Materials Literature
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Electrically pumped light emission was observed from a smectic mesophase of liquid-crystalline oxadiazole; 2,5-hexyloxybiphenyl–hexyloxyphenyl–oxadiazole (HOBP-OXD), which exhibits high electron transport capability. The light-emitting diode consisted of the HOBP-OXD film, a copper phthalocyanine vacuum deposited film…
Phosphor thermography, relying on the temperature dependence of the decay time of photoluminescence from suitable phosphors, provides remote measurement of the temperature of components. Such a phosphor is yttrium oxide doped with europium (Y2O3:Eu). Associated with this phosphor is also a rise time. Demonstrated is t…
The pressure and entropy of the face-centred cubic and hexagonal close-packed hard-sphere crystals were measured. At the melting density, the hcp crystal has a higher pressure. A precise equation of state is reported for the crystals. The equation extrapolates to a spinodal instability in the metastable low-density cr…
${}\left(222\right)$ MgO/Cu interfaces produced by internal oxidation are studied by electron energy loss spectroscopy (EELS) using an atomic sized electron beam. We determine interfacial chemistry of this interface with subnanometer spatial resolution and use EELS to measure directly the electronic states pertaining…
${}^{13}\mathrm{C}\ensuremath{-}\mathrm{NMR}$ measurements have been performed to investigate the nature of the insulating state of a quasi-one-dimensional conductor, $(\mathrm{DI}\ensuremath{-}\mathrm{DCNQI}{)}_{2}\mathrm{Ag}$, with a quarter-filled band. The ${4k}_{F}$ charge-density wave has been evidenced below ab…
The size, shape, and polarization orientation of fatigued areas formed during the suppression of the switchable polarization (Prs) (fatigue) in Pt–PZT–Pt ferroelectric capacitors (FECAPs), were observed by means of atomic force microscopy and by imaging the phase of the piezoelectric vibration induced by a low ac fiel…
We measure the IQHE on macroscopic (1.5cm x 1.5cm) "quick 'n' dirty" prepared III-V heterostructure samples with van der Pauw and modified Corbino geometries at 1.3 K. We compare our results with (i) data taken on smaller specimens, among them samples with a standard Hall bar geometry, (ii) results of our numerical an…
Based on ab initio calculation, we propose a new structure for the fundamental excitation of the reconstructed 30$^\circ$ partial dislocation in silicon. This soliton has a rare structure involving a five-fold coordinated atom near the dislocation core. The unique electronic structure of this defect is consistent with…
We present momentum-dependent measurements of the density response function of bulk samples of purified single-wall nanotubes probed by electron energy loss spectroscopy. Carbon nanotubes support excitations between both delocalized and localized electronic states. The $\ensuremath{\pi}$ plasmon exhibits a q dependenc…
We introduce an approach to exploit the existence of multiple levels of description of a physical system to radically accelerate the determination of thermodynamic quantities. We first give a proof of principle of the method using two empirical interatomic potential functions. We then apply the technique to feed infor…
The thermal degradation of graphite and glass-reinforced phenolic insulators have been studied at high temperature by using thermogravimetric (TGA) and differential scanning calorimetric analyses. TGA analysis was carried out in a stream of pure nitrogen over temperature range ambient to 900°C and DSC analysis to 500°…
Polydiphenylsiloxane (PDPhS) has been prepared by solution ring opening polymerization of hexaphenylcyclotrisiloxane and characterized by 29 Si solid-state NMR spectroscopy. The thermal characteristics of the polymer have been examined by DSC, dynamic mechanical thermal analysis, linear expansion and X-ray diffraction…
The EPR spectra of [Ru(NH 3 ) 5 (H 2 O)](TFMS) 3 and [Os(NH 3 ) 5 (H 2 O)](TFMS) 3 (TFMS = trifluoromethanesulfonate) have been measured for a range of temperatures for the solid powders and frozen solutions. The g ∥ axis for the “axial” spectrum observed is shown to be perpendicular to the M−O bond axis, as it is per…
Effect of fillers like carbon black, silica, and china clay on the cure characteristics and physicomechanical properties of natural rubber (NR) modified with phosphorylated cashew nut shell liquid (PCNSL) in various proportions has been studied. Prominent cure retardation has been observed with progressive increase in…
The effect of the compatibilizer on the crystallization, rheological, and tensile properties of low-density polyethylene (LDPE)/ethylene vinyl alcohol (EVOH) (70/30) blends was investigated. Maleic anhydride-grafted linear low-density polyethylene (LLD-g-MAH) was used as the compatibilizer in various concentrations (f…
A water-swellable rubber was prepared by blending polychloroprene (CR) with crosslinked sodium polyacrylate (CSP), precipitated silica, poly(ethylene oxide) (PEO), and vulcanizing agents. The preparation process was described and the effect of composition of the water-swellable rubber on its water-absorbent properties…
Profile development and dimensional change in the melt-spinning process of hollow fibers were studied using a finite element method, and a numerical simulation was compared with experimental results. The numerical simulation of a hollow-fiber spinning process was carried out by considering the changes in inner and out…
Polycondensation of squaric acid with a water-soluble pyrrole derivative containing an N -propanesulfonate pendant group gave a water-soluble A−B type oligomer. Similarly, several water-soluble random oligomers were prepared by the polycondensation of pyrrole, sodium 3-(pyrrol-1-yl)propanesulfonate, and squaric acid.…
Soluble conductive polypyrrole (PPy) with room temperature conductivity (2–18 S/cm) has been synthesized by doping polypyrrole with mixed acid containing camphor sulfonic acid (CSA) and dodecyl benzene sulfonic acid (DBSA). The solubility and the room temperature conductivity of PPy doped with mixed acid were measured…
Trisdipicolinate coordination complexes of europium(III), Eu(dpa) 3 3-, have chiral, three-bladed propeller-like structures with either left-handed or right-handed structural helicity about a 3-fold symmetry axis. The left- and right-handed forms of these structures, labeled here as Λ and Δ, respectively, are structur…