Materials Literature
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Density functional theory computations were performed to investigate hydrogen adsorption in metaldecorated defective BN nanosheets. The binding energies of Ca and Sc on pristine BN nanosheets are much lower than the corresponding cohesive energies of the bulk metals; however, B vacancies in BN nanosheets enhance the b…
This study investigated the mechanical properties of vibrating cantilevered multiwall carbon nanotubes in terms of energy loss in a vibrating nanotube. Young's moduli of the nanotubes show a clear dependence of the perfection of the sp(2) carbon network, as determined from Raman spectroscopy. The energy loss correspon…
We report results from a comprehensive set of experiments to study coherently controlled electrical current injection in single-walled carbon nanotubes (SWNTs) and graphite. Photocurrents were injected at room temperature through the quantum interference of single- and two-photon absorption pathways induced by 150-fs…
Here we investigate high frequency AC transport through narrow graphene nanoribbons with top-gate potentials that form a localized quantum dot. We show that as a consequence of the finite dwell time of an electron inside the quantum dot (QD), the QD behaves like a classical inductor at sufficiently high frequencies ω…
We studied hydrogen-bonding assemblies in a series of dumbbell-shaped hydrazine derivatives, namely oxalyl N',N'-bis(3,4-dialkoxybenzoyl)-hydrazide (BFH-n, n = 4, 6, 8, 10) and oxalyl N',N'-dibenzoyl-hydrazide (FH-0). It has been demonstrated that NH-1 protons of BFH-n precipitated from tetrahydrofuran (THF) or dimeth…
The gaseous pollutant, nitric oxide, is produced in almost every combustor but can be converted back to molecular N 2 by reacting it with metallic iron in (I) In fuel-rich regions of a combustor, the product, iron oxide, can be chemically reduced to metallic Fe (for subsequent reuse) by, e.g., carbon monoxide in (II)…
Advanced materials are recently gaining importance as replacements for conventional materials and as facilitators of new and distinctive products. These materials have had a considerable impact on the development of a wide range of strategic technologies and offer greater potential for rapid technological advance and…
Abstract Glass formation region in the V 2 O 5 ‐MoO 3 ‐ZnO system was determined using low cooling rates (10 2 K/s). The glasses were obtained in the central part of the system from compositions containing 10‐65 mol% V 2 O 5 , 10‐65 mol% MoO 3 and 10‐50 mol% ZnO. The amorphous and crystalline phases were characterized…
Abstract A straightforward method, which is termed novel handspinning , is reported for producing uniaxially aligned sPP nanofibers. As demonstrated by SEM analysis, the morphologies of handspun sPP nanofibers are strongly dependent upon the processing conditions such as spinning method and solvent system. Compared to…
Dielectric relaxation caused by the segmental motion of poly(vinylpyrrolidone) (PVP) was studied in chloroform solutions with 5−40 wt % PVP at temperatures between 298 and 210 K above the melting temperature of chloroform (210 K) to obtain information on the dynamics of hydrophilic polymer. The asymmetric broadening o…
In this paper we have investigated the role of the Er-O interaction on the photoluminescence properties of Er-doped crystalline silicon. We demonstrate that the strong Er-O interaction leads to an O redistribution after thermal treatment. In particular, in the absence of Er, O out-diffuses from the Si surface and a de…
Abstract Glasses doped with rare earth (RE) ions are widely studied due to the numerous applications of these systems (active media for solid state lasers, optical telecommunication, non‐linear optical materials, electro‐optic devices, etc.). Boron trioxide, B 2 O 3 , is a known glass forming oxide with a relative low…
The storage of hydrogen in the condensed state in high-pressure vessels is dangerous, and it is impossible to store a large amount of hydrogen using adsorbents in normal ambient conditions. In order to overcome these problems, we designed a nanocapsule and investigated it with the help of the molecular dynamics simula…
The morphological, electric, and dielectric properties of water-based conjugated polymer blends, such as polypyrrole:polystyrene sulfonate (PPy:PSS) or poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), are known to be influenced by the water content. These properties also influence the macroscopic pe…
Evolution of the chemical surroundings of vacancy complexes in Sb-doped ($[\text{Sb}]=2\ifmmode\times\else\texttimes\fi{}{10}^{18}$ and $2\ifmmode\times\else\texttimes\fi{}{10}^{19}$ cm${}^{\ensuremath{-}3}$) Si${}_{0.8}$Ge${}_{0.2}$ was studied with positron annihilation spectroscopy in Doppler broadening mode. The s…
Bismuth telluride thin films with layered nanostructure have been fabricated by radio frequency (RF) mag- netron sputtering. Thin films were deposited at various substrate temperatures and durations with a single Bi2Te3 target. The microstructures and chemical compositions of these films were characterized by X-ray di…
Amphiphilic block copolymers can self-assemble into micelles in water and can further form thermosensitive gels. Here, we explored Pluronic F127 ABA triblock copolymer of poly(ethylene glycol) (PEG; A) and poly(propylene glycol) (PPG; B), modified with telechelic ionic peptides, either anionic Gly-Phe-Gly-Asp (GFGD) o…
We synthesized three novel highly fluorescent compounds, 2-(2’-pyridyl)-3-(N-ethyl-(3’-carbazolyl))acrylonitrile, 2-(3”-pyridyl)-3-(N-ethyl-(3’-carbazolyl))acrylonitrile, and 2-(4-pyridyl)-3-(N-ethyl-(3’-carbazolyl))acrylonitrile by Knoevenagel condensation. The first two were synthesized without solvent in the presen…
A solid−solid crystalline transition from β to α forms in syndiotactic polystyrene (sPS) was found during the mechanical deformation in the temperature range of 130−218 °C, studied by X-ray and infrared spectroscopy. α and β forms, in contrast to the other two crystalline structures (γ and δ forms) in sPS, are two maj…
We report the novel assembly method of CdSe quantum dot (QD)/pyridine/multi-walled carbon nanotube (CdSe-py-MWNT) hybrid material between electrodes using two-step dielectrophoresis (DEP). At the first step, we assembled the individual MWNT between electrodes by the DEP method. At the second step, the CdSe-py material…