Materials Literature
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Photostimulated discharge spectroscopy of cellular polypropylene films between 200 and 400 nm showed the existence of at least three distinct trapping levels at 4.6, 5.6, and 6.3 eV. The effects of UV irradiation on the piezoelectric d33 coefficient was studied by monitoring thickness-extension resonances in the diele…
The equilibrium and nonequilibrium segmental dynamics of bisphenol-A-polycarbonate (PC) have been investigated near the glass transition by studying the rotational and translational diffusion of probe molecules in the polymer matrix. The temperature dependence of equilibrium dynamics was studied from 149 to 124 °C. We…
Jute yarns were pretreated by alkali (5% NaOH) and were grafted with two types of monomer such as 3‐(trimethoxysilyl)‐propylmethacrylate (silane) and acrylamide (AA) under ultraviolet (UV) radiation. The monomer concentrations were 30% in Methanol (MeOH) and irradiation times were 30 min and 60 min for silane and AA,…
Short-time retention loss behaviors were investigated for fatigued Pt/PbZr0.4Ti0.6O3/Pt capacitors. In the short-time regime of t<1 s, fatigued capacitors showed a significant loss in retained polarization, which could be well described by a power-law function. This behavior was interpreted in terms of a superp…
We have synthesized a-axis-oriented epitaxial thin films of layered vanadate Sr2−xLaxVO4 on LaSrAlO4 (100) substrates using a pulsed-laser deposition technique. Epitaxial interface energy stabilizes compounds from V4+ (x=0) to V3+ (x=1), for which none of bulk single crystal has been synthesized. The transport propert…
Infrared (IR) spectra of cellulose, cellulose carbamide, cyanoethyl cellulose, cellulose acetate, and acetylated cyanoethyl cellulose from 400 to 4000 cm−1 were studied. All cellulose derivatives have lower crystallinity index than cellulose except cellulose carbamide, which is attributed to hydrogen bond strength. Di…
High-Tm relaxor materials are being developed for high-temperature high-power density electrotransduction applications and high-temperature capacitors in automobile applications. A relaxor ferroelectric material of composition 0.3BiScO3–0.6PbTiO3–0.1Pb(Mn1/3Nb2/3)O3 having a very high dielectric maximum of ∼350 °C is…
[structure: see text] Palladium-catalyzed coupling of 1,2-bis(4-bromophenyl)-3,4,5,6-tetraphenylbenzene and the corresponding hexaphenylbenzene bis(boronic acid) gave a mixture of linear and cyclic oligomers of hexaphenylbenzene. An X-ray crystal structure of the tetrameric oligomer showed it to be the polyphenylene m…
We compare optical properties of ${\mathrm{Sm}}^{3+}$-doped ${\mathrm{ZnS}}_{0.8}{\mathrm{Se}}_{0.2}/\mathrm{undoped}$ ZnS multiple-quantum wells (MQWs) with different well widths (2, 5, 10 monolayers) and bulk ${\mathrm{ZnS}}_{0.8}{\mathrm{Se}}_{0.2}:{\mathrm{Sm}}^{3+}$ crystal. The excitonic peak in the photolumines…
We consider a binary mixture of hard colloidal spheres and nonadsorbing polymer coils. The polymers are regarded as effective spheres that interact with one another via a repulsive step-function pair potential and with colloids solely via excluded volume. The system is treated with a geometry-based density functional…
#Reprinted from Supramolecular Polymers, Ciferri, A., Ed.; Marcel Dekker, Inc.: New York, 2000, 359–434.
The photoalignment of alternate layer-by-layer (LBL) deposited water-soluble azobenzene dye, direct red 80 (DR80), and polycations have been investigated. The ultrathin films were probed by polarized irradiation, UV−vis spectroscopy, and angle-dependent optical retardation measurements using a hybrid liquid crystal (L…
The Stokes–Einstein (SE) relation is a form of the fluctuation-dissipation theorem (FDT), and relates the diffusion coefficient of colloidal particles to the viscosity via the thermal energy kBT. We study the diffusion coefficient and viscosity of concentrated hard-sphere colloidal model systems in the frequency domai…
We describe the syntheses and electrochemical properties of four oligothiophene derivatives endowed with the tricyanovinyl (TCV) group, which facilitates reduction and promotes π-stacking, suggesting these materials may be suitable for n-type, and possibly ambipolar, transport. Compound 1 crystallizes in the noncentro…
Crystalline boron nanowires were produced through post-annealing amorphous boron nanowires synthesized by rf magnetron sputtering. High-resolution transmission electron microscopy was used to characterize the microstructure of the crystalline boron nanowires. Selected-area electron diffraction studies showed that the…
We have performed dielectric hole burning experiments on supercooled glycerol at frequencies up to five decades above the peak frequency of the dielectric loss. While most observations of heterogeneous dynamics refer to the slower than average relaxation times, this study confirms the existence of independent relaxati…
A series of regular alternating terpolymers of ethene and propene with carbon monoxide with different Et/CO content was characterized by wide- and small-angle x-ray scattering, differential scanning calorimetry, and diamagnetic susceptibility measurements. All terpolymers proved to be amorphous at room temperature. Th…
Poly(ethylene terephthalate) (PET) powder was depolymerized at atmos‐ pheric pressure in sulfuric acid in presence of 2.5 N phosphoric acid at 88–140°C. Particle sizes ranging from 50 to 512.5 µm and reaction time 30–200 min required for PET hydrolysis were optimized. Terephthalic acid (TPA) and ethylene glycol (EG) w…
We demonstrate the importance of anisotropic interface properties in microstructure evolution by comparing computed evolved microstructures to final experimental microstructures of 5170 grains in 19 thin aluminum foil samples. This is the first time that a direct experimental validation of simulation has been performe…
Organic derivatives of a layered perovskite compound, HLaNb 2 O 7 · x H 2 O (HLN), with interlayer surfaces possessing n -alkoxyl groups ( n -decoxyl and n -propoxyl) have been allowed to react with various alcohols and a diol (ethylene glycol) to form new organic derivatives via substitution reactions. The reaction o…