Materials Literature
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Alternate-current electroluminescent (ac EL) devices based on doped ZnS nanocrystals emitting blue, green, and orange-red colors are reported. ZnS nanocrystals doped with Cu+–Al3+ and Cu+–Al3+–Mn2+ combinations were synthesized by wet chemical method at room temperature. The ZnS:Cu+, Al3+ nanocrystals show blue (462 n…
Antimony-doped tin oxide (SnO2:Sb) thin films (100–480 nm thick) have been deposited by pulsed-laser deposition on glass substrates without a postdeposition anneal. The structural, electrical, and optical properties of these films have been investigated as a function of doping amount, substrate temperature, and oxygen…
The Heisenberg spin chain compound Sr3CuPtO6 is investigated by magnetic susceptibility and heat capacity measurements. Sr3CuPtO6 has an unconventional chain structure in the sense that i) the spin half copper atoms are arranged in a zigzag chain structure, and ii) neighboring Cu atoms along the chains are separated b…
A facile solution‐phase reaction has been developed to fabricate carbon nanotube/CdS core–shell nanowires (see Figure). The thickness of the CdS sheath can be controlled by varying the concentration of the precursors. The obtained heterostructures demonstrate an enhanced surface photovoltage response, which is associa…
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…