Materials Literature
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Two mixed-chalcogen compounds LaCuSTe and SmCuSTe have been synthesized by the reactions of the elements at 1123 K. LaCuSTe crystallizes in a cell of dimensions a = 6.4955(8) Å, b = 7.7692(9) Å, c = 7.4665(9) Å, and beta = 95.045(2) degrees (T = 153 K) with four formula units in space group C(2)(h)()(5)-P2(1)/c of the…
Thermoplastic blends of several biodegradable polymers with lignin and lignin esters were prepared by solvent casting and melt processing. Among the biodegradable thermoplastics were cellulose acetate butyrate (CAB), a starch-caprolactone copolymer/blend (SCC), and poly(hydroxybutyrate) (PHB). Lignin esters included t…
Layered double hydroxides (LDHs) with the formula [Mg 0.7 Al 0.3 (OH) 2 ](NO 3 ) 0.3 were partially exchanged with MoO 4 2- and WO 4 2- and were used as heterogeneous catalysts for the decomposition of H 2 O 2 into singlet molecular oxygen ( 1 O 2 ). The oxometalate anions are present on the LDH as monomeric, tetrahed…
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A novel family of mesoporous oxides of rare earth metals (Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) were synthesized with specific surface areas of 253-348 m(2) g(-1) and pore diameters of 2.5-3.0 nm (see Scheme). The mesoporous solids and their surfactant mesophase precursors are paramagnetic and exhibit a magnetic anomaly due…
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Two different porous hydrogen-bonded networks are formed by self-assembly of the radially substituted host 1. In the network of type A, formed by 1 small middle dot4 Et(2)O, all OH groups of 1 are involved in hydrogen bonding, and the molecular sheets are stacked without translation to generate extended channels that…
We report that nematic liquid crystals (LCs) of 4-cyano-4‘-pentylbiphenyl (5CB) and p -methoxybenzylidene- p - n -butylaniline (MBBA) can be used to image reactants and products of reversible, acid−base reactions on surfaces with micrometer resolution. When supported on obliquely deposited films of gold, azimuthal ori…
An intermolecular enantioselective photoreaction by a single-crystal-to-single-crystal transformation has been carried out for the first time, as is evident from X-ray structure analysis and X-ray powder diffractometric studies. This reaction, the dimerization of the title compound to cyclobutane derivative 1 (X=O, S)…
Reversible release or reabsorption of water like sponges, a process which is accompanied by a dramatic change of structure and magnetic properties, can be achieved by some molecular magnetic materials. When the sponges are hydrated, or wet, the structure consists of isolated units with a nonmagnetic ground state. When…
We investigate the adsorption of chlorine on the Cu(111) surface with full potential all-electron density functional calculations. Chlorine adsorption at the fcc hollow sites is slightly preferred over that at the hcp hollow. The adsorption geometry is in excellent agreement with electron diffraction and ion scatterin…
We investigate the electronic structure of over-coordinated defects in amorphous silicon via density-functional total-energy calculations, with the aim of understanding the relationship between topological and electronic properties on a microscopic scale. Maximally-localized Wannier functions are computed in order to…
A detailed investigation of the acid doping behavior of polyaniline has led to a robust and reproducible procedure for controlled adjustment of the redox state of dry polyaniline films. The initial step in this procedure is the casting of PANI films from formic acid. The subsequent exchange of the trapped formic acid…
Polar dyes can be solubilized in apolar media—molecular nanocapsules with hydrophilic interiors have been prepared (see schematic representation) using polyglycerols with narrow polydispersity and simple esterification with fatty acids. These unimolecular micelles offer attractive potential for a variety of applicatio…
A series of conjugated zinc porphyrin oligomers, from the dimer through to the hexamer, form stable ladder complexes with linear bidentate ligands such as 1,4-diazabicyclo[2.2.2]octane (DABCO) and 4,4‘-bipyridyl (Bipy). The 1 H NMR spectra of these ladders confirm their structures and show how they fray and dissociate…
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The glide motion of a dislocation line is considered in a crystal undergoing a first-order phase transition. Within the hysteresis temperature range a trail of a metastable phase can nucleate at the dislocation and act as a dry-friction force. The strength of this force depends on the angle between the Burgers vector…
Rare-earth elements (REE)-bearing sector-zoned lawsonite was found in Sanbagawa pelitic schists in the Ise area of the eastern Kii Peninsula, central Japan. The pelitic schists consist mainly of lawsonite, chlorite, phengite, titanite, albite, quartz, calcite and weakly-ordered graphite. Metamorphic conditions are est…