Materials Literature
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The emerging ferroelectric technology needs a reliable model for the simulation of the ferroelectric capacitors. This model would play a crucial role in designing new ferroelectric nonvolatile memories. As a main requirement, such a model must allow the calculation of the polarization variations for an arbitrary volta…
Classical molecular-dynamics simulations have been carried out to investigate densification mechanisms in silicon dioxide thin films deposited on an amorphous silica surface, according to a simplified ion-beam assisted deposition (IBAD) scenario. We compare the structures resulting from the deposition of near-thermal…
This work adresses the question of the scaling behaviour of polyelectrolytes in solution for a realistic prototype: We show results of a combined experimental (light scattering) and theoretical (computer simulations) investigation of structural properties of poly (acrylic acid) (PAA). Experimentally, we determined the…
A Comment on PRL 85, 1480 (2000) by K.R. Roos and M.C. Tringides.
It is demonstrated that the commonly applied self interaction correction (SIC) used in density functional theory does not remove all self interaction. We present as an alternative a novel method which, by construction, is totally free from self interaction. The method has the correct asymptotic 1/r dependence. We appl…
The linear and nonlinear melt state viscoelastic properties for a series of layered silicate based intercalated polymer nanocomposites are studied to elucidate the role of highly anisotropic nanometer thick layers in altering the flow properties of such hybrids. The steady shear viscosities for the nanocomposites exhi…
The crystallization behavior of Ge2Sb2Te5 thin films has been analyzed by atomic force microscopy and optical reflection measurements on various time scales in order to determine the crystallization kinetics including the crystallization mechanism, the corresponding activation barrier, and the Avrami coefficient. On t…
It is shown that during non-stationary heat flow in a metal the condition of charge neutrality inside the metal is violated by transient space charges which accompany the temperature relaxation. As expected for an effect of thermoelectricity, the magnitude of the space charges is small. It depends on a new parameter Q…
Thin (300 nm) porous silicon layers have been formed on p-doped silicon substrate to be characterized by x-ray reflectivity. The objective was to determine the layer thickness, the depth profile of the porosity and the interface roughness as functions of the anodization conditions. A very intense synchrotron beam was…
It is shown that fluorapatite needles formed in SiO 2 −Al 2 O 3 −CaO−P 2 O 5 −K 2 O−F - glasses upon heat treatment at 1200 °C undergo a time-dependent coarsening that fulfills the criteria of Ostwald ripening. Thermodynamic considerations imply that different growth mechanisms (normal and spiral growth) along differe…
Abstract The O 2 plasma treatment of self‐assembled monolayers (SAMs) of octadecyl mercaptan on gold substrates was investigated as a model for the oxidation of wool fiber surfaces. Three controlled low‐pressure gas‐plasma treatments were employed in which the active species were (i) atomic oxygen, (ii) atomic oxygen…
The development of three new self-polymerizable quinoxaline monomers was pursued in an attempt to increase the susceptibility of the monomers toward aromatic nucleophilic substitution reactions. The polymerizations were carried out in N -methyl-2-pyrrolidinone in the presence of potassium carbonate, to yield high mole…
Ternary blends based on a stoichiometric mixture of diglycidyl ether of bisphenol A (DGEBA) and 4,4‘-diaminodiphenyl sulfone (DDS), monodisperse polystyrene (PS, 8.3 × 10 4 g/mol), and monodisperse poly(methyl methacrylate) (PMMA, 8.86 × 10 4 g/mol) were polymerized at constant temperature. Blends containing a total a…
Abstract Homopoly( L ‐lactide) and homopoly( D,L ‐lactide) were almost inert for biodegradation with tricine buffer or normal enzymes such as bromelain, pronase, and cholesterol esterase but biodegradable with proteinase K. Significantly enhanced biodegradation was observed when an optically active ( R )‐ or ( S )‐3‐m…
Abstract Polyaniline (PANI) was doped with five novel dopants, 3‐pentadecylphenylphosphoric acid (PDPPA), pentadecylphenyl(bis)phosphoric acid [PDP(bis)PA], monocardanylphosphoric acid (MCPA), dicardanylphosphoric acid (DCPA), and phosphorylated cashew nut shell liquid prepolymer (PCNSL) and the doping behavior was st…
Abstract Plasma polymerization of hexamethyldisiloxane(HMDSO) in the presence of different carrier gases such as H 2 , He, N 2 , Ar, and O 2 was carried out using an inductively coupled electrodeless glow discharge. The polymerization kinetics showed that the monomer HMDSO plasma‐polymerized at different rates from lo…
Abstract Polypyrrole/crosslinked cellulose conductive composite films were prepared by vapor‐phase polymerization of pyrrole on the silicon crosslinked cellulose network using anhydrous ferric chloride as oxidant. The properties of the composite film depend on their synthetic conditions such as the amount of ferric ch…
The catalytic performance of a rhodium thin film in contact with the solid electrolyte Na-β‘ ‘ alumina can be greatly enhanced by the reversible electrochemically controlled transport of sodium from the electrolyte to the metal surface. By this means, the reduction of nitric oxide by carbon monoxide or by propene can…
Abstract To obtain long branched polybutylene succinate (PBS), modified PBSs were prepared by introducing a branching agent, trimethylol propane (TMP), to the polycondensation system of succinic acid and 1,4‐butanediol. Molecular parameters such as absolute molecular weight and root‐mean‐square (RMS) radius of the mod…
We present absolute measurements of differential elastic electron scattering cross sections from benzene (C 6 H 6 ) and hexafluorobenzene (C 6 F 6 ). The measurements have been performed in our two laboratories on different crossed-beam apparatuses for scattering angles between 10° and 130°: C 6 H 6 at the Australian…