Materials Literature
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We present our results of an accurate and detailed study of the structural and transport properties of the recently proposed Haeckelite carbon nanotubes (HCNs) using the generalized tight-binding molecular dynamics scheme. The quantum conductance and the current vs voltage $(I\text{\ensuremath{-}}V)$ curves for the HC…
In this work, a model is proposed for the estimation of the adsorption parameters from TPD thermograms when the adsorption cell can be modeled as a well-mixed reactor, evaluating the adsorption and desorption rate constants from statistical thermodynamics. The estimation procedure consists of fitting the model to the…
Abstract The synthesis of (per)fluoropolyether phosphate esters prepared by the reaction of phosphorus pentoxide and fluorinated alcohols has been investigated. The reactivity strongly depends on the structure of the fluorinated alcohol, generally decreasing with increasing acidity. Moreover, the addition of a modulat…
An alumina–5 vol% yttrium aluminum garnet (YAG) composite was obtained through in situ reaction of alumina and yttria during sintering. Analysis of creep experiments together with microstructural data indicated that both pure alumina and alumina–5 vol% YAG composite deform by a Coble grain boundary diffusion creep pro…
Self-intermediate scattering functions (ISFs) are measured by dynamic light scattering for the colloidal fluid of hard spheres for both equilibrium and nonequilibrium (undercooled) conditions, i.e., for volume fractions below and above the known freezing transition of the hard-sphere system. The delay time tau(m) wher…
At room temperature, without any template and in the solid phase, shape-controlled silver nanostructures are synthesized using solid electrolyte RbAg(4)I(5) thin film under direct current electric field (DCEF) treatment. With different DCEF strengths, we have synthesized silver single-crystalline nanowires, nanotubes,…
Electronic properties of straight carbon nanotubes under an external electric are investigated, following a single-π-orbital tight binding approximation. Metal-insulator transitions in metallic tubes and energy gap modulations in semiconducting ones were found due to the action of the electric field. Reductions in the…
Abstract Thermal stability, crystallization, morphological development, subsequently melting, and crystallinity control of a syndiotactic 1,2‐polybutadiene sample were carefully carried out by thermogravimetry (TGA), polarized optical microscopy (POM), differential scanning calorimetry (DSC), temperature‐modulated dif…
We have reported the dc conductivity as well as the ac conductivity in the frequency range 10 Hz–2 MHz for x AgI–(1− x )(0.5Ag 2 O–0.5MoO 3 ), glass-nanocomposites in the temperature range 100–303 K. We have compared the conductivity and its activation energy for the molybdate nanocomposites with those of the borate a…
We synthesized CdS nanorods through a conventional solvothermal method and studied their photoluminescence and electric transport properties before and after annealing. High-resolution transmission electron microscopy indicated that the surface layer of the annealed CdS nanorods was well crystallized, while that of th…
Isothermal magnetization curves up to 23 T were measured in Gd 5 (Si x Ge 1− x ) 4 alloys for x ⩽ 0.1. We show that a field-induced transition occurs from the antiferromagnetic (AFM) phase to a state in which competing short-range AFM and ferromagnetic (FM) correlations are present. This is based on the abrupt change…
We present optical reflectivity of single crystals of ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{K}}_{x}\mathrm{Bi}{\mathrm{O}}_{3}$ in the semiconducting range from $20\phantom{\rule{0.3em}{0ex}}\mathrm{K}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}400\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in the in…
The electromechanical behavior of an ionic polymer?metal composite (IPMC) based on a chitosan/polyaniline (CP) interpenetrating polymer network (IPN) is influenced by the internal structure of the CP ion exchange membrane. The freeze-drying method was found to be successful in improving the IPMC electromechanical prop…
The strength of molecular orientational correlations in polar liquids is assessed by means of comparison of the diffuse scattering patterns of a liquid composed by molecules devoid of permanent electric dipole but having a weak quadrupole moment and those for a liquid composed by permanent molecular dipoles. The exten…
Multivalent polymers, i.e., copolymers with multiple binding sites, have been proposed recently for stabilization of fusogentic liposomes and other liposomal colloids useful for drug delivery. The performance of such polymers critically depends on their molecular architecture, in particular the strength and frequency…
The specific heat of single-crystal PrMnO 3 was investigated from 2 to 200 K under different magnetic fields up to 8 T. A Schottky-like anomaly observed at low temperature was gradually shifted to higher temperatures by magnetic fields. The first four singlets of the Pr 3+ 3 H 4 ground multiplet in PrMnO 3 are given f…
This paper presents a combined experimental Raman and density functional theory (DFT) study of a series of oligothiophenes with variable pi-core lengths and substituted at the alpha,omega- and beta,beta'-terminal positions with perfluorohexyl, perfluorohexylcarbonyl, perfluoroarene, and cyano groups. The study covers…
In this letter, we report on a method of decreasing the injection barrier from metal electrodes to organic semiconductors, namely pentacene and poly(triarylamine) (PTAA). This method involves the electrodeposition of PEDOT∕PSS on to the source electrode of an organic field-effect transistor (OFET) without unintended d…
Reported in this paper is the preparation of ε-Co nanocrystals coated by a monolayer of poly(acrylic acid)- block -polystyrene or PAA−PS. This method is adopted from one using oleic acid as the surfactant. The replacement of oleic acid by PAA−PS as the surfactant during Co nanoparticle preparation yields Co/PAA−PS par…
An anomalous aggregation of hairy-rod segments generating nanoscale disklike domains is found to occur in the solution of the semirigid polymer at concentrations well below the threshold lyotropic concentration. These aggregate domains are micellelike in the sense that they exist in equilibrium with a dilute isotropic…