Materials Literature
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We report the formation of monomeric and aggregated tetrakis( p -sulfonatophenyl)porphyrin encapsulated within an aluminosilicate mesostructure, specifically MCM-41, under different pH conditions. It was necessary to stabilize the synthesized MCM-41 through use of a silylation reagent, (aminopropyl)triethoxysilane, wh…
The effect of crystalline morphology on the hydrolytic degradation behavior of poly(butylene succinate) (PBS) in an alkaline solution was investigated by using scanning electron microscopy, gel permeation chromatography, and weight loss measurement. Morphological changes were induced on PBS samples by different therma…
The internal friction of oxide-ion conductor La 2 Mo 2 O 9 has been measured using a computer-controlled torsion pendulum. Two internal friction peaks were observed around 380 K and 833 K respectively at a vibration frequency of 1 Hz and a heating rate of 5 K min -1 . The lower-temperature peak is of relaxation type a…
A simple multiplicative scheme is proposed for the evaluation of the second-order nonlinear susceptibility of molecular crystals from the knowledge of the first hyperpolarizability of small molecular clusters. The principle of this new scheme is illustrated at the semiempirical AM1 level for 3-methyl-4-nitroaniline cr…
The present paper reports on the study of the disaccharides' dynamics in aqueous solutions and discusses the role of their interaction with water, which seems to be responsible for the protective action on biological membranes and tissues. In particular, using QENS (IRIS at ISIS, RAL, U.K.) we compared the quasielasti…
$o\ensuremath{-}{\mathrm{HoMnO}}_{3}$ crystallizes in the ${\mathrm{GdFeO}}_{3}$-type structure (Pbnm) with no crystal structure anomalies below 295 K and with the Mn-O-Mn angle as low as 144.1\ifmmode^\circ\else\textdegree\fi{}. The ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Ho}}^{3+}$ magnetic moments are ordered below ${T}…
The electronic structure of ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3},$ which is a major constituent of the best thermoelectric material operating at room temperature, was calculated by using the first principles full-potential linearized-augmented-plane-wave method with spin-orbit interaction included by a second variation…
Lamellar dehydroxylation mechanisms are important in understanding highly reactive nanocrystal oxide formation as well as a variety of applied lamellar hydroxide reaction processes. These mechanisms have been observed for the first time via in situ nanoscale imaging for the prototype lamellar hydroxide: Mg(OH) 2 . Env…
The electrostatic charge and photoionization characteristics of 5-nm CdSe nanocrystals were directly observed with electrostatic force microscopy (EFM) in dry air at room temperature. Measurements were made on individual nanocrystals, as well as on those in self-assembled rafts. Nanocrystals are initially charge neutr…
The syntheses and structural and physical characterization of the compounds [Cu(bipy)(2)](2)[Mo(CN)(8)].5H(2)O. CH(3)OH (1) with bipy = 2,2'-bipyridine and M(II)(2)[Mo(IV)(CN)(8)].xH(2)O (2 with M = Cu, x = 7.5; 3 with M = Mn, x = 9.5) are presented. 1 crystallizes in the triclinic space group P1; (a = 11.3006(4) A, b…
The effects of free surfaces on the dynamic critical behavior of isotropic Heisenberg ferromagnets are studied via phenomenological scaling theory, field-theoretic renormalization group tools, and high-precision computer simulations. An appropriate semi-infinite extension of the stochastic model J is constructed, the…
Abstract Synergististic and catalytic effects in flame retardancy technology are reviewed. An attempt is reported to define and determine the synergistic effectivity (SE) and the catalytic effectivity (CAT‐EFF) of a number of systems operating according to the accepted mechanism. Synergistic effects in the halogen bas…
Bis(hexylmethyldithio-/diselenocarbamato)cadmium(II)/zinc(II) (M(E 2 CNMe n Hex) 2 [M = Zn, Cd; E = S, Se]) have been used as single-source precursors for the preparation of TOPO-capped CdS, CdSe, ZnS, and ZnSe nanoparticles. The precursors are stable for long periods of time and pyrolyse cleanly to give high yields o…
Rutherford backscattering and channeling measurements have been applied to study deep radiation damage and depth profile of implanted Au atoms in pure Cu and Cu-1 at. % Ni alloy single-crystal specimens, which were irradiated off axis at room temperature by 300 keV ${\mathrm{Au}}^{+}$ ions to a dose of $2\ifmmode\time…
The interaction between sodium dodecyl sulfate (SDS) and preadsorbed lysozyme at the hydrophilic silicon oxide−water interface has been studied using specular neutron reflection. Measurements were carried out using two different solution concentrations of lysozyme and a range of SDS solution concentrations between 0.2…
The monobutyl ester of H8DOTP, the ligand H4DOTPMB, was synthesized, and the protonation constants (KHi) and the stability constant of Gd(DOTPMB) were determined by pH-potentiometry (25 °C, 0.1 M Me4NCl): logKHi, (i = 1, 2, and 3) = 10.34(0.02), 7.72(0.025), and 2.42(0.030), respectively, and logKGdL = 12.19(0.05). Th…
An antimony-substituted polyoxomolybdate, [PSbIII(H2O)Mo11O39]4−, of the α-Keggin structure, has been synthesized. Although the molecular structure is typical, we have found from the analysis of the X-ray diffraction data that the crystal is anisotropic with alignment of the molecular units so that the substituted ant…
Diamond nucleation by biased hot filament chemical vapor deposition was investigated by scanning electron microscopy and atomic force microscopy. It was found that a number of microdefects were produced on a substrate surface owing to energetic ion bombardment under negative substrate bias, which increased with increa…
Microporous dodecahedral aggregates of a polyoxotungstate were synthesized by homogeneous precipitation from aqueous solution using hydrolysis of urea at 373 K (H 3 PW 12 O 40 + 3 / 2 (NH 2 ) 2 CO + 3 / 2 H 2 O → (NH 4 ) 3 PW 12 O 40 ↓ + 3 / 2 CO 2 ). The aggregates isolated after various reaction periods were charact…
Two polymorphous compounds with the general formula [Cu(NCS)2(dpk·CH3OH)]n (dpk = di-2-pyridyl-ketone) have been synthesised and have been characterised both structurally and magnetically. The dpk·CH3OH ligand is the result of the metal-promoted solvolysis of dpk in methanol and acts as a neutral donor. X-ray analysis…