Materials Literature
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The structure and properties of gold nanoparticles make them useful for a wide array of biological application. Toxicity, however, has been observed at high concentrations using these systems. MTT, hemolysis, and bacterial viability assays were used to explore differential toxicity among the cell types used, using 2 n…
There is an increasing challenge for chemical industry and research institutions to find cost-efficient and environmentally sound methods of converting natural resources into fuels chemicals and energy. Catalysts are essential to these processes and the Catalysis Specialist Periodical Report series serves to highlight…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract For Abstract see ChemInform Abstract in Full Text.
The heat capacity of a supercooled liquid subjected to a temperature cycle through its glass transition is studied within a kinetic model. In this model, the beta process is assumed to be thermally activated and described by a two-level system. The alpha process is described as a beta relaxation mediated cooperative t…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionSolvent Resistant Photocurable "Liquid Teflon" for Microfluidic Device Fabrication [J. Am. Chem. Soc.2004, 126, 2322−2323]. Jason P. Rolland, R. Michael Van Dam, Derek A. Schorzman, Stephen R. Quake, and Joseph M. DeSimo…
We report the investigations of transport and thermoelectric measurements on the Heusler compounds Fe2V Ga1+x over the temperature range from 10 to 300?K. It is found that the electrical resistivity and Seebeck coefficient are very sensitive to the off-stoichiometry, while the thermal conductivity is relatively little…
The stability of closed shell bimetallic magic clusters MAu(4) (M=Ti and Zr) is investigated theoretically through ab initio molecular orbital calculations. Both these clusters have tetrahedral structures and are found to be associated with large values of the ionization potential, HOMO-LUMO gap as well as the binding…
The characterization of chemically modified carbon nanotubes has been achieved using 13 C nuclear magnetic resonance (NMR) spectroscopy. Amino-functionalized multiwall carbon nanotubes (MWNT−NH 2 ) were reacted with a 13 C terephthalic acid. Covalent attachment of the acid to the nanotubes is confirmed by 13 C NMR and…
The preferential adsorption of one component of a binary system at the inner surfaces of mesoporous silica glasses was studied in a wide composition range at temperatures close to liquid/liquid phase separation. Confinement effects on the adsorption were investigated by using three controlled-pore glass (CPG-10) mater…
We have investigated the transitions between disordered phases in supercooled liquid silicon using computer simulations. The thermodynamic properties were directly obtained from the free energy, which was computed using the recently proposed reversible scaling method. The calculated free energies of the crystalline an…
We generalize the self-consistent Ornstein-Zernike approximation (SCOZA) to a fluid of particles with a pair potential consisting of a hard-core repulsion and a linear combination of Sogami-Ise tails, w(r)=-epsilonsigma summation operator (nu)(K(nu)/r+L(nu)z(nu))e(-z(nu)(r-sigma)). The formulation and implementation o…
The short-range order which remains when the isotropic to smectic- A transition is perturbed by a gel of silica nanoparticles (aerosils) has been studied using high-resolution synchrotron x-ray diffraction. The gels have been created in situ in decylcyanobiphenyl, which has a strongly first-order isotropic to smectic-…
We analyze structural and conformational properties in a simulated bead-spring model of a nonentangled, supercooled polymer melt. We explore the statics of the model via various structure factors, involving not only the monomers, but also the center of mass (CM). We find that the conformation of the chains and the CM-…
The dynamics of ferroelectromagnetic (multiferroic) crystals RMn 2 O 5 (R = Eu and Gd), showing magnetic and ferroelectric phase transitions with close transition temperatures (40 and 30 K for R = Eu and Gd, respectively), was studied in the frequency and temperature ranges 20–300 GHz and 5–50 K, respectively. It was…
To study the effects of disulfide bonds on certain functional properties of films made from the wheat gluten proteins gliadin and glutenin, cysteine was used to promote the formation of interchain disulfide bridges between gliadins in 70% ethanolic solution. Disulfide-mediated polymerization of gliadins was confirmed…
Good quality CaCu 3 Ti 4 O 12 giant dielectric constant films have been prepared by metal–organic chemical vapor deposition on LaAlO 3 (001) substrates, using a multimetal molten precursor source. The growth of the oxide layer by a two‐step in‐situ process, namely deposition of an amorphous matrix and the consequent i…
Solid solutions of $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Sc}}_{2/3}{\mathrm{W}}_{1/3}){\mathrm{O}}_{3}--(x){\mathrm{PbTiO}}_{3}$ and $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Sc}}_{2/3}{\mathrm{W}}_{1/3}){\mathrm{O}}_{3}--(x){\mathrm{PbZrO}}_{3}$ (PSW-PT and PSW-PZ) show remarkably different dielectric responses. Even…
Fluorescence is reversibly photoregulated in high‐density random copolymers constructed from photochromic phenoxynaphthacenequinones and porphyrins (see Figure) using ring‐opening metathesis polymerization. Alternating irradiation of the polymers with ultraviolet and visible light toggles the photochromic components b…
Boron inserted as impurity by substitution of carbon atoms in graphite is known to modify the reactivity of the surface in interaction with hydrogen. Boron induces a better H retention capability in graphite while it makes easier the recombination into molecular hydrogen under heating in thermal-desorption experimenta…