Materials Literature
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By considering a metal/polymer/metal structure within a tight-binding one-dimensional model, we have investigated the polaron formation in the presence of an electric field. When a sufficient voltage bias is applied to one of the metal electrodes, an electron is injected into the polymer chain, then a self-trapped pol…
Holographic reflection gratings in polymer-dispersed liquid crystals (H-PDLCs) were formed by thiol−ene photopolymerization. Using UV laser light and a single prism, electrically switchable reflection gratings in blue, green, yellow, and red colors were fabricated. Results indicate that thiol−ene polymers function as…
Skyrmions in thin metallic ferromagnetic films are stable due to competition between the RKKY interaction and uniaxial magnetic anisotropy. We mimic the RKKY interaction by the next-nearest-neighbors ferromagnetic and antiferromagnetic exchange interactions. We demonstrate analytically and numerically dissipative tran…
It is known that the orientations assumed by thermotropic liquid crystals (LCs) in contact with water are sensitive to the types and concentrations of surfactants and/or polymers present in the aqueous phase. This work expands upon these past observations by developing criteria for surfactants that give rise to a part…
The structural, magnetic, and transport properties of a mono-layered manganite <TEX>$La_{0.7}Sr_{1.3}MnO_{4+{\delta}}$</TEX> were investigated using variable temperature neutron powder diffraction as well as magnetization and transport measurements. The compound adopts the tetragonal I4/mmm symmetry and exhibits no ma…
The binding behavior between a rigid, π-accepting aromatic polycycle (ADIQ·2PF 6 ) and an electron-donating crown ether (CE(10)) is reported in acetonitrile solution. In CH 3 CN at low concentration of crown ether, the binding data are consistent with formation of a 1:1 complex in which the ADIQ·2PF 6 residue is parti…
This work deals with understanding the structural evolution of the dehydration of the 10 Å unstable hydrate of kaolinite. The method used to characterize this hydrate is based on a comparison between the experimental and the calculated X-ray diffraction profiles. The study was achieved in two steps: (i) the quantitati…
Numerical analysis of laser chemical vapor deposition (LCVD) of titanium nitride by a moving laser beam is presented. The effect of natural convection due to temperature and concentration differences in the gaseous mixture is modeled and implemented into thermal model of LCVD by a moving laser beam. The problem is for…
We present a model calculation of the paramagnetic-resonance linewidth in La 0.95 Sr 0.05 MnO 3 . Both the temperature and the angular dependencies can be described by contributions from the crystal field due to the cooperative Jahn–Teller transition.
Abstract Because poly( L ‐lactic acid) (PLLA) is a biodegradable polyester with low immunogenicity and good biocompatibility, it is used as a biomaterial. However, hydrophobic PLLA does not have any reactive groups. Thus, its application is limited. To increase the hydrophilicity of PLLA and accelerate its degradation…
Thermodynamically stable clusters containing up to 10 or more silver iodide pairs have been observed in aqueous electrolyte solutions using ultracentrifugation and cryoelectron microscopy. These clusters are in equilibrium with an excess phase of solid AgI. We measured the size distribution of the clusters by their si…
Polycrystalline samples of SrBi 2 Ta 2 O 9 (acronym SBT) have been prepared by means of solid-state reaction either using a classical route or by mechanochemical activation. For each compound, a structural analysis of the ferroelectric orthorhombic phase (space group A 2 1 am ) has been performed from the fitting of n…
We extend the Mayadas and Shatkes's approach [Phys. Rev. B $1,$ 1382 (1970)] to study the optical properties of polycrystalline metal thick films in the visible and far infrared range of the spectrum. We show that in this range grain boundary scattering can account for the experimentally observed lowering of the film…
In connection with the recent experiments on photoenhancements of the electronic conductivity and the quasistatic electric susceptibility of ${\mathrm{SrTiO}}_{3},$ we theoretically study global versus local parity violation of a photogenerated electron in this dielectric. The photogenerated electron, being quite itin…
This work presents a simple and versatile approach for the growth of in-situ contacted single-walled carbon nanotubes (SWCNTs) and subsequent improvement of the contacts using a self-aligned process. We investigated the conditions for the thermal CVD growth of SWCNTs and developed a variety of multilayered metal syste…
K2Al2B2O7 has been found to be phase matchable for type-1 sum-frequency generation (SFG) at 0.193 microm by mixing the Nd:YAG laser wavelength at 1.0642 microm and the SFG output of the RbTiOAsO4 optical parametric oscillator tuned at 0.2358 microm. An average power of 200 mW at 10 kHz was obtained in a 7-mm-long crys…
Using 2D-LC, a mother PS-b-PI diblock copolymer prepared by anionic polymerization was fractionated into nine fractions differing in the PI and PS block lengths. In this way, PS-b-PIs of the similar molecular weight were obtained. The fractions show composition variation large enough to construct a detailed phase diag…
We describe a model for non-convecting diffusion-controlled solidification of a ternary (three-component) alloy cooled from below at a planar boundary. The modelling extends previous theory for binary alloy solidification by including a conservation equation for the additional solute componentand coupling the conserva…
PTFE latexes with particles in the submicrometer size range were employed as seeds in the emulsifier-free styrene emulsion polymerization to obtain PTFE−polystyrene (PS) core−shell nanospheres. Stable latexes were generally obtained. Neither residual PTFE nor secondary nucleation was observed, thus leading to PTFE−PS…
Group-theoretical methods are widely used in the investigation of phase transitions in crystals. On the one hand, important structural aspects concerning the relation between the lowand the highsymmetry structures follows from the the group±subgroup relations of the space groups G > H describing the symmetry of the tw…