Materials Literature
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Hysteresis measurements performed on graded Pt/lead zirconate titanate (PZT)/Pt structures with well oxygenated PZT films do not display any shift along the polarization axis (Voffset) as previously reported. On the other hand, when the PZT graded films were grown under low oxygen pressure, an offset voltage was measu…
Hydrogenated zinc oxide gives rise to complex vibrational spectra with many prominent features that remain unexplained. Our calculations have unambiguously shown that the presence of vacant oxygen and zinc interstitial surface sites is the only way to rationalize the observed spectra, notably the 1710 cm−1 zinc hydrid…
A study of reactions of dimeric siloxide iridium complex, [[(cod)Ir(mu-OSiMe3)]2] (1) with vinyltriethoxysilane and vinyltrimethoxysilane has revealed a new type of the reation--alkoxy group transfer from silicon to iridium with a simultaneous transfer of a siloxy group from iridium to silicon--as a result of which vi…
Highly oriented films of Sr2FeMoO6 were fabricated by ultrasonic spray pyrolysis. A combined organic/inorganic solution was developed and the films were deposited on single-crystal LaAlO3 between 600 °C and 900 °C followed by postannealing at 850 °C or 1200 °C in Ar/5% H2. Optimum films showed a metallic resistivity b…
A cyclic dimer of chiral saddle-shaped porphyrin with p-xylylene linkers, upon interaction with mandelic acid, showed an enhanced circular dichroism activity, which was more than 7 times as large as that of a monomeric reference.
Semiconductor quantum dots possess two important properties: Size-dependent increase in band gap (size quantization) and a very high surface-to-volume ratio. We show that cyanide adsorption on this high surface further increases the size quantization in films of CdSe and CdS quantum dots and that removal of the cyanid…
Various methods for the synthesis of quantum dots of compound semiconductors are discussed. Emphasis is placed on methods involving the decomposition of chalcogenide-containing precursors in tri-n-octylphosphine oxide. The use of simple coordination complexes can avoid the use of pyrophoric precursors. Approaches base…
Levovist contrast agent bubble dynamics after spark-induced pressure wave exposure is investigated in the vicinity of normal rat kidney fibroblast cells. The bubble dynamics is calculated using the Keller–Miksis model and results are compared with the experimental radius time curves. High-speed microscopic images show…
Unique crystal structures containing two kinds of crossed charge-transfer (CT) columns are demonstrated by cocrystals consisting of ion pairs of acceptors of methyl viologen and anthraquinone disulfonate derivatives and a donor, hydroquinone, mediated by electrostatic and donor-acceptor (DA) interactions.
The fluorescence of thiol-capped CdTe nanoparticles have been measured using nanosecond laser spectroscopy. While the bandedge fluorescence intensity of CdTe nanoparticles has been found to increase linearly with excitation intensity at low intensities, an unusual decrease of fluorescence intensity with increasing exc…
The (Ba0.5Sr0.5)TiO3 (BST) thin films were deposited on the LaNiO3/Pt(111)/Ti/SiO2/Si [LNO/Pt(111)] and LaNiO3/Pt(200)/SiO2/Si [LNO/Pt(200)] substrates by metalorganic deposition process. The BST films directly grown on the Pt(200) and Pt(111) substrates exhibited random orientation. In case of the LNO/Pt(111) substra…
Urethanes are frequently used in biomedical applications because of their excellent biocompatibility. However, their use has been limited to bioresistant polyurethanes. The aim of this study was to develop a nontoxic biodegradable polyurethane and to test its potential for tissue compatibility. A matrix was synthesize…
A lattice spin-fermion model for diluted magnetic semiconductors (DMS) is investigated numerically, improving on previously used mean-field approximations. Curie temperatures are obtained varying the Mn spin x and hole n densities, and the impurity-hole exchange J in units of the hop-ping t. Optimal values are found i…
ZnGeN2, one of the II–IV–N2 compounds, has been grown directly on r-plane sapphire by remote-plasma enhanced metalorganic vapor phase epitaxy. Single crystalline ZnGeN2 was obtained at growth temperature of 775 °C. Epitaxial relationship is ZnGeN2(010)/α-Al2O3(10–12), ZnGeN2[100] ∥α-Al2O3[11–20], and ZnGeN2[001] ∥α-Al…
Fluorescence quenching of poly(phenylene ethynylene) (PPE) particles by a Cy-5 labeled oligonucleotide is 2 orders of magnitude more sensitive than direct excitation of the Cy-5 fluorophore.
The spontaneous polarization and the piezoelectric constants of ZnO and BeO are evaluated at the ab initio level with the CRYSTAL program that uses a Gaussian-type basis set. The results obtained with four different Hamiltonians, namely, Hartree-Fock (HF), local-density approximation (LDA), Perdew-Burke-Ernzerhof, and…
Abstract Structured soft‐core/hard‐shell hydrophobic latices form rigid and transparent films under ambient conditions without the need of coalescing aids. The studied films have a composite structure, with the majority of soft poly( n ‐butyl acrylate) dispersed in a continuous poly(methyl methacrylate) (PMMA) matrix.…
We recently reported that the orientations of nematic phases of 4-cyano-4‘-pentylbiphenyl (5CB), when supported on surfaces with nanometer-scale topography and oriented carboxylic acid groups, are strongly influenced by n -H 2 N(CH 2 ) 5 CH 3 bound to these surfaces. The changes in orientation of the liquid crystals w…
Detailed kinetic Monte Carlo--molecular dynamics (KMC-MD) simulations of hyperthermal energy (10--100 eV) copper homoepitaxy reveal a reentrant layer-by-layer growth mode at low temperatures (50 K) and reasonable fluxes (1 ML/s. where ML stands for monolayer). This growth mode is the result of atoms with hyperthermal…
A first-principles-based dynamic Monte Carlo simulation method is used to examine the effect of alloying Pd and Au on the kinetics of ethylene hydrogenation over well-defined Pd and Pd/Au surfaces. The surface reaction kinetics is a strong function of the adsorbate−metal and adsorbate−adsorbate interactions. An intrin…