Materials Literature
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Abstract The aim of this investigation was to evaluate the possibility of mechanically recycling blends of ABS with minor amounts of semicrystalline engineering plastics, such as polyamide, poly(ethylene terephthalate), and poly(butylene terephthalate). Compatibilizers and a core–shell impact modifier were incorporate…
The quenching of photoluminescence (PL) intensity due to exposure to laser radiation (0.25 W cm −2 ) and complete recovery is observed for porous silicon nanoparticles (PSNs) embedded in an optically transparent ultraviolet cured polymer. Under identical laser exposures, the PL intensity of PSNs embedded in transparen…
The physical properties of plasma-deposited hydrogenated amorphous-carbon films (a-C:H) are investigated and correlations to the competing intrinsic and extrinsic stress fields are established. The (a-C:H) films are grown on single-crystal 〈100〉 silicon substrates in a plasma reactor using acetylene as a precursor. Al…
Abstract New conjugated copolymers containing alternating N ‐hexyl‐3,8‐iminodibenzyl and divinylbenzene chromophores {poly( N ‐hexyl‐3,8‐iminodibenzyl‐1,2‐ethenylene‐2,5‐dihexyloxy‐1,4‐phenylene‐1,2‐ethenylene) ( P1 ) and poly[ N ‐hexyl‐3,8‐iminodibenzyl‐2,5‐bis(hexyloxy)cyanoterephthalidene] ( P2 )} were synthesized…
Amine addition to cis -aconityl anhydride has been used to prepare monomers needed to make water-soluble polymers that are being developed for biomedical applications. Unfortunately competitive decarboxylation, double bond isomerization, and hydrolysis reactions of cis -aconityl anhydride have been observed during mon…
The spectral variation of the effective dielectric constant in porous silicon thin films is modeled using effective medium theories. The pores in the material are supposed to be spheroid prolate inclusions in a homogeneous matrix. We employ modified Maxwell–Garnett and Bruggeman expressions obtained from previous work…
Solid oxide fuel cells comprised of an anode made from sintered and reduced mesoporous-NiO-YSZ are shown to provide stable current and power densities at the operating temperature of 800 degrees C and show better performance than cells with anode cermets made from mechanical mixtures of NiO and YSZ, attributable to th…
The functional form of the time decay of the remanent polarization under high-electrical drives, known as fatigue, has been derived for relaxor piezoelectric materials based on the hierarchical relaxation process, typical of disordered systems such as random-field and glassy states and is given in terms of normalized…
The effect of oxidation and annealing on the electrical properties of grain boundaries (GBs) in heavily doped polycrystalline silicon is characterized using bulk films and 30-nm-wide nanowires. Oxidation at 650–750 °C selectively oxidizes the GBs. Subsequent annealing at 1000 °C increases the associated potential barr…
Epitaxial films of (1−x)Pb(Yb1/2Nb1/2)O3−xPbTiO3 (PYbN–PT, x=0.4,0.5) with SrRuO3 bottom electrodes were prepared on (100) LaAlO3, (100) SrTiO3, and (111) SrTiO3 substrates by pulsed laser deposition. It was found that vacuum annealing of the SrRuO3 before the deposition of PYbN–PT facilitated growth of perovskite PYb…
Abstract Dynamic mechanical properties of nonirradiated and irradiated blends of polyethylene (PE) and ethylene vinylacetate (EVA) copolymer have been determined. Effect of addition of EVA and radiational crosslinking on loss and storage modulus, tan δ, and transition temperatures were determined. Increase in transiti…
Neutron diffraction data on three isotopically substituted samples of liquid water in the supercooled regime are presented. Supercooling of ultrapure water has been achieved by means of a polytetrafluoroethylene coating on a standard vanadium sample container. Supercooling water to T=267 K, with density ρ=100.2 atoms/…
In view of the difficulty in preparing single crystals, a c-axis oriented epitaxial lead zirconate titanate (PZT) film was prepared as a model system for the single-crystalline PZT. By employing an extraordinary backscattering configuration in which the relevant phonon wave vector, k, is parallel to the film/substrate…
We study the structural properties of two-dimensional granular packings prepared by random deposition from a source line. We consider a class of random ballistic deposition models based on single-particle relaxation rules controlled by a critical angle, and we show that these local rules can be formulated as rolling f…
We examined the Raman spectra of nanostructured carbon films grown using the ammonia-containing feed gas at two excitation wavelengths, 514.5 and 1064 nm. The increase of the ammonia concentration in the feed gas resulted in two prominent changes: the complete morphology change (from nanoparticle dominance to nanotube…
Antiferroelectric PbZrO3 (PZ) films have been fabricated on LaNiO3/Pt/Ti/SiO2/Si substrates using a sol-gel process. The films with perovskite structure showed highly 〈001〉 preferred orientation. An antiferroelectric phase was identified by the presence of 1/4{110} superlattice spots in a [001] selected area electron…
We present an alternative approach to tune the third-order nonlinear optical properties of organic molecules by inserting a functional group into the path of the π-electron conjugation instead of at its ends. We show that this scheme has a beneficial influence on the second-order hyperpolarizability for short molecule…
Temperature dependent electromechanical investigations of 〈110〉, 〈001〉, and 〈111〉 oriented morphotropic phase boundary compositions of Pb(Mg1/3Nb2/3)O3-PbTi03 crystals have been performed. Softening of the dielectric constant, piezoelectric constant, and Young’s modulus was found for all three orientations, near a fer…
The morphology of the porous network in porous SiC has been studied. It has been found that pore formation starts with a few pores on the surface and then the porous network grows in a V-shaped branched structure below the surface. The hydrogen etching rates of porous and nonporous SiC have been measured. Etch rates o…
Sensitized photoreduction of Ag+ ions and subsequent formation of colloidal Ag nanoparticles take place when an aqueous solution of a mixture of AgClO4, sodium dodecylsulfate (SDS) and benzophenone (BP) is irradiated with near-UV light. In this study, the mechanism and kinetics of the reaction have been studied by mea…