Materials Literature
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Two types of bacteria were placed on the top surface of carbon nanotube films and the composite film morphology was examined using scanning electron microscopy. The interaction of bacteria with the carbonaceous film was studied after drying and subsequent heating to 1000 C. For gram-positive bacteria, subsequent shrin…
For the manganites of ${R}_{1\ensuremath{-}x}{\text{Sr}}_{x}{\text{MnO}}_{3}$ ($R={\text{Nd}}_{0.5}{\text{Sm}}_{0.5}$, Sm, and Eu), the new $q\ensuremath{\sim}1/3$ charge/orbital ordering with the orbital modulation vector of $(0,\text{ }q,\text{ }0)$ in an orthorhombic $Pbnm$ setting is observed at $0.5<x<0.6$,…
Commercial methods for producing multiwalled carbon nanotubes (MWCNTs), such as chemical vapor deposition (CVD), employ transition metal catalysts. Therefore raw MWCNTs usually contain metal catalysts and other carbon impurities. Acid treatments are commonly used to eliminate these impurities, which can reduce the len…
Abstract Multiwalled carbon nanotubes (MWNTs) were synthesized on Al 2 O 3 supported Ni catalysts from C 2 H 2 and C 2 H 4 feedstocks in a fluidized bed. The influence of the ratio of superficial gas velocity to the minimum fluidization velocity ( U / U mf ), feedstock type, the ratio of carbon in the total quantity o…
The effective permittivity and the variable phase shift of a microwave phase shifter using a liquid crystal loaded coplanar waveguide with floating electrode (CPW-FE), and the dielectric birefringence (Δϵ) of the liquid crystal layer in a liquid crystal microwave phase shifter are calculated, taking into account molec…
Two molecular modes of amphiphilic block copolymer-carbon nanotube interactions have been identified in the literature, one involving the adsorption of individual block copolymer molecules on the carbon nanotubes and the other involving the adsorption of multimolecular, spherical micelles. In both cases, the nature of…
This study examined the threshold switching voltage (VT) of 150 nm thick SiO2 doped Ge2Sb2Te5 (SGST) films for phase change random access memory applications. The VT of the SGST films increased from ∼0.9 V (for GST) to ∼1.5 V with increasing SiO2 content. The optical band gap and Urbach edge of the SGST films were sim…
This chapter presents and discusses recent achievements towards determining and interpreting polarizabilities and hyperpolarizabilities of atoms, molecules, clusters, supramolecular assemblies, polymers, and aggregates. It evidences both the strong activities in the field and their dual character. Indeed, on the one h…
Although the analysis of electromagnetic sources in the context of coordinate transformations and the implications for transformation optics have been discussed in the literature, a correct formulation that includes surface and line currents has not been reported. Here we derive how surface and line currents behave un…
Abstract Two types of environmentally friendly jute‐fiber‐reinforced green composites based on Mesua ferrea L. were prepared with poly(urethane ester) and poly(urethane amide) resin blends with commercially available partially butylated melamine–formaldehyde and epoxy resins through solution impregnation and hot‐curin…
In a sharp contrast to bulk Sm0.55Sr0.45MnO3 (SSMO) the SSMO films grown on LaAlO3 and SrTiO3 substrates exhibit insulating behavior with a negligible magnetoresistive effect. However, when these films are buffered by a thin layer of Nd0.55Sr0.45MnO3 a large low field magnetoresistance along with the bulklike properti…
A 2D computational fluid dynamics (CFD) model is developed to study the performance of an advanced planar solid oxide fuel cell based on proton conducting electrolyte (SOFC-H). The governing equations are solved with the finite volume method (FVM). Simulations are conducted to understand the transport phenomena and el…
Dispersions were studied of multiwall carbon nanotubes in cholesteric liquid crystals of three types: nematics with chiral dopant, mixtures of cholesterol derivatives, and similar mixtures close to smectic-A transition. In the first two cases, no appreciable effects of nanotubes upon selective reflection spectra were…
La 0.7 Sr 0.3 MnO 3 (LSMO) thin films grown by pulsed laser deposition on SrTiO 3 (STO) substrates with (1 0 0) and (1 1 0) crystallographic orientations are characterized by means of magneto-optic (MO) 'Kerr' spectroscopy at polar and longitudinal magnetizations combined with spectroscopic ellipsometry (SE) in the ph…
Abstract The characteristic features of LLDPE polymerization with ZN catalyst are the time drift effect during polymerization and the bending effect when trying to decrease density of the copolymer by adding more comonomer to the polymerization. The time drift in LLDPE polymerization is revealed by a constant decrease…
By hydrogen insertion into Ni51Mn49−xInx (x=16.2,16.6) Heusler alloys, the interstitial compounds Ni51Mn49−xInxHδ were fabricated. The introduction of H atoms does not change the L21 structure of the alloys but shifts martensitic temperature (TM) to lower temperature. Magnetic measurements indicated the hydrogenated N…
Density-functional calculations were carried out for ${\text{AgCrO}}_{2}$ to examine its spin exchange and ferroelectric polarization. In the multiferroic state of ${\text{AgCrO}}_{2}$ the triangular spin lattice of each ${\text{CrO}}_{2}$ layer forms parallel chains with helical-spin order. The spin exchange interact…
We have used density functional theory (DFT) calculations to investigate the oxidation of ammonia (NH 3 ) on a RuO 2 (110) surface. We characterized the possible reaction pathways for the dehydrogenation of NH x species ( x = 1−3) and the formation of the oxidation products N 2, NO, and H 2 O. The presence of oxygen a…
The effect of an ultrasonic wave on the nematic texture has long been known, but its interpretation in terms of a coherent dynamical theory has not yet been achieved. A proposal for such a theory is made in this paper. The diverse theoretical approaches attempted in the past to describe the interaction between sound a…
We developed an electro-optical device based on the flexoelectric effect of a polymer-stabilized cholesteric liquid crystal with a uniform lying helix. Using a dual-frequency switchable nematic, a small amount of chiral dopant and a small amount of phase-separated polymer localized at the substrate surfaces, we were a…