Materials Literature
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In this article, effect of temperature on elastic properties of single-walled carbon nanotubes is investigated by means of a molecular structural mechanics model in which the primary bonds between two nearest-neighboring atoms are treated as a two-node dimensional Euler—Bernoulli beam. By considering the effect of env…
This paper describes an experimental method that allows the estimation of the inhomogeneous and homogeneous linewidths of the photoluminescence band of a point defect in an amorphous solid. We performed low-temperature time-resolved luminescence measurements on two defects chosen as model systems for our analysis: ext…
A general molecular mechanics method is presented for modeling the symmetric bidentate, asymmetric bidentate, and bridging modes of metal-carboxylates with a single parameter set by using a double-minimum M-O-C angle-bending potential. The method is implemented within the Molecular Operating Environment (MOE) with par…
The non-ohmic and dielectric properties as well as the dependence on the microstructural features of CaCu 3 Ti 4 O 12 /CaTiO 3 ceramic composites obtained by conventional and microwave sintering were investigated. It was demonstrated that the non-ohmic and dielectric properties depend strongly on the sintering conditi…
The discovery of electric-field effect for conducting polymers in transistor structures aroused a number of questions about structure, mechanism of charge transport, and a role of ions in conducting polymers. We present here the model of an electrochemical transistor whose resistance is governed by the gate potential…
Hierarchically organized single-nanoparticle structures synthesized in this work consisted of a 200 nm silica core and a pH-responsive poly(2-vinylpyridine) shell decorated with 15 nm gold nanoparticles. pH changes in the range of 3-6 back and forth results in a swelling-shrinking polymer brush shell and, thus, in the…
Triethoxysilyl functionalized phenothiazinyl carbamates were synthesized and covalently grafted onto mesoporous MCM-41. XRD and N 2 adsorption measurements indicated the presence of a highly ordered two-dimensional hexagonal structure of functional materials, while the incorporation of organic compounds in the solid m…
In this paper, we elucidate the optical response resulting from the interplay of charge distribution (ionicity) and Peierls instability (dimerization) in the neutral-ionic ferroelectric phase transition of tetrathiafulvalene-chloranil, a mixed-stack quasi-one-dimensional charge-transfer crystal. We present far-infrare…
Small amphiphilic peptides are attractive building blocks to design biocompatible supramolecular structures via self-assembly, with applications in, for example, drug delivery, tissue engineering, and nanotemplating. We address the influence of systematical changes in the amino acid sequence of such peptides on the se…
Although magnetic shape memory alloys have attracted large scientific interest, miniaturization as single-crystalline thin films is still a greatly unresolved issue. In the present work we investigate the microstructure of epitaxial NiMnGa thin films which are fabricated by sputter deposition on magnesium oxide substr…
We report pressure-induced structural changes in PbSc(0.5)Ta(0.5)O3 studied by single-crystal x-ray diffraction and Raman scattering. The appearance of a soft mode, a change in the volume compressibility, broadening of the diffraction peaks, and suppression of the x-ray diffuse scattering show that a phase transition…
In this paper, we report a template-free solvothermal method for the formation of transition-metal-doped zinc oxide spheres and hollow spheres in methanol solvent. The synthesis includes hydrolysis of metal salts, spontaneous aggregation, and localized Ostwald ripening in an alcohol solvent. Electron microscopy observ…
In this study, a glucose-assisted method has been developed to prepare CoTe nanotubes using Te nanorods as the in situ templates under hydrothermal conditions. It was found that the concentration of glucose has an important influence on the morphology of the products. The average inner diameter of CoTe nanotubes can b…
BACKGROUND AND PURPOSE: The higher relaxivity of gadobenate dimeglumine compared with gadodiamide is potentially advantageous for contrast-enhanced brain MR imaging. This study intraindividually compared 0.1-mmol/kg doses of these agents for qualitative and quantitative lesion enhancement. MATERIALS AND METHODS: Adult…
Physical aging effects caused by prolonged natural storage $(\ensuremath{\sim}22\text{ }\text{years})$ in binary ${\text{As}}_{x}{\text{Se}}_{100\ensuremath{-}x}$ glasses are probed by temperature-modulated differential scanning calorimetry. It is shown that all aged samples with $x<40$ reveal nonzero out-of-phase…
Cobalt oxide (CoO) films epitaxially grown on Ir(100) in (111) orientation were investigated by means of quantitative low-energy electron diffraction and scanning tunneling microscopy. We find with high crystallographic precision that in the bulk of the films the rocksalt structure prevails while near the surface ther…
We present a simple model that demonstrates the possibility of capillary absorption of nonwetting liquid nanoparticles by carbon nanotubes (CNTs) assisted by the action of the Laplace pressure due to the droplet surface tension. We test this model with molecular dynamics simulation and find excellent agreement with th…
The deformation behavior as a function of applied strain was studied in a nanostructured Ni-Fe alloy using the in situ synchrotron diffraction technique. It was found that the plastic deformation process consists of two stages, undergoing a transition with applied strain. At low strains, the deformation is mainly acco…
A phase-field approach to the dynamics of liquid-solid interfaces that evolve due to precipitation and/or dissolution is presented. For the purpose of illustration and comparison with other methods, phase-field simulations were carried out assuming first order reaction (dissolution/precipitation) kinetics. In contrast…
${\text{SnO}}_{2}$ nanoparticles doped with Fe of different concentrations were synthesized by a chemical coprecipitation method. After calcination at $600\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$, the samples were characterized using x-ray diffraction (XRD), transmission electron microscope (TEM), and supe…