Materials Literature
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The iron(III)-substituted tungstogermanate [Fe6(OH)3(A-alpha-GeWO34(OH)3)2]11- (1) has been synthesized and characterized by IR, elemental analysis, SQUID magnetometry, electron paramagnetic resonance (EPR), and electrochemistry. Single-crystal X-ray analysis was carried out on Cs4Na7[Fe6(OH)3(A-alpha-GeW9O34(OH)3)2]…
CdTe quantum dots show increased quantum yields when incorporated into a temperature-sensitive poly(N-isopropylacrylamide) hydrogel (see Figure). The fluorescence intensities and maximum emission wavelengths are sensitive to external temperature stimuli and are completely reversible.
An ultrafast electrochromic display is fabricated based upon well defined nanotube arrays of poly(3,4-ethylenedioxythiophene), PEDOT (see Figure). The thin nature of the nanotube walls (10 – 20 nm) offers a short ion-diffusion distance, which results in an ultrafast switching rate (color-switching time < 10 ms). The a…
ZnO nanowires doped with a high concentration Ga, In, and Sn were synthesized via thermal evaporation. The doping content defined as X/(Zn + X) atomic ratio, where X is the doped element, is about 15% for all nanowires. The nanowires consist of single-crystalline wurtzite ZnO crystal, and the average diameter is 80 nm…
Nanoparticles strung on nanotubes, like a beaded necklace (see Figure), have been synthesized by a simple low temperature supercritical solution method. That the crystalline spherical Co3O4 nanoparticles on multiwalled carbon nanotubes are a step towards high-density integrated nanometer-scale functional devices is de…
Microspheres of wax containing embedded Grubbs' catalyst are generated by congealing a molten aqueous suspension. Even with a ten-fold reduction in catalyst concentration from previous systems, these microspheres produce unprecedented levels of toughness recovery in a polymeric self-healing material (see Figure). Unli…
Bacterial-cellulose nanofibers obtained from Acetobacter xylinum can reinforce polymer resins while maintaining the transparency of the original resin, even at fiber contents as high as 70 wt.-%, because the nanofibers do not appreciably scatter visible light. The flexible plastic composites (see Figure) reinforced wi…
During the growth of indium phosphide (InP) crystals, dislocations are mostly generated in a plastically deformed crystal due to crystallographic glide caused by excessive thermal stresses. High dislocation density presented in the InP crystal can reduce the performance, lifetime, and reliability of the InP-based micr…
Abstract The final morphology of cured blends based on unsaturated polyester, styrene, and low‐molar‐weight saturated polyester as a low profile additive (LPA) was investigated with atomic force microscopy and scanning electron microscopy. The observed structure was compared to those obtained with widely used poly(vin…
It is shown that if a single-negative (SNG) material layer is included between two parallel waveguides of a directional coupler, we can obtain such supermodes that the symmetric mode propagates faster than the antisymmetric mode for one polarization component of input waves while the antisymmetric mode travels faster…
An improved thick dielectric (TD) layer for inorganic electroluminescent (EL) display devices has been achieved through a composite high-/spl kappa/ dielectric sol-gel/powder route. This composite TD film results in a luminance improvement (up to 10/spl times/) in these TDEL devices with Eu-doped GaN and Mn-doped ZnS…
Abstract Carnosic acid and similar compounds exhibit antioxidant behavior in a polyethylene matrix. Thermal resistance of LDPE was investigated at three temperatures (190, 200, and 210°C) by isothermal chemiluminescence. The main kinetic parameters: oxidation induction period ( t i ), half oxidation time ( t 1/2 ), ma…
Abstract We studied the long‐term performance of new environmentally‐friendly blowing agents for polyurethane foams. Several blowing agents, hydrofluorocarbons, hydrocarbons, and a possible hydrochlorofluorocarbon substitute (dimethoxymethane), as well as hydrochlorofluorocarbons, were analyzed. The determination of e…
Abstract Based on Einstein's photoelectric principle, the absolute work function was measured with a special modified photoemission electron microscope. The work function of the sample was determined by measuring the threshold of the photoelectron emission. The wavelength of ultraviolet rays was swept with an energy r…
This letter demonstrates the use of catalyst nanoparticles prepared by ion implantation for growth of carbon nanotubes (CNTs) via chemical vapor deposition. Nickel ions of energy in 100keV were first implanted at room temperature into silicon dioxide to doses of 1015–1017cm−2. Postimplantation annealing was conducted…
We demonstrate spatially resolved polarization encoding of nonlinear information by all-optical poling of photoisomerizable and nonlinear molecules in polymer films. The second harmonic generation (SHG)polarization responses of the photo-induced patterns are imaged by a nonlinear microscope with 2 microm lateral resol…
Patterned electrodes on porous substrates, where the contacts to address these electrodes are hidden on the back of the substrates are described. To demonstrate the applicability of this method in fabricating organic electronic devices, a reflective-type polymer electrochromic device is constructed. A 7-pixel numerica…
Abstract Blends of polyamide 12 (PA12) with styrene/ethylene–butylene/styrene (SEBS) and maleic anhydride grafted SEBS (SEBS‐ g ‐MA) were prepared by twin‐screw extrusion and injection molding. The morphology, mechanical properties, and dynamic mechanical properties of the blends were studied. The morphology of the bl…
Abstract The kinetics of nonisothermal decomposition of (2‐phenyl‐1,3‐dioxolane‐4‐yl) methyl methacrylate (PDMMA), 2‐hydroxyethyl methacrylate (HEMA), and vinyl‐pyrrolidone (VPy) copolymers were investigated by thermogravimetry (TG) and differential thermal analysis (DTA). The data indicated that the major weight loss…
${\mathrm{Nd}}^{3+}$ ion crystal field excitations in ${\mathrm{NdMnO}}_{3}$ single crystals have been studied by infrared transmission as a function of temperature and under applied magnetic field. Lifting of the ground state Kramers doublet degeneracy $(\ensuremath{\sim}14\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\e…