Materials Literature
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Polarized photoluminescence spectra of the nonpolar ZnO single crystals annealed at different temperatures in air were investigated, for which the whole emission spectra from visible up to ultraviolet range for zinc and oxygen defects states are taken separately via the parallel and the crossed polarization geometries…
We investigate the fine structure of band-edge excitons in PbSe nanocrystals and nanorods using circularly polarized magnetophotoluminescence and optically detected magnetic resonance and, based on the results, propose a singlet-triplet model of exciton photoluminescence from nondegenerate conduction and valence bands…
The role of surface atoms on the emission from core−shell nanocrystals depends on whether the surface atom is anionic or cationic. A cation-rich surface enhances the emission intensity, while an anion-rich surface leads to deterioration of the fluorescence signal. However, the correspondence of surface coverage to emi…
Wetting of water, a 1 : 1 water/ethanol mixture and an aqueous dodecylbenzene sulfonic acid surfactant solution on hydrophobic and superhydrophobic surfaces were studied using confocal Raman microscopy. The superhydrophobic surfaces were prepared by immersion of a glass substrate in a silica particle/fluoropolymer for…
Raman scattering measurements on multiferroic Pb(Fe(1/2)Nb(1/2))O₃ over a wide temperature range from 10 to 500 K were performed. Very broad and overlapping peaks (first-order character) and a prominent high-frequency peak at approximately 1130 cm( - 1), which we assign as a two-phonon peak, were observed. These featu…
Gold nanoparticles are ideal candidates for clinical applications if their plasmon absorption band is situated in the near infrared region (NIR) of the electromagnetic spectrum. Various parameters, including the nanoparticle shape, strongly influence the position of this absorption band. The aim of this study is to pr…
Ultrathin MnOOH nanofibers were synthesized on a large scale from diluted Mn(NO(3))(2) aqueous solution at room temperature. These MnOOH nanofibers were shape-reservedly converted into Mn(3)O(4) and MnO(2) nanofibers by post-heat treatment in air at 400 °C and 600 °C for 1 h, respectively. The morphology and crystalli…
We have investigated magnetic properties of single-crystalline full-Heusler alloy Co2Fe1−xMnxAl films (0<x<1) grown on GaAs (001) by molecular-beam epitaxy at different temperatures. It is found that as x increases, the films grown at 160 °C have complex magnetic phases, but show pure ferromagnetic prope…
Large-area ordered arrays can be created by the self-assembly of linear defects in thin smectic-A films deposited in air on crystalline substrates. Such structures could find applications in nanoparticle assembly and soft lithography. The smectic layers are bent in concentric cylinders under the effect of conflicting…
Bisphthalocyaninato terbium complexes show a long magnetization relaxation time at relatively high temperatures---which makes them very interesting as magnets at single-molecule level. Their technological exploitation, however, requires the addressing of the individual molecules, therefore the deposition of single-mol…
Novel polymer nanowires with triple hydrogen-bonding sites have been prepared by a one-pot procedure based on metallogel template polymerization, which was carried out in an Ag(I)-coordinated organogel with benzoyl peroxide (BPO) as initiator. The product has been characterized using infrared spectroscopy, scanning el…
We report the results of a comprehensive study on dc magnetization, ac susceptibility, and the magnetotransport properties of the La(1 - x)Sr(x)CoO₃(0 ≤ x ≤ 0.5) system. At higher Sr doping (x ≥ 0.18), the system exhibits Brillouin-like field cooled magnetization (M(FC)). However, for x < 0.18, the system exhibits a k…
The shear-induced reorientations and phase transitions of symmetric diblock copolymer/nanorod nanocomposites subjected to steady shear flow, are systematically investigated via dissipative particle dynamics (DPD) simulation method. Both selective and nonselective nanorods (NRs) are considered, with low and high NRs co…
Thiol−ene photopolymerization was used in the synthesis of elastomeric polyanhydrides. Side reactions involving the addition of thiol to the anhydride were observed but take place at a much slower rate than photoinitiated thiol−ene polymerization. The thermomechanical properties, including the glass transition tempera…
The crystal structure of the enzyme phosphoglucomutase from Salmonella typhimurium (StPGM) is reported at 1.7 A resolution. This is the first high-resolution structural characterization of a bacterial protein from this large enzyme family, which has a central role in metabolism and is also important to bacterial virul…
We demonstrate an enhancement of optical transmission by creating randomly distributed nanoholes in a glass surface using a simple bottom-up fabrication process. V-shaped holes with sub-100 nm diameter are created by anodized aluminum oxide template and dry etching on glass substrates. The broadband and omnidirectiona…
We describe the gated bilayer graphene system when it is subjected to intense terahertz frequency electromagnetic radiation. We examine the electron band structure and density of states via exact diagonalization methods within Floquet theory. We find that dynamical states are induced which lead to modification of the…
We investigate wetting behaviors of two kinds of hydrophilic ordered nanoporous anodic alumina (PAA). The water contact angle (CA) increases at first and subsequently decreases with increasing pore diameter of PAA with closed-pore structure, while the water CA decreases monotonously on PAA with open-pore structure. Th…
Small angle X-ray scattering (SAXS) studies of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH–PPV) with varying conjugation, and polyethylene dioxythiophene complexed with polystyrene sulfonate (PEDOT–PSS) in different solvents have shown the importance of the role of π-electron conjugation and solv…
Lithium borohydride, LiBH 4, possesses high hydrogen capacity, but cannot be used for hydrogen storage owing to the problematic H-exchange kinetics and thermodynamics. In the present study, we employed the Li + −Ca 2+ combination strategy to improve the de/rehydrogenation properties of LiBH 4 . Our study found that me…