Materials Literature
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Accurate determination of thermal parameters of microbolometer-based sensors is of considerable interest for many applications. The most important parameters are thermal time constant, heat capacitance and thermal conductance. In this work, we have developed a technique to measure all three quantities using a single e…
The dynamics of addition polymerization-induced phase separation in a liquid crystal solvent is examined via confocal microscopy in systems where the final morphology consists of nematic liquid crystal domains suspended in a cross-linked polymer matrix. For low polymer concentrations, we observe unusually rapid hydrod…
Magnetization measurements of a ${\mathrm{Gd}}_{0.5}{\mathrm{Ba}}_{0.5}{\mathrm{CoO}}_{3}$ perovskitelike compound have revealed an anomalous behavior at ${T}_{i}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}240\mathrm{K}$ and ${T}_{C}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}277\mathrm{K}$ that correspo…
Spatially resolved electron energy loss spectroscopy is used to characterize the cross-sectional structure of highly tetrahedral amorphous carbon films, particularly concentrating on the ${\mathrm{sp}}^{2}$ bonded surface layer. The surface layer is shown to be due to subsurface conversion from ${\mathrm{sp}}^{2}$ to…
Ring torsion effects on optical excitation properties in poly(para-phenylene) (PPP) and polyaniline (PAN) are investigated by extending the Shimoi-Abe model [Synth. Met. 78, 219 (1996)]. The model is solved by the intermediate exciton formalism. Long-range excitons are characterized, and the long-range component of th…
X-ray resonant scattering at the $K$-edge of transition-metal oxides is shown to measure the orbital order parameter, supposed to accompany magnetic ordering in some cases. Virtual transitions to the $3d$ orbitals are quadrupolar in general. In cases with no inversion symmetry, such as ${\mathrm{V}}_{2}{\mathrm{O}}_{3…
We propose that glass-forming liquids are intrinsically under the influences of both fluctuating interactions and random fields well-known in the field of spin systems. This is due to the frustration between the isotropic and anisotropic parts of effective intermolecular interactions. Our model indicates the existence…
We study dendritic microstructure evolution using an adaptive grid, finite element method applied to a phase-field model. The computational complexity of our algorithm, per unit time, scales linearly with system size, allowing simulations on very large lattices. We present computations on a ${2}^{17}\ifmmode\times\els…
Silicon nanowires have been synthesized in high yield and high purity by using a high-temperature laser-ablation method with growth rates ranging from 10 to 80 μm/h. Transmission electron microscopic investigation shows that the nanowires are crystalline Si, and have diameters ranging from 3 to 43 nm and length up to…
Synthesis and characterization of a new series of low molecular weight (MW = 500–3000) OH-terminated linear aliphatic unsaturated polyesters based on cis-2-butene-1,4-diol and oxalic to sebacic acid were investigated. Direct polycondensation and transesterification methods were used for the syntheses. The latter was r…
3151-3154
Surface modification of poly(aryl ether ether ketone) (PEEK) film surfaces by oxygen plasma treatment was investigated. Two procedures, the direct plasma treatment and the remote oxygen plasma treatment, were used as oxygen plasma treatments, and the efficiency of the hydrophilic modification was discussed. The direct…
Studies of PANI protonation in fluorinated alcohols are presented. Three solvents have been tested, namely 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), 1,1,1,3,3,3-hexafluoro-2-phenyl-2-propanol (HFPP), and 1,1,1,3,3,3-hexafluoro-2-( p -tolyl)-propanol (HFTP). It has been demonstrated that the degree of the broadening of…
Blends of poly( N -phenyl-2-(2‘-thienyl)-5-(5‘‘-vinyl-2‘‘-thienyl)pyrrole) ( PSNPhS ) and poly( N -vinylcarbazole) ( PVK ) were prepared in mass ratios of 1:4, 3:2, and 4:1. Their electrochromic properties were characterized using cyclic voltammetry, in situ spectroelectrochemistry, and spectrocolorimetry. Solid-state…
The binding of several lanthanide(III) ions to anthracycline antitumor antibiotics daunomycin and adriamycin in methanol and aqueous solutions has been studied by means of optical and 2D NMR (COSY, TOCSY, and EXSY) techniques. These results indicate that a 1:1 Yb(3+)-drug complex (1) is the predominant complex at a me…
A flexible polyurethane foam fire-retarded with 7.8% tris (1,3-dichloro-2-propyl) phosphate (TDCPP) was found to lose by volatilization 80% of this material at 200°C, a temperature at which there is as yet little decomposition of the foam. It is therefore to be expected that when this foam burns, most of its TDCPP wil…
Rates of isobutane dehydrogenation and isobutene hydrogenation were measured over Pt/Sn/SiO 2, Pt/Sn/K/SiO 2, and Pt/Sn/K−L-zeolite catalysts at temperatures from 673 to 773 K and at various partial pressures for a total pressure of 1 atm. Addition of potassium to Pt/Sn/SiO 2 enhances the rate of isobutene hydrogenati…
Complexes of bis(hexafluoroacetylacetonato)copper(II) [Cu(hfac)(2)] ligated with 3- and 4-(N-oxyl-tert-butylamino)pyridines (3NOPy and 4NOPy) and N-{3- and 4-(N-oxyl-tert-butylamino)phenyl}imidazoles (3NOIm and 4NOIm) were prepared. The 1:2 complexes [Cu(hfac)(2)(3NOPy and 4NOPy)(2)] have hexacoordinated octahedral st…
An on-line experimental technique was developed for the measurement of fiber diameter and temperature during the melt-blowing process. The experimentally determined diameters and temperatures were compared with a mathematical model for melt-blowing.
Cellulose, cellulose diacetate (CDA), cellulose triacetate (CTA), cellulose nitrate (CN), and cellulose phosphate (CP) were subjected to dynamic thermogravimetry in nitrogen and air. The thermostability of the cellulose and its esters was estimated, taking into account the values of initial thermal degradation tempera…