Materials Literature
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It is well known that the ${A}_{1}(\text{TO})$ phonon with its eigenvector parallel to the unique $c$ axis of the 4mm symmetry is primarily responsible for the manifestation of displacive ferroelectricity in ${\text{ABO}}_{3}$-type perovskites. We have theoretically examined the softening behavior of this ${A}_{1}(\te…
We report a method of fabrication of free standing and ultra-thin carbon nanotube-parylene-C interpenetrating networks. The network is highly transparent, highly flexible, and more conductive than transparent nanotube/polymer composites. Scanning electron microscope imaging reveals that the interpenetrated networks ar…
Abstract Multistimuli responsive grafted poly(ether tert ‐amine) (gPEAs), which were comprised of poly(propylene oxide) (PPO) in backbone and poly(ethylene oxide) (PEO) as grafted chain, were successfully synthesized through nucleophilic addition/ring‐opening reaction of commercial poly(propylene glycol) diglycidyl et…
The effect of entrapped beta-cyclodextrin (beta-CD) on the stability of multilamellar vesicles (MLVs) of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), prepared by the dehydration-rehydration method, was studied by monitoring the release of 5(6)-carboxyfluorescein encapsulated into the liposomes. Different h…
The geometries, chemical shifts, aromaticity, and reactivity of finite-length open-ended armchair single-walled carbon nanotubes (SWCNTs) have been studied within density functional theory. The widely used model of capping hydrogen atoms at the open ends of a SWCNT changes the chemical activity of the SWCNT and destab…
A series of lead sulfide (PbS) nanocrystals grown in oleic acid (OA), poly(1-decene) (PD), poly(1-butene) (PB), and poly(vinyl alcohol) (PVA) were synthesized. The relationship between nonlinear optical properties and surface properties of PbS nanocrystals were analyzed using 532 and 1064 nm nanosecond open-aperture Z…
Non-Euclidean geometry, combined with transformation optics, has recently led to the proposal of an invisibility cloak that avoids optical singularities and can, therefore, work, in principle, in a broadband of the spectrum [U. Leonhardt and T. Tyc,Science, vol. 323, pp. 110–112, 2009]. Such a cloak is perfect in the…
Promoted ignition describes a situation in which a substance with relatively low compatibility with oxygen ignites and supports the combustion of a more oxygen-compatible material. As a consequence, this mechanism could lead to significant component damage in a high-pressure oxygen system. Current cleaning specificati…
Abstract Organic–inorganic composites have received increasing attention because such composites exhibit improved optical, electrical, thermal, and mechanical behaviors by combining properties of both organic polymers and inorganic compounds. However, tensile strength is enhanced generally at the cost of decreasing du…
A combination of Auger electron spectroscopy and temperature-programed desorption was used to characterize the growth and interaction of Pd films with positively and negatively terminated ferroelectric LiNbO3(0001) surfaces. The growth mode of vapor-deposited Pd layers at 300K was found to be dependent on the directio…
Silk fibroin was evaluated as a new matrix for immobilized cell fermentation. Silk fibroin was extracted from Bombyx mori cocoon, purified, concentrated in polyethylene glycol solution and diluted to 3 wt% with distilled water. This fibroin solution was used to encapsulate sensitive cells of the probiotic strain, Bifi…
Abstract This article covers the thermal properties of cumene hydroperoxide (CHP) and dicumyl hydroperoxide (DCPO). Differential scanning calorimetry (DSC) was employed to determine the reaction kinetics, heat of decomposition (Δ H d ), exothermic onset temperature ( T 0 ), reaction order ( n ), etc. A thermal activit…
Abstract Catalytic properties of the sandwich‐type heteropolytungstate [P 2 W 21 O 71 (H 2 O) 3 ] 6– ( 1 ) in the selective oxidation of three representative organic substrates, methyl phenyl sulfide, cyclohexene, and cyclohexanol, with aqueous H 2 O 2 have been studied in acetonitrile. With one equivalent of hydrogen…
Abstract The aim of the work is to give an explanation of the magnetic properties of a mixed‐valence [GeV 14 O 40 ] 8– polyoxometalate reduced by two electrons, which, in contrast to what happens in other two‐electron‐reduced polyoxometalates, does not show any magnetic coupling between the two unpaired electrons. For…
Abstract In this study, the structure–property relationships for a series of statistical 2‐nonyl‐2‐oxazoline (NonOx) and 2‐phenyl‐2‐oxazoline (PhOx) copolymers were investigated for the first time. The copolymerization kinetics were studied and the reactivity ratios were calculated to be r NonOx = 7.1 ± 1.4 and r PhOx…
The electroless Ag coating of fly ash cenospheres employing polyaniline activator was investigated after polyaniline activator was coated on the surfaces of the cenosphere particles by in situ chemical polymerization. The composites were characterized by scanning electron microscopy, Fourier transform infrared spectro…
Abstract The water‐gas shift (WGS) reaction was carried out in the presence of Pd and Pt substituted nanocrystalline ceria catalysts synthesized by solution combustion technique. The catalysts were characterized by powder XRD and XPS. The noble metals were found to be present in ionic form substituted for the cerium a…
In this paper, we present our main results on the structural and optical properties of light-emitting amorphous silicon nitride (SiNx) films fabricated by reactive magnetron cosputtering. In particular, we discuss the origin of the visible emission in amorphous silicon nitride films and investigate the optical emissio…
We propose to model periodic structures by equivalent multiconductor transmission lines (MTLs). The developed technique is based on a multimodal representation of the periodic structure unit cell, such as required for periodically loaded MTLs and periodically loaded waveguides with higher order evanescent mode interac…
Pressure and oxygen concentration limits for the upward propagation of combustion of two aluminum alloys and two aluminum bronzes have been determined in oxygen diluted by either argon or nitrogen. The gas mixtures flowedover the metal specimens at a flow rate of 0.33 standard L/s in a 41-mm inside diameter vessel and…