Materials Literature
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Wave propagation in coherently absorbing disordered media is generally modeled by adding a complex part to the real part of the potential. In such a case, it is already understood that the complex potential plays a duel role; it acts as an absorber as well as a reflector due to the mismatch of the phase of the real an…
Dielectric permittivity measurements show that (1-x)NaNbO3-(x)Gd1/3NbO3 crystals, at $x=0.09$, exhibit a first order phase transition near 150 C which is diffuse over a wide temperature interval. The area of the ε(T) thermal hysteresis loop was found to depend both on the annealing and cooling temperatures. Optical st…
We have investigated the effects of oxygen plasma treatment on the UV detection properties of ultrathin (∼20-nm-thick) ZnO epitaxial films. Highly epitaxial ZnO films grown on sapphire were exposed to oxygen-radical-rich, inductively coupled plasma, and then their UV detection properties were characterized at 325 nm w…
Electrospun nanofibers of polyacrylonitrile , containing an iron compound, have been converted to carbon nanofibers, with iron particles on their surfaces. The iron particles catalyze the growth of carbon nanotubes with iron tips (see Figure). A mechanically strong and electrically conducting path exists between each…
Polyacrylonitrile (PAN) fibers containing 10 wt.‐% single‐walled carbon nanotubes (SWNTs) exhibit a 100 % improvement in tensile modulus and reduced thermal shrinkage and polymer solubility. A 40 °C increase in glass transition temperature as compared to the control PAN fiber is also observed (see Figure). SWNT anisot…
Electroluminescent (EL) devices (see Figure) have been fabricated using n‐ZnO nanorod arrays grown on p‐GaN epilayers. Simple heteroepitaxial growth yields vertically aligned ZnO nanorods with an abrupt interface on GaN. The p–n heterojunction EL device shows a high current density and strong electroluminescence even…
Bentonite filler was treated with different surface modifiers such as cetyl trimethyl ammonium bromide (CTAB), polyoxyethylene sorbitan monooleate (Tween 60), and compared with oleic acid. Polypropylene (PP) composites were prepared by blending with untreated and treated bentonite. The mechanical properties of the pre…
The effect of various degradations on the tensile and morphological properties of polypropylene (PP)/natural rubber (NR) and PP/recycle rubber (RR) blends at different rubber content were studied. The blends were melt mixed using a Brabender Plasticorder torque rheometer at 190°C and 50 rpm. All blends were exposed at…
A series of ternary blends of polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM)/natural rubber (NR) and PP/EPDM/epoxidized natural rubber (ENR25) were prepared in a laboratory internal mixer at 180°C and a rotor speed of 50 rpm. The mechanical properties, oil resistance, and morphological studies of PP/EPD…
Abstract A significant amount of industrial and governmental research has been and today is being conducted on nanocomposites. The most popular polymers for research and development of nanocomposites are polyamides, polypropylene, polyethylene, styrenics, vinyls, polycarbonates, epoxies, acrylics, polybutylene terepht…
Molecular motion at the specific sites of polystyrene- block -poly(methyl acrylate) (PS- block -PMA) forming a lamellar morphology was studied by electron spin resonance (ESR). PS- block -PMA's having nearly the same molecular weight and composition were selectively spin-labeled with stable nitroxide radicals at diffe…
A new approach for the surface grafting of polymer chains to colloidal substrates is described. A cationic macroinitiator has been designed for the surface polymerization of a wide range ofhydrophilic methacrylates from ultrafine inorganic oxide sols by atom transfer radical polymerization in protic media at ambient t…
We measure Young's modulus of a free polyelectrolyte multilayer film by studying osmotically induced swelling of polyelectrolyte multilayer microcapsules filled with the polyelectrolyte solution. Different filling techniques and core templates were used for the capsule preparation. Varying the concentration of the pol…
2,3,5,6-Tetrafluoro-4-(2,2,3,3,3-pentafluoropropoxy)styrene (TF(F 5 )S) and 2,3,5,6-tetrafluoro-4-(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctaoxy)styrene (TF(F 15 )S) are prepared by nucleophilic substitution of 2,3,4,5,6-pentafluorostyrene. The neat monomers are subjected to atom transfer radical polymerization…
A rare asymmetric end-on double azido-bridged copper(II) complex has been synthesized and characterized structurally and magnetically. The Cu-N(azide)-Cu angle in this complex is calculated to be 89.1 degrees. This is unusually low in comparison to the same angle in other end-on azido-bridged binuclear complexes repor…
Thioalkyl and thioalkylated oligo(ethylene glycol) (OEG) ligands with chain-end functionality were used to fabricate water-soluble CdSe nanoparticle scaffolds. Surface recognition of chymotrypsin (ChT) was achieved using these functionalized nanoparticle scaffolds, with three levels of interaction demonstrated: no int…
We report a new fabrication approach to highly sensitive optical sensors by combining the techniques of electrospinning and electrostatic layer-by-layer adsorption. A fluorescent probe, hydrolyzed poly[2-(3-thienyl) ethanol butoxy carbonyl-methyl urethane] (H-PURET), was electrostatically assembled onto the surface of…
Abstract Semi‐interpenetrating polymer networks (IPNs) have been prepared from polyurethane anionomers and poly(vinyl chloride) using sequential polymerization technique. These IPNs were compression molded and obtained as tough films. The hydrogen bonding interaction, glass transition temperature, and thermal stabilit…
Abstract Anionic polymerization of lauryl methacrylate (LMA) with 1,1‐diphenylhexyl lithium in tetrahydrofuran (THF) at −40 °C resulted in a multimodal and broad molecular weight distribution (MWD) with poor initiator efficiency. In the presence of additives such as dilithium salt of triethylene glycol (G 3 Li 2 ), Li…
The methods of hydrochloric acid extraction, liquid–solid adsorption, and complexation were used to remove basic nitrogen compounds from gasoline, and the efficiencies of three removal methods were studied. The experimental results show that the optimum range of the concentration of hydrochloric acid is 0.05 ∼ 1.0 mol…