Materials Literature
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We have investigated the spin-dependent transport properties of GaMnAs-based three-terminal semiconductor spin hot-carrier transistor (SSHCT) structures. The emitter-base bias voltage VEB dependence of the collector current IC, emitter current IE, and base current IB shows that the current transfer ratio alpha (= IC /…
A conception of inhomogeneous locally random distribution of microdefects in crystalline solids is proposed. A method to calculate some physical properties of solids, containing inhomogeneously distributed defects, is developed. A contribution of this inhomogeneity to a series of physical properties is calculated and…
In order to increase antibacterial abilities and avoid aggregation of Ag nanoparticles, Ag−SiO 2 nanocomposites were studied to achieve hybrid structure. SiO 2 nanoparticles synthesized by the Stöber method served as seeds for immobilization of Ag. The chemical binding structure and morphology of Ag−SiO 2 nanocomposit…
Coupled quantum mechanical/molecular mechanical (QM/MM) calculations were used to study the effects of large defects and cracks on the mechanical properties of carbon nanotubes and graphene sheets. The semi-empirical method PM3 was used to treat the QM subdomains and a Tersoff-Brenner potential was used for the molecu…
The effect of hydrogen bonding on the phase behavior of a chemically similar polyurethane and polyurea and their blends with poly(ethylene glycol) is examined. The polyurethane and polyurea were synthesized from the same diisocyanate, 1,5-diisocyanato-2-methylpentane, using an aromatic diol and aromatic diamine, respe…
We report energy-transferring organically modified silica nanoparticles for two-photon photodynamic therapy. These nanoparticles co-encapsulate two-photon fluorescent dye nanoaggregates as an energy up-converting donor and a photosensitizing PDT drug as an acceptor. They combine two features: (i) aggregation-enhanced…
The Vickers indentation fracture toughness test, or VIF, is addressed by considering its origins and the numerous equations that have been applied along with the technique to estimate the fracture resistance, or the K I c of ceramics. Initiation and propagation of cracks during the VIF test are described and contraste…
The surface plasmon response of metal nanoparticles is studied for different shapes and physical environments. For polyhedral nanoparticles, the surface plasmon resonances are studied as a function of the number of faces and vertices. The modification of these surface plasmons by different surrounding media and the pr…
In this paper we present the fluorescence decay profiles of vanadium and titanium doped gallium lanthanum sulphide (GLS) glass at various doping concentrations between 0.01 and 1% (molar). We demonstrate that below a critical doping concentration the fluorescence decay profile can be fitted with the stretched exponent…
Highly luminescent nanoparticles, such as, trivalent erbium-doped yttrium-oxide, Er<sup>3+</sup>:Y<sub>2</sub>O<sub>3</sub>, are expected to have a wide range of applications, including imaging, range finding, flash lidar, and other remote-sensing possibilities as well as medical applications. These particles are synt…
A study was initiated to understand requirements to widen and flatten the gain coefficient spectra of tellurite-based glasses for their application as new gain media for photonic devices. Rationale of broadening was found to be generating Raman active structural elements such as WO<sub>4</sub>, MoO<sub>4</sub> and PO<…
Hydrolyzed silane primer solutions were made of an organosilane in glycolether diluted with a large amount of water with or without an acid as a catalyst. The newly developed primer compositions exhibited an extended shelf life of 3 months or more. The compositions were specially designed to accommodate ProTEK<sup>TM<…
Fluorescence techniques are known for their high sensitivity and are widely used as analytical tools and detection methods for product and process control, material sciences, environmental and bio-technical analysis, molecular genetics, cell biology, medical diagnostics and drug screening. According to DIN/ISO 17025 c…
Optical elements with subwavelength structures (SWSs) may function as anti-reflection layers, wave plates, or polarizers. In this study, the authors focus on a pair of two-beam interference lithography systems for fabricating SWS optical elements. These systems have different optical configurations for forming the int…
The present paper reports a computational investigation of the geometry and electronic structure as well as the migration of a hydrogen impurity in the cubic SrTiO 3 crystal. The study is done using an approach based on the Hartree–Fock theory and developed for periodic systems. It is found that the H impurity forms t…
Abstract A new ammonium vanadium tellurate, (NH 4 ) 4 {(VO 2 ) 2 [Te 2 O 8 (OH) 2 ]}·2H 2 O ( 1 ) was hydrothermally synthesized and characterized by elemental analyses, IR spectrum, TG analysis, and single crystal X–ray diffraction. Compound 1 crystallizes in the monoclinic system, space group P2 1 /n, a = 7.3843(15)…
The crystal structures of erythromycin solvates were investigated by XRPD. Dihydrate is orthorhombic, P 2 1 2 1 2 1 space group, and acetone solvate is monoclinic, P 2 space group. The thermodynamic stability of two solvates in acetone aqueous solution from 35 to 50 °C were studied, indicating an enantiotropic system…
A new generation of borane−THF solutions stabilized with 0.005 M of 1,2,2,6,6-pentamethylpiperidine or N -isopropyl- N -methyl- tert -butylamine have been developed. These BTHF solutions show superior stability and reactivity at ambient temperatures when compared to BTHF complex unstabilized or stabilized with 0.005 M…
The evaluation of phthalocyanine labels for the surface-enhanced resonance Raman scattering (SERRS) detection of oligonucleotides is reported. Three phthalocyanine-labelled oligonucleotides were assessed, each containing a different metal centre. Detection limits for each labelled oligonucleotide were determined using…
Abstract Crystallization of copper(I) cyanide from piperidine (‘pip’) solution yields an adduct of CuCN : pip (3 : 4) ratio, as established by a single crystal X‐ray structure determination, which also shows the complex to have a single‐stranded ···Cu(CN)Cu(CN)···spine (C,N scrambled), one‐third of the copper atoms ca…