Materials Literature
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Pressure–volume–temperature measurements in phenylphthalein-dimethylether (PDE) are reported, in combination with recently published dynamic light scattering data obtained under high pressure. We discuss the role that volume and thermal effects play in controlling the dynamics in the vicinity of the glass transition.…
We report findings related to the patterning of nanospheres, specifically, the deposition of gold nanoparticles on only one side of a silica or latex nanosphere. These findings are significant because they offer the prospect of assembling novel nanoscale architectures in solution. In support of this assertion, we desc…
The crystalline structure of nylon 12 2 has been studied by means of X-ray and electron diffraction. Two structures can be obtained, depending on the preparation conditions. Both are based on a progressive stacking of hydrogen-bonded sheets, but they differ in the chain axis shift between consecutive sheets. Packing e…
The ferroelectric domain structure of SrTi18O3 is studied via the azimuthal dependence of the second-harmonic (SH) light intensity below Tc≈25 K. Tensor analysis of the SH response reveals locally variant mixtures of eight triclinic polar domains, which transform into an orthorhombic single domain under an electric fi…
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Sb3+-doped and (Sb3+,Mn2+)-co-doped calcium hydroxyapatites were synthesized from a hydrothermal system, and the photoluminescent properties of these materials were investigated. The position of the emission peak of Sb3+ varies significantly with the amount of F− and Cl− anions and the F−/Cl− ratio in the reaction sys…
Ricochet of a tungsten heavy alloy long-rod projectile from oblique steel plates with a finite thickness was investigated numerically using a full three-dimensional explicit finite element method. Three distinctive regimes resulting from oblique impact depending on the obliquity, namely simple ricochet, critical ricoc…
The surface functionalization of electrically conductive substrates (indium−tin oxide (ITO), gold, free-standing polypyrrole film (PPY)) with a vinyl group containing viologen (vinyl benzyl viologen, VBV) has been carried out. The ITO was first silanized, while for the gold substrate, self-assembled alkanethiol monola…
We propounded and grew a new crystal material of ammonium nickel sulfate hexahydrate (ANSH) for an ultraviolet light filter. The crystal structure of ANSH was solved by x-ray diffraction method and the empirical formula of the title compound is (NH 4 ) 2 Ni(SO 4 ) 2 ⋅6H 2 O. The ANSH crystal belongs to the monoclinic…
We propose a Landau model to describe the smectic C–isotropic phase transition. A general Landau theory for the coupled orientational and translational order parameters and including the tilt angle is developed. The conditions for the smectic C–isotropic phase transition and the stability conditions of the smectic C p…
Addition of triflate salts to the emeraldine base form of polyaniline in the solid state causes a lowering of its work function but not an increase of its conductivity. It is postulated that this effect is due to the formation of localized energy states in the band gap. On the other hand, strong protonic acids such as…
Abstract A thiophene‐functionalized methacrylate monomer (3‐methylthienyl methacrylate) was synthesized via the esterification of 3‐thiophene methanol with methacryloyl chloride. The methacrylate monomer was polymerized by free‐radical polymerization in the presence of azobisisobutyronitrile as the initiator. Graft co…
The critical field of the Fréedericksz transition and switching dynamics are investigated for polymer-stabilized nematic liquid crystals as a function of polymer concentration. A simple phenomenological model is proposed to describe the observed critical field and dynamic response time behaviors as a function of conce…
Large-scale single-crystalline CdO nanowires have been successfully fabricated from the electrochemical deposition mixture film of Cd and Te at 450°C, and characterized by x-ray diffraction (XRD) powder, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). SEM and TEM images show that these n…
The influence of the Wiener index on solution properties of trifunctional hyperbranched polymers has been investigated using Brownian dynamics simulations with excluded volume and hydrodynamic interactions. A range of degrees of polymerization (N) and degrees of branching (DB) were used. For each DB and N, several mol…
The nucleation and growth rate of an amorphous mineral film at a Langmuir monolayer interface has been observed in situ with X-ray scattering techniques for the first time. We present measurements of a calcium carbonate film, nucleating at a fatty acid monolayer from a supersaturated calcium carbonate subphase contain…
We have produced nanocrystalline titanium dioxide films with different structures (anatase or rutile) by depositing mass selected clusters from the gas phase. Nanoparticles are produced by a pulsed microplasma cluster source and are selected by aerodynamic separation effects. We have characterized nanocrystalline film…
Glasses are known to possess some puzzling features among condensed matter systems, as shown by the Kauzmann paradox. We show that if the coherent interaction mechanisms of Quantum Electrodynamics are taken into account, glasses are nothing but molecular liquids in which a large fraction of the molecules enter a colle…
The electronic structure and spin asymmetry of metal phthalocyanines (Pcs) (metal = Mn, Fe, Cu, and Mg) and metal-free Pc thin films of 1-monolayer (ML) thickness on an Fe(100) substrate were investigated using spin-polarized metastable deexcitation spectroscopy (SPMDS). The surface density-of-states (SDOS) of these P…
Cd 1− x Zn x S nanoparticles with different compositions (0⩽ x ⩽1) embedded in silica matrix were prepared in thin film form by the sol–gel technique. The film texture and structural transformation with increasing x value were studied from transmission electron micrographs and electron diffraction patterns. Optical st…