Materials Literature
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The specific heat of single-crystal PrMnO 3 was investigated from 2 to 200 K under different magnetic fields up to 8 T. A Schottky-like anomaly observed at low temperature was gradually shifted to higher temperatures by magnetic fields. The first four singlets of the Pr 3+ 3 H 4 ground multiplet in PrMnO 3 are given f…
This paper presents a combined experimental Raman and density functional theory (DFT) study of a series of oligothiophenes with variable pi-core lengths and substituted at the alpha,omega- and beta,beta'-terminal positions with perfluorohexyl, perfluorohexylcarbonyl, perfluoroarene, and cyano groups. The study covers…
In this letter, we report on a method of decreasing the injection barrier from metal electrodes to organic semiconductors, namely pentacene and poly(triarylamine) (PTAA). This method involves the electrodeposition of PEDOT∕PSS on to the source electrode of an organic field-effect transistor (OFET) without unintended d…
Reported in this paper is the preparation of ε-Co nanocrystals coated by a monolayer of poly(acrylic acid)- block -polystyrene or PAA−PS. This method is adopted from one using oleic acid as the surfactant. The replacement of oleic acid by PAA−PS as the surfactant during Co nanoparticle preparation yields Co/PAA−PS par…
An anomalous aggregation of hairy-rod segments generating nanoscale disklike domains is found to occur in the solution of the semirigid polymer at concentrations well below the threshold lyotropic concentration. These aggregate domains are micellelike in the sense that they exist in equilibrium with a dilute isotropic…
The shock response of a Li 2 O–SiO 2 glass ceramic has been studied by the technique of plate impact. The Hugoniot in terms of impact stress and particle velocity has been measured using embedded stress gauges, showing an increasing complexity of behaviour as impact stress increases. Back surface measurements have rev…
Three-dimensional fiber networks were created from an organogel system consisting mainly of elongated fibrils by using a nonionic surfactant as an additive. The presence of the surfactant molecules manipulates the network structure by enhancing the mismatch nucleation on the growing fiber tips. Both the fiber network…
Photoluminescence intermittency, or "blinking", was observed in semiconductor InGaAs/GaAs quantum dots (QDs) inside a planar microcavity. Most of the blinking QDs were found around defect sites such as dislocation lines naturally formed in the GaAs barrier layers, and the carrier traps responsible for blinking had an…
Fabrication of C/SiC composites by using the heaterless chemical vapor infiltration (HCVI) technique, which is an improved technology based on the conventional chemical vapor infiltration, is reported for the first time in this paper. In the HCVI process, a gradient temperature field formed in the fiber preform overco…
Characteristics of electric parameters in the microarc oxidation (MAO) process of aluminium alloy at constant voltage were studied by a homemade data collecting system. The experimental results show that (1) the variations of the cathodic and anodic current amplitudes and the effective working current reflect obviousl…
PbS nanocrystals were synthesized directly in the conducting polymer, poly(3-hexylthiophene-2,5-diyl). Transmission electron microscopy shows that the PbS nanocrystals are faceted and relatively uniform in size with a mean size of 10 nm. FFT analysis of the atomic lattice planes observed in TEM and selected area elect…
Results of broadband dielectric spectroscopy (BDS) studies, for a remarkable temperature range $(130\phantom{\rule{0.3em}{0ex}}\mathrm{K})$, in supercooled rodlike liquid crystalline $n$-butylcyanobiphenyl (4CB) are shown. They are supplemented by static nonlinear dielectric effect (NDE) measurements in 4CB and 3CB ($…
Polycrystalline diamond and carbon nanotubes (CNTs) exhibit excellent vacuum field emission properties, characterized by low turn-on voltage and high current density. Their atmospheric field emission and ionization capabilities are reported in this paper. Highly graphitic polycrystalline diamond (HGPD) film was grown…
X-ray powder diffraction and transmission electron microscopy were used to investigate the formation characteristics and stability range of the tetragonal modification of a fluorite-type Bi 2 O 3 −Nb 2 O 5 solid solution. The results showed that this tetragonal, commensurately modulated phase forms through the interme…
The first-principles full-potential augmented plane wave (FLAPW) band calculations were performed for a series of ${T}_{2}{\mathrm{Zn}}_{11}$ ($T=\mathrm{Ni}$, Pd, Co, and Fe) $\ensuremath{\gamma}$ brasses to elucidate the Hume-Rothery electron concentration rule. The pseudogap is found immediately below the Fermi lev…
Two manganese complexes, (py2(NMe)2)MnIICl2 (1) and [(py2(NMe)2)MnIIIF2]+ (2), are here described with the macrocyclic ligand py2(NMe)2 (py2(NMe)2 = N,N'-dimethyl-2,11-diaza[3,3](2,6)pyridinophane). For both, the crystal structure is reported. The UV-visible spectrum of 2 exhibits a very broad near-infrared (NIR) band…
We present extensive x-ray absorption fine structure measurements on La(1-x)Ca(x)MnO(3) as a function of the B field (to 11 T) and Ca concentration, chi(21%-45%). These results reveal local structure changes (associated with polaron formation) that depend only on the magnetization for a given sample, irrespective of w…
We report on the absolute scale measurement of the x-ray diffuse scattering in the ZnMgSc icosahedral quasicrystal and its periodic approximant. Whereas the diffuse scattering in the approximant is purely accounted for by thermal diffuse scattering, an additional signal is observed in the quasicrystal. It is related t…
The dispersion characteristics of organoclay in nanocomposites based on end-functionalized polystyrene (PS) and end-functionalized polystyrene- block -polyisoprene (SI diblock) copolymer were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and oscillatory shear rheometry. For the st…
Blends of poly(2-vinylpyridine), polystyrene, and poly(methyl methacrylate) of four different compositions (2:3:0, 3:2:0, 1:1:0, and 2:2:1 w:w:w) were spin-cast onto periodically (λ = 4 μm) patterned substrate (with two alternating stripes: Au attracting PVP and neutral self-assembled monolayer), and resulting film mo…