Materials Literature
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Abstract Test bars (3 mm thick) made from a high‐density polyethylene (HDPE), a low‐density polyethylene (LDPE), and a linear low‐density polyethylene (LLDPE) were injection‐molded from virgin polymer and from blends containing recycled photodegraded polymer of the same kind. The molded bars were then subjected to ult…
High‐temperature Young's modulus of a partially sintered alumina ceramic has been studied dynamically during the sintering process. Comparative, room‐temperature Young's modulus data were obtained for a suite of partially sintered alumina compacts with different porosities. The dynamic Young's modulus of a 1200°C part…
Abstract Enzymatic synthesis of a water‐soluble, conducting polyaniline (PANI) was studied, using horseradish peroxidase as the biocatalyst and H 2 O 2 as the initiator, in the presence of a poly(vinylsulfonic acid, sodium salt) (PVS) polyanion template. The effects of the buffer, concentration of H 2 O 2 , and the mo…
Abstract Membranes were prepared by the direct and isothermal immersion of polyamide solutions in a formic acid/water bath. A crystalline polycaprolactam homopolymer, nylon 6, and a largely amorphous terpolymer of nylon 6, nylon 66, and nylon 610 were precipitated from solutions to form complex morphologies on the top…
Abstract Nano‐sized calcium carbonate was pretreated with silane coupling agent and then mixed with butyl acrylate that is of larger amount than the nanoparticles. Under γ‐irradiation, graft polymerization occurred on the nanoparticle surface, forming a nanocomposite structure consisting of grafted poly(butyl acrylate…
Three-dimensional plasma enhanced chemical vapor deposition (CVD) of hydrogenated amorphous carbon (a-C:H) has been demonstrated using a new type high-density volumetric plasma source with multiple low-inductance antenna system. The plasma density in the volume of phi 200 mm x 100 mm is 5.1 x 10(10) cm(-3) within +/-5…
We study the role of fluctuations in single molecule experimental measurements of force-extension (f-zeta) curves. We use the worm-like chain (WLC) model to bring out the connection between the Helmholtz ensemble characterized by the free energy [F(zeta)] and the Gibbs ensemble characterized by the free energy [G(f)]…
We describe a simulation method to design surfaces for recognizing specific monomer sequences in copolymers. We fix the monomer sequence statistics of the AB copolymers on a surface containing two types of sites and allow the simulation to iterate towards an optimal surface pattern that can recognize and selectively a…
Cystatins are natural inhibitors of papain-like (family C1) and legumain-related (family C13) cysteine peptidases. Cystatin D is a type 2 cystatin, a secreted inhibitor found in human saliva and tear fluid. Compared with its homologues, cystatin D presents an unusual inhibition profile with a preferential inhibition c…
Abstract Undoped and yttrium doped zinc oxide thin films have been deposited on corning glass by dip coating technique. The effect of doping (0–4 wt%) and annealing temperature (300–500 °C) on the structural, optical and electrical properties of the produced films have been investigated. All the films show polycrystal…
The d electron orbital is a hidden but important degree of freedom controlling novel properties of transition-metal oxides. A one-dimensional orbital system is especially intriguing due to its enhanced quantum fluctuation. We present a combined experimental and theoretical study on the Raman scattering spectra in pero…
High-quality crack-free mesoporous titania thin films on silicon wafers or glass slides by spin-coating method. The thermal stability of these crystalline films can be remarkably enthanced, up to 850 °C, by post-treatment of the film in supercritical carbon dioxide with the presence of a small amount of tetramethoxysi…
Temperature-dependent dielectric and electro-optic properties of a ZnO-BaTiO3-ZnO heterostructure grown by pulsed-laser deposition on (0001) sapphire are reported. The wurtzite-structure ZnO layers serve as transparent conducting electrodes. Previously observed coupling effects within the wurtzite-perovskite heterostr…
A photocrosslinkable polymer liquid crystal (PPLC) can be used to form aligned mesoporous silica thin films. Crosslinking the biphenyl mesogens with linearly polarized UV light results in a photo-oriented film whose orientational order is subsequently increased by annealing. Addition of a precursor sol produces high-q…
A recently proposed schematic model for the nonlinear rheology of dense colloidal dispersions is compared to flow curves measured in suspensions that consist of thermosensitive particles. The volume fraction of this purely repulsive model system can be adjusted by changing temperature. Hence, high volume fractions (ph…
Abstract Electroinitiated polymerization of carbazole was achieved in acetonitrile by direct electron transfer via constant potential electrolysis based on anodic peak potentials. The anodic peak potential of carbazole was determined by cyclic voltammetry to be + 1.4V. It has been observed that polymer yield increased…
Abstract X‐ray photoelectron spectroscopy was used to study the chemical composition and electronic structure of the Y 3 Al 5 O 12 :Yb (YAG:Yb) crystals. The contamination of the crystal with carbon and oxygen in the broken under UHV sample was found. The dopant concentration of Yb, in the mixed valence state, was det…
Abstract This paper reports the fatigue behavior of an injection molded 40wt% talc‐filled polypropylene. The effects of specimen orientation relative to the flow direction, weld line, hole stress concentration and test frequency on the fatigue performance of this material have been considered. The fatigue strength in…
Abstract The reaction between unsaturated polyester (UP) resin and styrene (St) is a heterogeneous free‐radical chain‐growth cross‐linking copolymerization. Curing of the UP/St system in the presence of organically‐modified nanoclay was studied by differential scanning calorimetry (DSC) and Fourier transform infrared…
In this paper we present measurements of the crystallization kinetics of binary mixtures of two different sized hard sphere particles. The growth of the Bragg reflections over time were analyzed to yield the crystallite scattering vector, the total amount of crystal, and the average linear crystal size. It was observe…