Materials Literature
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The low-temperature specific heat ${C}_{p}$ of vitreous B${}_{2}$O${}_{3}$ has been measured between 1.5 K and 25 K, for several B${}_{2}$O${}_{3}$ glasses with different thermal histories and water contents. A noticeable variation of the specific heat from glass to glass is found in the temperature range around the b…
The monopersulfate oxidation of 4-isopropylbenzoic acid performed in H(2)(18)O and catalyzed by a water-soluble metalloporphyrin indicated that half of the oxygen atoms incorporated in 4-(1-hydroxy-1-methylethyl)benzoic acid, the primary hydroxylation product, came from water. A redox tautomerism of the active high-va…
Pt/(Ba, Sr)TiO 3 /Pt capacitors were fabricated on TiN/Ti/ Poly –Si/SiO 2 /Si substrate by sputtering technique and effects of post-annealing conditions on the current vs. voltage ( I–V ) characteristics of the capacitors were investigated. It was found that leakage currents of Pt/BST/Pt capacitors were greatly depend…
The effects of concentration and modification of fibre surface in oil palm fibre-reinforced rubber composites have been studied. Modification of the fibre surface increased the physical properties of the rubber composites. Increasing concentration of oil palm fibre in the rubber matrix resulted in reduction of tensile…
Six different behavioral models for ferroelectric capacitors are surveyed with an emphasis on their usefulness in the transient circuit simulation of integrated nonvolatile memories. These models can be broadly classified into two categories, namely, those that rely on the hysteresis loop and those that rely on the sw…
Oxynitride films with continuous variations of the optical index with thickness were grown by electron cyclotron resonance plasma-enhanced chemical vapor deposition using silane as a silicon precursor and oxygen and nitrogen as plasma gases. Specific linear and parabolic index profiles were fabricated by computerized-…
A detailed surface chemistry model is presented for the reactions of N 2, O2, NO, N, and O on a silica surface. The model distinguishes adsorption, desorption, and recombination reactions according to the Eley‐ Rideal and Langmuir ‐ Hinshelwood mechanisms as well as dissociative adsorption reactions of the molecular s…
Abstract One of the challenges in building reaction mechanisms using algorithms for automated model construction is to describe the essential chemistry and enable prediction of experimental data over wide ranges of reaction conditions while maintaining a manageable model size. Two complementary methodologies for build…
Birefringence can be induced in Se films photocrystallized by linearly polarized light at \ensuremath{\sim}350 K. The birefringence reaches \ensuremath{\sim}0.1, which is approximately 1/10 of that in the hexagonal Se. X-ray-diffraction investigations suggest that the photothermally induced birefringence is caused by…
Multilayered composites consisting of LaPO 4 (La‐monazite) layers alternating with various ZrO 2 ‐based materials were fabricated to investigate whether LaPO 4 provides a weakly bonded interface suitable for promoting toughening, as previously observed in the system LaPO 4 /Al 2 O 3 . The following ZrO 2 ‐based materi…
A new heterotrinuclear complex of formula [Cu(2)Zn(Hdmg)(2)(dmg)(2)(H(2)O)].0.5H(2)dmg.H(2)O (C(18)H(34)Cu(2)N(9)O(11)Zn, 1) (H(2)dmg = dimethylglyoxime) has been synthesized and its crystal structure determined by single-crystal X-ray diffraction. It crystallizes in the triclinic system, space group P&onemacr;, with…
The oxidation and reduction behavior of complexes [(mpz)M(CN) 5 ] 2 - between the group 8 pentacyanometalates(II) and the N -methylpyrazinium ion mpz + was studied using spectroelectrochemical techniques (UV/vis/NIR, IR, EPR) in nonaqueous and, in part, aqueous media. As a further source of information on the electron…
We describe a relatively simple, reliable, and fast approach for quantitative surface analyses by x-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) that significantly improves the accuracy of analyses of polycrystalline solids. The common formalism of XPS and AES is based on the assumption,…
Abstract Facile, safe and efficient preparation of stable dispersions of gold nanoparticle from tetrachloroaureic(III) ion is achieved by simultaneous addition of citrate as reductant and sodium 3-mercaptopropionate as stabilizer. No rigorous cleanliness is needed and the reductant is decomposed to CO2. The particle s…
A series of carboxylated polypyrrole−silica microparticles were synthesized by copolymerizing pyrrole-3-acetic acid with pyrrole using a hydrogen peroxide-based oxidant in the presence of an ultrafine silica sol. The effect of varying the proportion of pyrrole-3-acetic acid in the comonomer feed on the physicochemical…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTToward Quantum Line−Self-Assembly Process of Nanomolecular Building Blocks Leading to a Novel One-Dimensional Nanomolecular Polymer: Single-Crystal X-ray Structure of {[H3O]+12{(H2O)MoO2.5[Mo36O108(NO)4(H2O)16]- O2.5Mo(H2O)}12-}nShi-Wei Zhang, Yong-Ge Wei, Qing Yu, Mei…
Diffusional transformations in Tix(Ni, Cu)1−x thin films, with x = 0.474, 0.492 and 0.510 and containing about 5 at.% Cu, have been studied in materials fabricated by triode magnetron sputtering at 473 K. As-deposited films were amorphous and crystallized during isochronal annealing by a polymorphic reaction to form a…
A unified synthetic strategy has allowed us to rationalize the preparative chemistry of the layered oxovanadium phosphates M(VOPO(4))(2).nH(2)O. Thus, we have been able to isolate as single phases with reasonable yields both all the previously characterized phosphates and a new solid containing Ba(2+) cations as guest…
The distribution function of differently branched molecules resulting from the ideal statistic condensation of AB 2 functional monomers is calculated as a function of the conversion of the A groups. For these distribution functions the averaged branching parameters DB F = (number of terminal groups + number of dendrit…
Poly(propylene fumarate- co -ethylene glycol) has been synthesized in an effort to develop a cross-linkable biomaterial for use as a vascular implant. This copolymer has been fabricated in a block configuration with two to three homopolymer units in series through a transesterification reaction between the linear poly…