Materials Literature
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A new borohydride, [CH(3)NH(3)](+)[BH(4)](-), has been synthesized through the metathesis of CH(3)NH(3)F and NaBH(4) in methylamine. Room-temperature X-ray diffraction studies have shown that [CH(3)NH(3)](+)[BH(4)](-) adopts a tetragonal unit cell with considerable hydrogen mobility similar to that observed in NH(3)BH…
Abstract The evolution of the molecular weight distribution and the thermal, mechanical and fracture behaviour of controlled‐rheology ethylene‐propylene block copolymers ( ca 8 wt% ethylene content) has been analysed. Various concentrations of di‐ tert ‐butylperoxide were utilized. The melt flow index increased with t…
The nonisothermal crystallization process of polycaprolactone (PCL)/crosslinked carboxylated polyester resin (CPER) blends has been investigated for different blend concentrations by differential scanning calorimetry (DSC). The DSC measurements were carried out under different cooling rates namely: 1, 3, 5, 10, and 20…
Nanocomposites composed of SiO2 nanoparticles and a poly(butylene terephthalate) (PBT)/poly(ethylene terephthalate) (PET) binary blend were prepared by melt blending in a twin-screw extruder. The phase morphology, crystallization behavior, and transesterification of the nanocomposites were investigated by field emissi…
In this work we show that nematic liquid-crystal droplets can be used as low-loss and highly tunable whisperinggallery mode (WGM) optical microcavities. They are spontaneously formed by mixing the liquid crystal with an immiscible liquid. The optical modes can be tuned either by applying an electric field, changing th…
Abstract Mini‐emulsion polymerization of poly[styrene‐ co ‐(butyl acrylate)] encapsulating various contents of Cloisite 30B was performed. The kinetic behaviours of mini‐emulsions were investigated using the gravimetric method and the effect of nanoclay content on the polymerization rate was investigated. The average…
Abstract BACKGROUND: A central composite experimental design and multiple regression were used to model the production of pulp and paper sheets from a Paulownia fortunei × tormentosa × elongata trihybrid clone. Also, the same experiments were carried out with the solid phase after autohydrolysis of the raw material. R…
Extensive photophysical properties of isomeric tetra-2-pyridylporphyrin (TpyP(2)), tetra-3-pyridylporphyrin (TpyP(3)), and tetra-4-pyridylporphyrin (TpyP(4)) have been studied in the presence of a series of phenols of increasing hydrogen bonding power in dichloromethane solution by employing UV/vis spectroscopy; stead…
Density functional (Xα, BLYP, BPW91, B3LYP, and B3PW91), MP2, and coupled cluster with singles, doubles, and quasiperturbative triple excitations (CCSD(T)) methods in combination with LANL2DZ, cc-pVxZ, cc-pVxZ-PP, or cc-pVxZ-DK (where x = D (double), T (triple) Q (quadruple), and 5 (quintuple)) basis sets have been em…
We construct a density functional theory (DFT) for the sticky hard sphere (SHS) fluid which, like Rosenfeld's fundamental measure theory (FMT) for the hard sphere fluid [Y. Rosenfeld, Phys. Rev. Lett. 63, 980 (1989)], is based on a set of weighted densities and an exact result from scaled particle theory (SPT). It is…
This study evaluates the properties of the polymer composites obtained by melt blending castor oil-based polyurethane elastomer with agar polysaccharide. Films of the composite were prepared by blending polyurethane resin with agar (0— 12.5 wt%) and were characterized through analysis of their mechanical, dynamic-mech…
Widely shifting localized surface plasmon resonance (LSPR) bands of nanoporous metals is essential for light manipulation within small volumes. In this work, nanoporous gold-titania core-shells fabricated by atomic layer deposition exhibit tunable LSPR of gold skeletons in comparison with nanoporous gold-alumina devel…
To improve the toughness of polypropylene, two thermoplastic elastomers were blended with polypropylene separately. Tensile tests, impact tests, three point bending tests, thermal analysis and SEM analysis were performed. Tensile test results give an increase in energy at break which is the toughness of the material.…
Abstract In order to develop zein fibers with improved physical properties and solvent resistance, formaldehyde was used as a crosslinking reagent before spinning. The crosslinking reaction was carried out in either acetic acid or ethanolic HCl where the amount of crosslinking reagent was between 1 and 6%. Reactions w…
Density-functional theory calculations were performed to study the hydrogenation mechanism of Ti-doped NaH/Al, with emphasis on the role of NaH. Results from TiAl 3 H x ( x = 0−16) clusters showed that hydrogenation of TiAl 3 experienced a structural evolution in which TiAl 3 organizes into a distorted tetrahedral ske…
Examples of programmed tissue response after the interaction of cells with biomaterials are a hot topic in current dental research. We propose here the use of anodic porous alumina (APA) for the programming of cell growth in oral tissues. In particular, APA may trigger cell growth by the controlled release of specific…
Polysulfones with bulky phosphorus pendant groups, obtained by chemical modification of the chloromethylated polysulfones were subjected to rheological, surface tension and atomic force microscopy investigations, to establish the processing/morphology/property relationships of these polymers. The effects of the substi…
We examine influence of temperature on the phase behavior of dilute aqueous dispersions of charged colloidal silica and polystyrene particles. They undergo either freezing or melting transitions with increasing temperature. Freezing occurs in the case of low-charge, low-salt colloids, and melting is observed in the ca…
The superior optical performance of a sheet developed using microcellular foaming technology is demonstrated through the development and commercialization of a reflector. In this study, the cell morphology characteristics of reflectivity, transmittance, and haze were analyzed to develop diffusion sheet. A basic concep…
Extensive molecular simulations of the Lennard-Jones fluid are performed to examine the response of the excess chemical potential of cavitylike solutes to applied pressure. Solutes as large as ten times the solvent diameter are considered. The simulations are analyzed using the revised scaled-particle theory developed…