Materials Literature
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Copper (Cu) thin films with thicknesses ranging from 300 to 425 nm were prepared at various argon (Ar) pressures on p-type silicon substrates by direct current magnetron sputtering deposition. X-ray diffraction (XRD) and Karl Suss four-point probe were employed to study the film crystallinity and conductivity, respect…
Abstract Two different types of surface modifiers, 3‐aminopropyltriethoxysilane and formamide, were applied to carbon black (CB) particles to lower electrical resistivity of polymer composites prepared by treated CB. Two different matrices, low‐density polyethylene and nylon 6, were chosen to compound with surface mod…
We performed second harmonic generation (SHG) measurements in the nematic liquid crystal formed from polar aromatic polyester which comprises 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid in a molar ratio of 73/27. The polymer is commercially available and called Vectra. The shear-oriented nematic liquid crysta…
Porous 3D polymer scaffolds prepared by TIPS from PLGA (53:47) and PS are intrinsically hydrophobic which prohibits the wetting of such porous media by water. This limits the application of these materials for the fabrication of scaffolds as supports for cell adhesion/spreading. Here we demonstrate that the interior s…
Environmental pollution caused due to petroleum-based plastics is growing worldwide. Soy protein isolate, a potential alternative to some petrochemical polymers, is cheap and available in plenty. This natural biopolymer is chemically modified with urea at 5, 10, and 20% (w/w) and 2M (molar) for better processing condi…
Quasi-Controlled Polymerization through a Nickel\nCatalyst Process of a Functionalized Thiophene\nMonomer: Kinetic Studies and Application to the\nSynthesis of Regioregular Poly(thiophene-3-acetic\nacid)
The newly discovered atom-centered polygonal wheels B8(2-) and B9- are predicted to show ring currents characteristic of aromatic systems. Ipsocentric mapping of induced current density for both molecules attributes a pi diatropic current to the four electrons of the doubly degenerate pi HOMO and a sigma diatropic cur…
Abstract A series of substituted N ‐methylaniline‐blocked polyisocyanates based on 4,4′‐methylenebis(phenyl isocyanate) and poly(tetrahydrofuran) were prepared and characterized thoroughly with FTIR, 1 H NMR, and 13 C NMR spectroscopy methods. Compared with unsubstituted N ‐methylaniline, a blocking agent with an elec…
The synergistic effects of organic montmorillonite (OMMT) and intumescent flame retardant (IFR) based on the ammonium polyphosphate (APP) and pentaerythritol (PER) on flame retardant enhancement of acrylonitrile-butadiene-styrene copolymer (ABS) were investigated by using the limiting oxygen index (LOI), the UL-94 (ve…
Single crystalline TiC nanowires have been synthesized through a chloride-assisted carbothermal reduction process using active carbon, TiO2 and NaCl powders as precursors and carbon-coated cobalt or nickel nanoparticles as a catalyst. The products were characterized by x-ray diffraction, electron microscopy, energy-di…
Abstract Blends of 75/25 chloroprene rubber(CR)/natural rubber (NR) filled with various loadings of precipitated silica were prepared and their processability and mechanical properties as well as their resistance to thermal aging and oil were determined. The blend morphology was also studied using the atomic force mic…
An atmosphere-assisted heating process was utilized to transform mesostructured SiC−C nanocomposites in situ into ordered mesoporous SiOC and SiCN ceramics with relatively small structural shrinkage. The mesostructured SiC−C nanocomposites were fabricated using commercially available polycarbosilane (PCS) as a ceramic…
A direct method for preparation of conjugated polymer-grafted silica particles is reported. Silica particles (0.3 and 5 mum diameter) are treated with a 3-(trimethoxysilyl)propylamine derivative that is functionalized with an aryl iodide unit. A solution step-growth polymerization reaction is performed in solution tha…
Abstract This article explored the possibility of using silica from fly‐ash particles as reinforcement in natural rubber/styrene–butadiene rubber (NR/SBR) vulcanizates. For a given silica content, the NR : SBR blend ratio of 1 : 1 (or 50 : 50 phr) exhibited the optimum mechanical properties for fly‐ash filled NR/SBR b…
Abstract The rectorite (REC), a form of layered silicate, was facilely intercalated and even exfoliated in soy protein isolate (SPI) matrix. Furthermore, the reinforced biodegradable nanocomposite sheets were produced, in which the exfoliated REC lamellae plays a key role. After solution‐mixing, XRD patterns showed th…
We consider far from equilibrium heat transport in chaotic billiard chains with noninteracting charged particles in the presence of nonuniform transverse magnetic field. If half of the chain is placed in a strong magnetic field, or if the strength of the magnetic field has a large gradient along the chain, heat curren…
Phase stability in $\ensuremath{\alpha}$- and $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{B}$ has been investigated by using first-principles quasiharmonic phonon calculations. It is found that the defect-free $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{B}$ is more stable than the defect-free $\ensuremath{\be…
We report on a study of various $R\mathrm{V}{\mathrm{O}}_{3}$ single-crystal samples ($R=\mathrm{La}$, Nd, Sm, Gd, Er, and Y) which show temperature-induced magnetization reversal. For compounds with lighter rare earths ($R=\mathrm{La}$, Nd, and Sm), magnetization reversal can be observed for a magnetic field applied…
A one-step electron-beam lithography process for the fabrication of a high-aspect ratio nanopin array is presented. Each nanopin is a metal-capped dielectric pillar upon a ring-shaped metallic disc. Highly tunable optical properties and the electromagnetic interplay between the metallic components were studied by expe…
Abstract In this study we explore the feasibility of using of islands‐in‐the‐sea (I/S) fibers in the spunbond process to produce relatively high strength micro‐ and nanofiber webs. The relationships between the number of islands, percent polymer composition, and the fiber and fabric properties are reported. Nylon 6 (N…