Materials Literature
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The dynamics of exciton decay and spin dephasing in an ensemble of CdSe quantum dots grown in a glass matrix has been investigated by studying the polarized time-integrated four-wave mixing signal at $10\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Quantum dots of equal size, but with different growth conditions, have been…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTrilayer Crystalline Lamellar Morphology under ConfinementTsai-Ming Chung, Rong-Ming Ho, Jing-Chung Kuo, Jing-Cherng Tsai, Benjamin S. Hsiao, and Igors SicsView Author Information Department of Chemical Engineering, National Tsing H…
We present an unexpected product of the HAuCl4–Na2S reaction, gold tabular nanostructures, which have a surface plasmon resonance peak in near infrared region.
We have measured the M\"ossbauer spectra of magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4})$ under a pressure of up to $18\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ at room temperature using nonenriched high-quality samples. An analysis of the observed M\"ossbauer spectra confirms that ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$…
Liquid and supercritical carbon dioxide-in-water (C/W) and water-in-carbon dioxide (W/C) macroemulsions (Pickering emulsions) stabilized by fine particles were created in a high-pressure batch reactor. C/W macroemulsions form when hydrophilic particles, such as pulverized limestone, sand, flyash, shale, and lizardite,…
This paper presents a top-level review of global, regional and local (UK) research into dielectrics, as materials, and into related dielectric phenomena, measurements, technologies and applications. The review focuses on three questions: 'Is dielectrics research in growth or decline?', 'How is dielectrics research dif…
The relationships between the viscoelastic and structural properties of glass-forming materials with polysiloxane bonds, which serve as network formers, and phenyl groups, which act as network terminators, are examined based on shear viscoelasticity, (29)Si MAS NMR, and GPC measurements during the early stages of the…
CdO films, belonging to the transparent conducting oxide family which has great application potential in photovoltaic solar cells, were deposited onto glass substrates at a substrate temperature of 300 ± 5 °C by an ultrasonic spray pyrolysis technique. The electrical, optical, structural and surface properties of all…
IR spectroscopy in concert with DFT calculations and resonance Raman spectroelectrochemistry has been used to identify the molecular orbital nature of the singly occupied molecular orbital (SOMO) in reduced [Re(CO)(3)Cl(L)] and [Re(CO)(3)(4-Mepy)(L)](+) complexes, where L = 1,10-phenanthroline and its 4,7-diphenyl- an…
By using the Pariser-Parr-Pople (PPP) theory, the second hyperpolarizabilities (gamma) have been calculated for various pi-conjugated porphyrin arrays including "porphyrin tapes": the meso-beta doubly linked porphyrin array Dn and the meso-meso, beta-beta, beta-beta triply linked array Tn. The validity of the PPP theo…
In spite of many efforts, the magnetic ground state of $\mathrm{Ca}\mathrm{Ru}{\mathrm{O}}_{3}$ remains enigmatic to date and is still the subject of intense controversy. Among the peculiarities of this ruthenate is the puzzling fact that small levels of substitution on the magnetic ${\mathrm{Ru}}^{4+}$ sublattice by…
The International Tokamak Experimental Reactor (ITER), the first burning fusion plasma experiment based on the tokamak principle, is ready for construction. It is based on many years of fusion research resulting in a robust design in most of the areas. Present day fusion research concentrates on the remaining critical…
In order to find a methodology that is a compromise between favorable computational scaling and tolerable errors, a series of nonrelativistic approaches for the calculation of radiative phosphorescence lifetimes are benchmarked against fully relativistic four-component results. The study of the a 3A2-X 1A1 transition…
The synthesis, crystal structure, and electrical, optical, and magnetic properties of kappa-BETS2[Fe(III)(C2O4)Cl2], where BETS is bis(ethylenedithio)tetraselenafulvalene, are reported. The black plate crystals consist of parallel donor layers, two per unit cell, displaying a kappa-type packing of BETS(0.5+) within th…
Friedel-Crafts acylation of nickel meso-tetraarylporphyrins with aryl anhydrides, followed by air oxidation in the presence of pyridine, DMAP, and excess anhydride, produced corroles in 8-21% yields. Other products include a porphyrinic ketone, an additional corrole whose bridge has been retained as an acyl group atta…
Abstract Summary: In this work, a novel method using water as a pre‐dispersant of pristine sodium montmorillonite (Na + ‐MMT) and ε ‐caprolactam (CL) monomer was developed for the preparation of exfoliated monomer casting polyamide 6 (MCPA6)/MMT nanocomposites via in situ anionic ring opening polymerization. The dispe…
Generalized planar fault energy (GPFE) curves have been used to predict partial-dislocation-mediated processes in nanocrystalline materials, but their validity has not been evaluated experimentally. We report experimental observations of a large quantity of both stacking faults and twins in nc Ni deformed at relativel…
Block copolymer inverse micelles from polystyrene-block-poly-2-vinylpyridine (PS-b-P2VP) deposited as monolayer films onto surfaces show responsive behavior and are reversibly switchable between two states of different topography and surface chemistry. The as-coated films are in the form of arrays of nanoscale bumps,…
The amorphous-to-crystal transition has been studied by in-situ resistance measurements for Ge 2 Sb 2 Te 5 (GST) thin films doped with silicon (Si) or nitrogen (N). It was found that the electrical properties and thermal stability of GST films can be improved by doping small amount of Si in the GST film. In comparison…
A new class of degradable polymers is obtained from a diene monomer and molecular oxygen as the starting materials via a highly controlled radical copolymerization process. We now report the regiospecific copolymerization of a tetrasubstituted ethylene monomer with oxygen. Theoretical calculations support the highly s…