Materials Literature
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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…
A soluble model of weakly coupled "molecular" and "nuclear" Hamiltonians is studied in order to exhibit explicitly the mechanism leading to the enhancement of fusion probability in case of a narrow near-threshold nuclear resonance. We, further, consider molecular cells of this type being arranged in lattice structures…
We measured transverse and longitudinal dielectric permittivities of KDP and DKDP in the piezoelectric resonance frequency region under the hydrostatic pressure. The transverse permittivity decreases with pressure in the paraelectric phase and increases in the ferroelectric phase. The pressure dependence of the transv…
The influence of coherent interface on dissipations of mechanical energy of driven dislocations near to a point of martensite type phase transition is considered. The expressions for dynamic braking of dislocations, owing to losses of energy on excitation of deformations-type phase transition are received.
Self-similar measures for quasicrystals by M. Baake and R. V. Moody Fourier analysis of deformed model sets by G. Bernuau and M. Duneau Mathematical quasicrystals and the problem of diffraction by J. C. Lagarias Designer quasicrystals: Cut-and-project sets with pre-assigned properties by P. A. B. Pleasants Generalized…
The surface enhancement of the Raman scattering (SERS) is based on two major mechanisms. First, the optical resonance of the incident light with the metallic surface leads to the excitation of localized surface plasmons and the enhancement of the local electromagnetic field. Second, optical resonances of the energy le…