Materials Literature
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We investigate the electron transport in multiply connected metallic carbon nanotubes within the Landauer-B\"uttiker formalism. Quasibound states coupled to the incident ${\ensuremath{\pi}}^{*}$ states give rise to energy levels of different widths depending on the coupling strength. In particular, donorlike states or…
This paper concerns the development of an innovative LiCrO 2 catalyst (synthesis, characterization, mechanistic analysis, and aging). This catalyst already showed appreciable activity at 300 °C toward the catalytic combustion of soot even under loose contact conditions. Furthermore, its limited sensitivity to hydrothe…
Ceria (CeO 2 )‐doped alumina (Al 2 O 3 ) composite nano‐particles were synthesized using sucrose as a chelating agent and template material. As‐synthesized powders were characterized using X‐ray diffraction technique for their phase analysis, BET surface area analyzer for specific average surface area, and transmissio…
Abstract A new class of blend membranes from blends of nitrile rubber (NBR) and epoxidized natural rubber (ENR) has been prepared and their morphology, miscibility, mechanical, and viscoelastic properties have been studied. The ebonite method was used to study the blend morphology of the membranes. The morphology of t…
Since the 1980s hundreds of macromolecular crystal growth experiments have been performed in the reduced acceleration environment of an orbiting spacecraft. Significant enhancements in structural knowledge have resulted from X-ray diffraction of the crystals grown. Similarly, many samples have shown no improvement or…
Atomic diffusion in pure $\ensuremath{\alpha}$-Fe and Fe-l at. % Cu crystals via vacancies is investigated by molecular-dynamics computer simulation. In order to generate a large statistical set, modeling is performed for the temperature range of 1000--1800 K. The migration energy and preexponential factors in diffusi…
Three-phonon interactions are identified and analyzed in nonequilibrium molecular dynamics simulations of the Lennard-Jones face-centered cubic crystal. The small simulation cells studied and the classical nature of the simulations lead to a different description of the phonon transport than the quantum-particle model…
The phase transformation of mechanically milled nano‐sized γ‐alumina particles was investigated. The structures and phase presentation of the powders before and after milling were characterized using X‐ray diffraction, transmission electron microscopy, and photoluminescence measurement. The phase transformation kineti…
Of the proteins encoded by the three structural genes of the lac operon, the galactoside acetyltransferase (thiogalactoside transacetylase, LacA, GAT) encoded by lacA is the only protein whose biological role remains in doubt. Here, we briefly note the classical literature that led to the identification and initial ch…
The Q factors of different elemental structures of metamaterials are investigated. Electromagnetic simulation and experiments have been used and the results from both studies exhibit good agreement. The origin and role of radiation losses is discussed and the effect on the resulting value of Q is highlighted. Some hig…
We introduce a family of models for heat conduction with and without momentum conservation. They are analytically solvable in the high temperature limit and can also be efficiently simulated. In all cases the Fourier law is verified in one dimension.
AOT/water/decane microemulsions have been used to entrap the water-soluble 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS4). Quasi-elastic light scattering technique has confirmed the confinement of the porphyrin and its various aggregates into the inner water pool. Various species have been detected as functio…
Highly sensitive electrical response of carbon nanotubes to UV exposure and thermal treatments are examined. Low intensity UV-induced conductivity change in individual single-walled carbon nanotube transistors is found to be mainly arising from oxygen desorption at the metal contacts rather than from nanotubes or poss…
The Bi 2 O 3 –Nb 2 O 5 –NiO phase diagram at 1100°C was determined by means of solid‐state synthesis, X‐ray diffraction, and scanning electron microscopy. A ternary eutectic with a melting point below 1100°C was found to exist in the field between NiO, Bi 2 O 3 , and the end‐member of the δBi 2 O 3 –Nb 2 O 5 solid sol…
Aqueous suspensions of bundles and individual single-wall carbon nanotubes were prepared with the help of surfactants. We study the changes in the Raman spectra of the suspensions with respect to powders, and of exfoliated tubes with respect to bundles. The radial breathing modes (RBM) upshift in suspensions because o…
Abstract The kinetics of dynamic water vapor sorption and desorption on viscose, modal, cotton, wool, down, and polyester fibers and lyocell knit fabrics were investigated according to the parallel exponential kinetics (PEK) model. The total equilibrium moisture regain ( M inf(total) ) in all the materials decreased w…
The three-dimensional structures of emeraldine base polyaniline (PANI) and (polyaniline)(0.5)V(2)O(5) x 1.0 H(2)O have been determined by total X-ray scattering experiments. Atomic pair distribution functions (PDF) were measured to obtain experimental observables against which structural models were tested and refined…
The bimodal distribution of grain size is frequently observed in calcium copper titanate (CaCu 3 Ti 4 O 12 or CCTO) ceramics that exhibit high dielectric constant. In this study, we propose an analytical model composed of grains of two different sizes to estimate the dielectric behavior of CCTO based on microstructura…
We present molecular dynamics simulation results for the viscosity and mutual diffusion constant of a strongly asymmetric binary ionic mixture. We compare the results with available theoretical models previously tested for much smaller asymmetries. For the case of viscosity we propose a predictive framework based on t…
We present a first-principles study of the quasiparticle excitations spectrum of NiO. The calculations are performed using the spin-polarized $GW$ approximation in a plane-wave basis set with ab initio pseudopotentials. We find a feature in the band structure which can explain both an absorption edge of 3.1 eV in opti…