Materials Literature
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The integration of metallic nanostructures with semiconductors is important for a variety of technological applications. Through an efficient galvanic displacement reaction on germanium, complex silver nanostructures form spontaneously in aqueous conditions at room temperature. The structures, termed nano-inukshuks, a…
Modification of the phosphate groups of lipid A with 4-amino-4-deoxy-L-arabinose (L-Ara4N) is required for resistance to polymyxin and cationic antimicrobial peptides in Escherichia coli and Salmonella typhimurium. We previously demonstrated that the enzyme ArnA catalyzes the NAD+-dependent oxidative decarboxylation o…
Scientific study of the effect of structural memory of nonequilibrium defective solids about the processing in magnetic field (the magnetic structural effect (MSE) was continued in this paper. The study was aimed to reveal the universal nature of the MSE, which was investigated in several new nonequilibrium defective…
The theory of charge and spin transport in forward-biased Schottky barriers reveals characteristic and experimentally relevant features. The conductance mismatch is found to enhance the current induced spin-imbalance in the semiconductor. The GaAs|MnAs interface resistance is obtained from an analysis of the magnetic…
Stable porphyrin/single-walled nanotube (SWNT) composites were synthesized by condensation of tetraformylporphyrins and diaminopyrenes on SWNTs. The degree of interaction between SWNTs and porphyrin was evaluated by UV−vis and fluorescence spectra, and chemical removal of porphyrin from SWNTs. In the composites, the S…
We consider dislocations in the framework of Eringen's nonlocal elasticity. The fundamental field equations of nonlocal elasticity are presented. Using these equations, the nonlocal force stresses of a straight screw and a straight edge dislocation are given. By the help of these nonlocal stresses, we are able to calc…
Temperature-dependent radiative recombination of free excitons involving one or two LO phonons in GaN is investigated in detail. It is found that both phonon sidebands possess asymmetric lineshape and their energy spacings from the zero phonon line strongly deviate from the characteristic energy of LO phonons as the t…
We report a photoluminescence observation of robust excitonic polarons due to strong coupling of exciton and longitudinal optical (LO) phonon as well as Fano-type interference in high quality ZnO crystal. At low enough temperatures, the strong coupling of excitons and LO phonons leads to not only traditional Stokes li…
Solid solutions of nominal composition [ZnGa 2 O 4 ] 1− x [Fe 3 O 4 ] x , of the semiconducting spinel ZnGa 2 O 4 with the ferrimagnetic spinel Fe 3 O 4 , have been prepared with x = 0.05, 0.10, and 0.15. All samples show evidence for long range magnetic ordering with ferromagnetic hysteresis at low temperatures. The…
Structural characteristics of nanosized ceria-silica, ceria-titania, and ceria-zirconia mixed oxide catalysts have been investigated using X-ray diffraction (XRD), Raman spectroscopy, BET surface area, thermogravimetry, and high-resolution transmission electron microscopy (HREM). The effect of support oxides on the cr…
Measuring, characterizing, and modelling the slow dynamics of glassy soft matter is a great challenge, with an impact that ranges from industrial applications to fundamental issues in modern statistical physics, such as the glass transition and the description of out-of-equilibrium systems. Although our understanding…
The electrochemical performance of supercapacitors made of a carbon material with a moderate amount of nitrogen atoms embedded in a carbon matrix is reported. Melamine was polymerized in the interlayer spaces of mica and afterward carbonized at various temperatures between 650 and 1000 °C. Elemental analysis and an XP…
Silver(I)-imidazole cyclophane gem-diol complex, 3 [Ag2C36 N10(O)4](2+)2(x)-, where x = OH- or CO3(2-), was synthesized and well characterized. The minimum inhibition concentration tests showed that the aqueous form of 3 is 2 times less effective as an antibiotic than 0.5% AgNO3, with about the same amount of silver.…
One of the most fundamental tasks in nanoscience is the accurate determination of particle sizes. Various methods have been developed to elucidate the mean particle diameter and the standard deviation for an ensemble of nanocrystals. However, good agreement between the results from different methods is not always enco…
Multi-walled carbon nanotubes with controllable structures are produced at a low temperature (175 °C) by using CCl4 as the precursor for pyrolytic growth in a supercritical carbon dioxide medium, in the presence of iron catalysts encapsulated in polypropyleneimine dendrimers (see picture). This work may lead to a larg…
Single crystals of the nonlinear optical (NLO) material TmAl 3 (BO 3 ) 4, space group R 32, were grown successfully by the top seeded solution growth (TSSG) method for the first time in our laboratory. Morphology analysis reveals that the crystal is a rhombohedron with nine developed faces with the major forms (12̄10)…
A hybrid rheological approach utilizing thermal analysis, microscopy, and oscillatory viscoelastic measurements is presented here for estimating the interfacial tension, γ 12, of a partially miscible polymer mixture. The mixed composition of each of the bulk phases affects its complex modulus and T g, along with γ 12…
We have investigated the influence of the steric properties of conducting particles in a nonconducting host matrix on the conductivity threshold of the material, i.e., the minimum volume fraction of conducting phase for the whole sample to become conducting. A statistical, numerical method is used in which the particl…
New aliphatic polyester-type dendrimers were synthesized using a new AB2-type building block 3, prepared from benzyl acetoacetate and 2 equiv of tert-butyl acrylate by acetoacetic acid ester synthesis. The reiterative [deprotection by HCO2H, then EDCI/DMAP coupling] sequence using divergent growth method gave [G1]-4tB…
A conventional scanning electron microscope equipped with a LaB6 source has been modified to operate in a scanning transmission mode. Two detection strategies have been considered, one based on the direct collection of transmitted electrons, the other on the collection of secondary electrons resulting from the convers…