Materials Literature
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Abstract Mechanical blends of ethylene–vinyl acetate copolymer and polyaniline doped with dodecyl benzene sulfonic acid (PAni–DBSA) were prepared in a two‐roll mill at 50°C and in a Haake internal mixer at 150°C. The effects of the blend composition and processing conditions on the electrical conductivity and mechanic…
Abstract The effect of diluents on isotactic polypropylene (iPP) membrane formation via thermally induced phase separation was investigated. The diluents were methyl salicylate (MS), diphenyl ether (DPE), and diphenylmethane (DPM). The cloud‐point curve was shifted to a lower temperature in the order iPP–MS, iPP–DPE,…
Abstract A new technology to synthesize trans ‐1,4‐polyisoprene (TPI) with bulk precipitation polymerization in the presence of a supported Ti catalysts was introduced. The termination of polymerization, stabilization of the polymer, and the adjustment of the molecular weight of TPI and its quality index are discussed…
We report new types of heterogeneous hydrogen-oxygen and silicon-oxygen branched chain reactions which have been found to proceed explosively after the filling of pores of hydrogen-terminated porous silicon (Si) by condensed or liquid oxygen in the temperature range of 4.2-90 K. Infrared vibrational absorption spectro…
The use of continuum phase-field models to describe the motion of well-defined interfaces is discussed for a class of phenomena that includes order-disorder transitions, spinodal decomposition and Ostwald ripening, dendritic growth, and the solidification of eutectic alloys. The projection operator method is used to e…
Quantum conductivity of single-wall carbon nanotube Y-junctions is calculated. The current versus voltage characteristics of these junctions show asymmetry and rectification, in agreement with recent experimental results. Furthermore, rectification is found to be independent of the angle between the branches of these…
We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor lambda-(BETS)2FeCl4. Below 4 K, antiferromagnetic-insulator, metallic, and eventually superconducting (FISC) ground states are observed with increasing in-plane magnetic field. The FISC state survives between…
We derive an analytic expression for the average difference between the forces on the ions in a Car-Parrinello simulation and the forces obtained at the same ionic positions when the electrons are at their ground state. We show that for common values of the fictitious electron mass, a systematic bias may affect the Ca…
Properties of $\mathrm{Pb}({\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}){\mathrm{O}}_{3}$ (PZT) for compositions x near the morphotropic phase boundary and under an electric field are simulated using an ab initio based approach. Applying an electric field of [111] orientation to tetragonal PZT (e.g., $x=0.50)$ le…
We have investigated the electronic structure of ordered and disordered ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ using ab initio band-structure methods. The effect of disorder was simulated within supercell calculations to realize several configurations with mis-site disorders. It is found that such disorder effects de…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFacile Synthesis of Well-Defined, Biocompatible Phosphorylcholine-Based Methacrylate Copolymers via Atom Transfer Radical Polymerization at 20 °CEmma J. Lobb, Iris Ma, Norman C. Billingham, Steven P. Armes, and Andrew L. LewisView Author Information School of Chemistry…
Abstract Dendrimer chemistry is one of the most fascinating and rapidly expanding areas of modern chemistry. This review attempts to uncover the appeal of these structurally‐perfect branched macromolecules. The three intriguing regions of a dendritic molecule are discussed: the multifunctional surface, the tailored sa…
One of the motivating questions in materials research today is, how can elements be combined to produce a solid with specified properties? This book is intended to acquaint the reader with established principles of crystallography and cohesive forces that are needed to address the fundamental relationship between the…
Ekatite, ideally (Fe 3+ , Fe 2+ , Zn) 12 (OH) 6 [AsO 3 ] 6 [AsO 3 HOSiO 3 ] 2 , is a new mineral from Tsumeb, Namibia. It is associated with chalcocite and occurs as small sprays of fine needles, up to 2 mm long and less than 0.2 mm in diameter. Ekatite is brownish black, translucent with a brown streak and vitreous l…
Phase separation in blends of bisphenol A polycarbonate and poly(methyl methacrylate), PC/PMMA, is investigated on the microscopic scale by means of atomic force microscopy (AFM). This technique allows the visualization of the early stages of phase separation with greater accuracy, relative to optical techniques. In c…
We show the existence of fragile-to-strong transitions in kinetically constrained systems by studying the equilibrium and out-of-equilibrium dynamics of a generic constrained Ising spin chain that interpolates between the symmetric and fully asymmetric cases. We find that for large but finite asymmetry the model displ…
We compute the tunneling density of states of doped multiwall nanotubes including disorder and electron-electron interactions. A nonconventional Coulomb blockade reflecting nonperturbative Altshuler-Aronov-Lee power-law zero-bias anomalies is found, in accordance with recent experimental results. The presence of a bou…
Abstract The novel polymer modification method based on the activation of an aliphatic polyester chain by using lithium diisopropylamide at low temperature to form a polycarbanion bearing nucleophilic sites in a position α to the carbonyl groups was applied to rac ‐poly (lactic acid), PLA 50 , to label this polymer wi…
Electrochemical and spectroelectrochemical studies were conducted on thin films of poly- tris(4-vinyl-4‘-methyl-2,2‘-bipyridine)ruthenium(II) which were formed by electrochemical reductive-polymerization. These homopolymer films undergo a process whereby redox charge is trapped in the film when the potential is scanne…
The crystal structure of pillaite, a recently described Pb-Sb oxy-chloro-sulfosalt from the Buca della Vena mine, Tuscany (Italy), was solved and refined to a residual R of 0.045 in the monoclinic system, with space group C2/m, and a = 49.49(1), b = 4.1259(8), c = 21.828(4) A, β = 99.62(3) 0 , V = 4394(2) A3. The stru…