Materials Literature
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A dramatic drop of ≈5 orders of magnitude in the resistance (R) of La(0.175)Pr(0.45)Ca(0.375)MnO(3) epitaxial films upon exposure to optical photons derived from both continuous and pulsed lasers, as well as broad-band sources at temperatures (T) < 30 K is reported. The strength of change is a sensitive function of bo…
Quaternary ZnMgAlO films lattice matched to a ZnO wafer were designed, grown, and characterized in detail. It was observed that the Zn 1− x − y Mg x Al y O films are lattice matched to the ZnO substrates when grown with a x / y ratio of ∼2.8, as predicted based upon the Vegard’s rule. Cathodoluminescence spectra of th…
Abstract The XeCl excimer laser (308 nm) was used for depositing p‐type SrCu 2 O 2 (SCO) films by pulsed‐laser deposition (PLD) from undoped and Ba‐doped (6%) SCO targets. The SCO films were deposited at 300 °C on glass and p‐type Si substrates, while the oxygen pressure was kept constant at 5 × 10 −2 Pa and their pro…
A novel method based on controlled etching was developed to fabricate nanopores on preformed silica nanoparticles (<100 nm in diameter). The obtained monodisperse nanoporous particles could form highly stable homogeneous colloidal solution. Fluorescent silica nanoparticles and magnetic silica-coated gamma-Fe(2)O(3) na…
We present experimental differential cross sections for the elastic scattering of electrons from CF 3 H and CF 3 I for scattering angles from 10° or 20° up to 180° at incident electron energies of 5, 10, 20, 30 and 50 eV. We also estimate integral and momentum transfer cross sections with the present measurement of di…
Colloidal gold nanoparticles prepared by employing chitosan as the stabilizer in solvent of methanol-acetic acid solution were stable for months without precipitation. The mole ratio of chitosan-gold ions of 5:1 - 30:1 gave dispersed and fine gold particles in range of 9.4-10.4 nm. Gold reduction in chitosan matrix wa…
Two new quaternary thioborate compounds with strongly one-dimensional growth, BaSb(BS(3))S and BaBi(BS(3))S, have been synthesized using the conventional solid state reaction method in closed tubes at 1100 K. The single crystal X-ray diffraction analysis has shown that compound BaSb(BS(3))S crystallizes in space group…
Diamond nanoparticle (DN)-coated CNTs were synthesized using a cationic surfactant-assisted sonochemical method. The as-prepared DN coated CNTs were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The results show that the DNs were coated…
Aging in martensite, which is accompanied by a gradual change in physical properties, has been observed in most shape-memory alloys for more than half a century. However, its microscopic mechanism has remained controversial due to a lack of experiments that can probe the atomic-level processes. By using a method which…
Nanocrystalline vanadium dioxide (VO2) thin films were prepared on glass substrates at different deposition temperatures by oxidizing sputtered vanadium films. Atomic force microscope, x-ray diffraction, and Raman scattering were employed to characterize the films. It was confirmed that low deposition temperature resu…
Abstract This paper reports an experimental study wherein flame resistance and limiting oxygen index of protective fabrics were determined before and after contamination with oil and after decontamination. Experimental variables were presence of contamination, laundry treatment, number of contamination/decontamination…
Three-dimensional binary superlattices were obtained by self-assembly of PbS nanocrystals (NCs) of size ≤4 nm, synthesized by colloidal chemistry routes and characterized by two distinct and narrow size distributions. The resulting binary superstructures have been imaged by small- and wide-angle X-ray diffraction (XRD…
The side-arms of neurofilaments (NFs) have been proposed to be highly disordered, leading to entropic repulsion that modulates interfilament spacing. To gain further insight into the dynamics and organization of the side-arms, we performed molecular dynamics simulations of neurofilament brushes using a coarse-grained…
The retention of deuterium fuel during MAST discharges has been studied using the method of global gas balance. The results show that with inter-shot 4He-GDC, the total number of particles retained for a discharge increases with the total number of injected particles, and the total retention fraction stays very high,…
This contribution reviews the mathematical concepts of micromechanical modelling in the phase-field approach applied to dislocation dynamics. The intention is two-fold. On the one hand, modelling of dislocation dynamics is a very recent field of development in phase-field theory, in comparison to the simulation of dif…
Generally production of chitosan from crustacean shells consists of 4 steps, i.e. deproteinization, demineralization, decolorization and deacetylation. Simplification of chitosan production by elimination of deproteinization and/or demineralization, or reducing of reaction time would give many advantages, e.g. reducti…
Nano- and mesofibers were prepared via electrospinning of dispersions of styrene−acrylate copolymers from an aqueous environment. The synthetic versatility of emulsion polymerization technique allowed us to incorporate cross-linking strategies to improve the thermal and mechanical stability of fibers. In general, a wa…
Nonfaceted growth of (111)-oriented epitaxial KBr crystals on sapphire single crystal substrates has been achieved using a novel vacuum deposition method of flux-mediated epitaxy, involving the use of ionic liquids as a flux. It was found that the ionic liquid could act as a flux to promote the growth of KBr at higher…
The formation energy and solubility of hydrogen in magnesium nitride bulk (antibixbyite ${\text{Mg}}_{3}{\text{N}}_{2}$) have been studied employing density functional theory in the generalized gradient approximation. The effect of doping and the presence of native defects and complex formation have been taken into ac…
The ${({\text{SrTiO}}_{3})}_{m}/{({\text{SrVO}}_{3})}_{n}$ ${d}^{0}\text{\ensuremath{-}}{d}^{1}$ multilayer system is studied with first-principles methods through the observed insulator-to-metal transition with increasing thickness of the ${\text{SrVO}}_{3}$ layer. When correlation effects with reasonable magnitude a…