Materials Literature
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Pinning and depinning of wavefronts are ubiquitous features of spatially discrete systems describing a host of phenomena in physics, biology, etc. A large class of discrete systems is described by overdamped chains of nonlinear oscillators with nearest-neighbor coupling and controlled by constant external forces. A th…
The Kroemer model for the Gunn effect in a circular geometry (Corbino disks) has been numerically solved. The results have been interpreted by means of asymptotic calculations. Above a certain onset dc voltage bias, axisymmetric pulses of the electric field are periodically shed by an inner circular cathode. These pul…
Positron lifetime, Photoluminescence and Hall measurements were performed to study undoped p-type gallium antimonide materials. A 314ps lifetime component, attributed to $V_{Ga}$ related defect, was identified in the positron lifetime measurement. In the PL measurement, a $778meV$ and a $797meV$ peaks were observed. I…
Two silver-impregnated activated carbons (SIACs) (0.05 and 1.05 wt % silver) and their virgin (i.e., unimpregnated) granular activated carbon (GAC) precursors were investigated for their ability to remove and sequester iodide from aqueous solutions in a series of batch sorption and leaching experiments. Silver content…
1. Introduction 2. Molecular dynamics simulation of amorphous carbon structures 3. Atomistic simulation of the bombardment process during the BEN phase of diamond CVD 4. Growth of amorphous silicon 5. One-dimensional hopping in disordered organic solids
The vapochromic and vapoluminescent compound Pt(CN-p-(C(2)H(5))C(6)H(4))(2)(CN)(2) (abbreviated PtC(2)) is conveniently synthesized by the thermal rearrangement of [Pt(CN-p-(C(2)H(5))C(6)H(4))(4)][Pt(CN)(4)]. Recrystallization of PtC(2) gives a crystalline orange morph (O-PtC(2)) and an amorphous purple morph (P-PtC(2…
Evidences of a monoclinic phase in unpoled $({\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}{)}_{1\ensuremath{-}x}\ensuremath{-}({\mathrm{PbTiO}}_{3}{)}_{x}$ with $x=0.35$ (PMN-PT 35%) and unpoled $({\mathrm{PbZn}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}{)}_{1\ensuremath{-}x}\ensuremath{-}({\mathrm{PbTiO}}_{…
Abstract A main‐chain phosphorus‐containing diepoxide, bis‐glycidyloxy phenylphosphate (BGPP), was synthesized, then blended with various contents of a 4,4′‐diglycidylether of bisphenol A (DGEBA)‐type epoxy resin, DER 331. The curing reactions of the blended resins with diethyltriamine (DETA) and the thermal propertie…
Abstract Al(OH) 3 /polypropylene (PP) composites modified by in situ ‐functionalized polypropylene (FPP) were prepared by a one‐step melt‐extrusion process. The effect of in situ FPP on the crystallization and melting behavior, melt‐flow index, limiting oxygen index, thermal degradation, mechanical properties, and fra…
Hg2Os2O7 has been synthesised by direct reaction of HgO, OsO4 and Os metal at 500 °C. The product adopts the pyrochlore structure, in common with Cd2Os2O7, but exhibits a slightly larger lattice parameter at 10.245 Å. The material shows a weak transition to antiferromagnetic behaviour below 88 K; the compound remains…
We have developed a new, extremely sensitive real-space technique (intensity fluctuation microscopy) to probe the order of the nematic-smectic-A (NA) transition. Using this technique, we show that the NA transition in 4'-n-octyl-4-cyanobiphenyl (8CB) is clearly first order, contrary to calorimetric studies but in agre…
Abstract Swelling and dissolution behavior of poly(methyl methacrylate) (PMMA) films during unidimensional penetration of methyl ethyl ketone/methyl alcohol (MEK/MA) liquid mixtures at 22°C is presented. Optical microscopy and two‐beam interferometry were applied to clamped PMMA films to obtain information on penetrat…
Molecular dynamics simulations were employed in bulk polyisobutylene, to provide a detailed characterization of the methyl dynamics and to examine its relation to the β-relaxation as described by different experimental techniques. The simulation results were compared to new 13 C NMR measurements probing methyl motion…
Ultrathin films of titanium (hydr)oxide with precise control over film thickness (via number of cycles) can be prepared by the alternate adsorption of an organic polyelectrolyte and a titanium lactate complex, followed by calcination. Thereafter, the layer appears to be composed of nanometer-sized particles with a fus…
Abstract Skin–core microstructures in hydrated lyocell cellulose fibers were investigated using microfocus small‐angle X‐ray scattering (SAXS). Both single fibers and fiber cross sections were observed. In all the fibers studied, a thin skin layer was observed in which the voids were smaller in cross section and bette…
We have measured the Hall resistivity for the intermetallic compound ${\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{V}}_{x}{\mathrm{Al}}_{y}$ $(x=0.5--1.05;$ $y=0.95,1.05)$ at room temperature. The Hall coefficient changed its sign from positive to negative around the Heusler composition (i.e., $x=y=1)$ with increasing x v…
Abstract Several methods have been developed for grafting materials to the surface of polymers to alter their surface characteristics. This article reports a procedure for grafting poly(acrylic acid) (PAA) onto nylon 6,6 films via the naturally occurring amine end groups of nylon 6,6 using N ‐hydroxy‐succinimide in co…
The effect of surface functionalization on the interfacial adhesion between two immiscible semicrystalline polymers, polypropylene (PP) and a polyamide (nylon 6, Ny6)), was investigated. The surface of PP was functionalized by a low-energy ion-beam-assisted gas reaction. Surface functional groups containing carboxyl a…
The cationic donor–(π-bridge)–acceptor dye, E-4-[(N-alkyl-5,6,7,8-tetrahydroisoquinolinium-5-ylidene)methyl]-N,N-dibutylaniline octadecyl sulfate is a molecular rectifier. Its Langmuir–Blodgett films exhibit asymmetric current–voltage characteristics but the dodecyl and octadecyl analogues behave differently. Rectific…
Two of the sugars involved in the protection of living organisms, trehalose and sucrose, were employed to analyze the effect of different salts (MgCl2, CaCl2, KCl, NaCl) on sugar crystallization kinetics. The conductivity behavior in supercooled aqueous sugar–salt systems was also studied to evaluate the extent of wat…