Materials Literature
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In this contribution, experimental data are presented on the solubilities and partition coefficients of two semi-synthetic antibiotics (amoxicillin, ampicillin) and their precursors ( d -phenylglycine, d -( p -hydroxy)phenylglycine, 6-aminopenicillanic acid) in water + 1-butanol mixtures at a constant temperature of 2…
Multidomain samples of ferroics (ferroelectrics, ferroelastics, and related materials) with fixed geometrical distribution of domains can offer new macroscopic properties required for particular applications. Two extreme cases of such applications are defined. In domain-geometry-engineered samples of ferroic crystals,…
The experimentally observed anomalies in temperature dependences of the Hall coefficients and the electrical resistivities for hot-pressed samples of Ge1-xAgx/2Bix/2Te with 0.095<x<0.333, due to the ferroelectric lattice instabilities in the phase transition region, are discussed. The Landau-Lifschitz type criterion f…
In this study, CaBPO5 was synthesized by different solid state reactions than reported before and its X-ray powder diffraction and IR data were reported. In one of these solid state reactions BPO4 was used as a phosphating agent. The examination of the X-ray powder diffraction data showed that this compound crystalliz…
The complex perovskite lead iron niobate, Pb(Fe 1/2 Ta 1/2 )O 3 (PFT), has been studied by neutron powder diffraction. Following collection of diffraction data at 300 K and at 10 K, structural refinements have been carried out by means of the Rietveld method. A straightforward unit cell of symmetry R 3 m was obtained…
The hydrophobicity of the mesoporous FSM-16 surface was studied by measurements of adsorption isotherms and heats of adsorption of water at 298 K. The hydrophobic−hydrophilic change on the surface derived by water adsorption was also studied. The water adsorption isotherm of freshly prepared FSM-16 was of type V and t…
Synthesis and characterization of inverted porphyrins containing S, Se, and O are reported. A simple 3 + 1 MacDonald-type condensation using modified tripyrrane containing the N-confused ring and diols afforded various N-confused porphyrins 6a-f in 19-30% yield. The single-crystal X-ray structure of 6b shows a ruffled…
Magnetic and transport properties of ultrafine La 2/3 Ca 1/3 MnO 3 (LCMO) powders synthesized by mechanical alloying with a grain size of about 18 nm have been investigated. It is found that the powder sample is superparamagnetic above 95 K. The blocking temperature ( T B ) obtained from the characteristic peak in the…
Water molecule (H 2 O) adsorption on Si 8-10 clusters has been studied using the full-potential linear-muffin-tin-orbital method. The calculations show that water molecules can be adsorbed on some sites of the cluster surfaces. Their adsorption energies are situated in the ranges 0.01-0.49 eV for Si 8 , 0.14-0.24 eV f…
A previous study on B 12 N 12 showed that the Hartree−Fock (HF) method, local density approximation (LDA), and gradient-corrected density functional theory (specifically B3LYP) all agree in predicting that the cage isomer of B 12 N 12 is the most stable. If the cage is the most stable (BN) x for x = 12, then the energ…
Electrical transport measurements have been performed on doped and undoped TiCoSb half-Heusler phases. The semiconducting properties are found to be more robust than those reported for MNiSn (M = Ti, Zr, Hf ). Undoped TiCoSb phases exhibit large n-type Seebeck coefficients and high resistivities that reach -500 µV K -…
This article reviews the current status of lattice-dynamical calculations in crystals, using density-functional perturbation theory, with emphasis on the plane-wave pseudo-potential method. Several specialized topics are treated, including the implementation for metals, the calculation of the response to macroscopic e…
Isosteric heats of adsorption of pure SF 6 and CO 2 were calorimetrically measured on a sample of pelletized silicalite with alumina binder. The corresponding heats of adsorption on a sample of gamma alumina were also measured. The silicalite is a homogeneous adsorbent for these gases, but the presence of the binder i…
Isolation of a soluble [NHex4]+ salt has allowed a detailed electrochemical study of the anion alpha-[SMo12O40]2- to be undertaken. Four reversible one-electron-reduction processes are observed in CH2Cl2 solution. Controlled potential electrolysis led to isolation of tetraalkylammonium salts of the one-electron-reduce…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
An unusual compound, Ba4SiSb2Se11, was discovered from a reaction of Ba/Th/Sb/Se. It is assumed that Si was extracted from the silica reaction tube. It forms as silver needlelike crystals in the polar space group Cmc2(1) with a = 9.3981(3) A, b = 25.7192(7) A, c = 8.7748(3) A, and Z = 4. A rational synthesis has been…
Abstract. We study self-similar measures of Hutchinson type, defined by compact families of contractions, both in a single and multi-component setting. The results are applied in the context of general model sets to infer, via a generalized version of Weyl’s Theorem on uniform distribution, the existence of invariant…
The decay dynamics and the quenching of the photoluminescence (PL) from Si nanocrystals are investigated. Electron acceptors whose reduction potentials lie below the conduction band (CB) edge of the Si nanocrystals quench the red emission from the Si nanocrystals. The quenching rate constants obtained from Stern−Volme…
Laser interference lithography is a low-cost method for the exposure of large surfaces with regular patterns. Using this method, microsieves with a pore size of 65 nm and a pitch of 200 nm have been fabricated. The pores are formed by inverting a square array of photoresist posts with a chromium lift-off process and b…
Five chemically modified chitosans were tested for their antifungal activities against Saprolegnia parasitica by the radial growth assay in chitosan-bearing agar, and the fungal growth assay in chitosan-bearing broth. Results indicated that methylpyrrolidinone chitosan, N-carboxymethyl chitosan and N-phosphonomethyl c…