductivity, is analysed in detail. A new derivation of this term, much simpler than that given originally, is presented and used to interpret the term physically, in terms of fluctuations of the relativ…
We have constructed maximally-localized Wannier functions for prototype structures of solid molecular hydrogen under pressure, starting from LDA and tight-binding Bloch wave functions. Each occupied Wannier function can be associated with two paired protons, defining a ``Wannier molecule''. The sum of the dipole momen…
The spectral properties of La$_{1-x}$Sr$_{x}$TiO$_{3}$, a doped Mott insulator with strong Coulomb correlations, are calculated with the ab initio computational scheme LDA+DMFT(QMC). It starts from the non-interacting electronic band structure as calculated by the local density approximation (LDA), and introduces the…
Cu1-xMgxGeO3 undergoes a first-order phase transition at a critical concentration xc between an antiferromagnetic (AF) state on dimerized lattice (D-AF) and an AF Neel state on undistorted uniform lattice (U-AF). Previous magnetic susceptibility measurements showed xc = 0.023 while a recent neutron scattering study re…
Ab initio formulations of the interlayer exchange coupling (IEC) between two, in general non-collinearly aligned magnetic slabs embedded in a non-magnetic spacer are reviewed whereby both the spacer and the magnetic slabs as well as their interfaces may be either ideal or random. These formulations are based on the sp…
We present dynamic Monte Carlo simulations of a lattice-gas model for bromine electrodeposition on single-crystal silver (100). This system undergoes a continuous phase transition between a disordered phase at low electrode potentials and a commensurate c(2X2) phase at high potentials. The lattice-gas parameters are d…
Conversion of 1,2-dihydroxyl groups to dialdehyde by periodate oxidation is a useful method of derivatizing polysaccharides but has not been extensively utilized in derivatization of cellulose because of complicacy due to the crystalline nature of cellulose. To understand the influence of cellulose crystallinity on th…
Ab initio QCISD(T)/6-311+G(3df)//MP2/6-31+G(d) calculations of potential energy surface for the reaction of Mg atoms with CO 2 show that re-forming of carbon dioxide to carbon monoxide can be significantly enhanced in the presence of Mg atoms. The overall endothermicity of the Mg + CO 2 → MgO + CO reaction is calculat…
A series of polyanhydrides based on o-, m-, and p- xylenes as derived from o- and p- hydroxybenzoic acids were synthesized by melt-condensation polymerization. Precursors, monomers, and polymers were characterized by NMR and IR spectroscopies, elemental and thermogravimetric analyses, and thermal transition temperatur…
A new mixed lead zirconium oxalate, Pb 2 Zr(C 2 O 4 ) 4 · n H 2 O (3 < n < 9), has been prepared from precipitation of a nitric solution of lead and zirconium cations by an oxalic solution at 345 K. The crystal structure of Pb 2 Zr(C 2 O 4 ) 4 ·6H 2 O has been determined ab initio from powder diffraction data collecte…
Reactions of chlorides RuCl(CO)(PCP) ( 1; PCP = [2,6-(CH 2 PBu t 2 ) 2 C 6 H 3 ] - ) and RuHCl[1,3-(CH 2 PBu t 2 ) 2 C 6 H 4 ] ( 2 ) with [Bu 4 N]BH 4 in ethanol afforded the hydrides RuH(CO)(PCP) ( 3 ) and [RuH(PCP)] 2 (μ-N 2 ) ( 5a ), respectively. Complex 5a exists in equilibrium with the dinitrogen species [RuH(N…
A novel poly[di(4-heptyl) vinylterephthalate] has been synthesized based upon a free radical polymerzation from a newly designed monomer having a nonmesogenic template with two double-swallow-tailed 4-heptyl (Y-shaped) groups. The resulting polymer consists of a polyethylene backbone and a 2,5-bis(4-heptyloxycarbonyl)…
We present a unified theory for pump-probe spectra in highly excited semiconductors, which is applicable throughout the whole density regime including the high-density electron-hole BCS state and the low-density excitonic Bose-Einstein condensate (BEC). The analysis is based on the BCS-like pairing theory combined wit…