Materials Literature
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Photoluminescence (PL) and Fourier-transform infrared (FTIR) measurements have been performed on light-emitting porous silicon (LEPSi) after annealing at temperatures below 600 °C. Two different kinds of samples with different surface morphologies and different initial concentrations of chemically bonded hydrogen were…
Abstract The crazing behavior of coextruded microlayer sheets consisting of alternating layers of polycarbonate (PC) and styrene–acrylonitrile copolymer (SAN) was investigated as a function of PC and SAN layer thicknesses. In this study, the total sheet thickness remained essentially constant and the PC and SAN layer…
Hydrogen diffusion in ZrH x (1.58<or=x<or=1.98) in the temperature range 600 K to 970 K has been measured by means of pulsed-field-gradient nuclear magnetic resonance. The activation enthalpy for hydrogen diffusion, H a , obtained by fitting an Arrhenius expression D=D 0 exp(-H a /k B T) to the diffusivities, increase…
Abstract The ductility of a calcium carbonate‐filled amorphous copolyester PETG in a uniaxial tensite test was examined as a fiction other filler volume fraction. A ductile‐to‐quasibrittle transition occurred as the volume fraction of filler increased. This transition was from propragation of a stable neck through the…
Abstract Interfacially compatibilized immiscible blends with an isotactic polypropylene matrix (PP) and dispersed polyamide‐66 (PA) were prepared by extrusion with anhydride‐grafted isotactic PP compatibilizers, one of high‐anhydride content (HAC, 2.7 wt % grafted maleic anhydride) and one of low‐anhydride content (LA…
Abstract Two anydride‐grafted isotactic polypropylene (PP) compatibilizers, HAC or high‐anydride compatibilizer (2.7 wt % grafted maleic anhydride) and LAC or low‐anydride compatibilizer (0.2 wt % anydride), were compared in PP‐rich blends with polyamide‐66 (25 wt %). A previous article demonstrated that LAC imparted…
Evidence has recently accumulated that an interconnect under intense electric current can fail by a transgranular slit. A rounded void first forms, enlarges, and drifts. When the void becomes sufficiently large, a narrow slit emerges at the expense of the void, running across the linewidth. In this letter we describe…
Magnetotransport measurements have been carried out on the organic superconductor kappa -(BEDT-TTF) 2 Cu(NCS) 2 at temperatures down to 500 mK and in hydrostatic pressures up to 16.3 kbar. The observation of Shubnikov-de Haas and magnetic breakdown oscillations has allowed the pressure dependences of the area of the c…
We report a revision of the rigid-ion potential for UO 2 introduced by Sindzingre and Gillan (see ibid., vol. 21, p. 4017, 1988). In its original form, the potential is unstable at the reported lattice parameter. We have re-fitted the potential to remove this problem, whilst keeping as close as possible to the origina…
Abstract The effects of various filler characteristics on the ductility of filled amorphous copolyester, Kodar 6763, have been examined. The five fillers in the study included two calcium terephthalates with different particle‐size distributions and three calcium carbonates, also with different particle‐size distribut…
Based on density-functional theory we study the occurrence of a ferroelectric phase in Stockmayer fluids. Because of the long-ranged dipolar forces the corresponding bulk phase diagrams depend on both the shape of the sample and the character of the dielectric surrounding. For ellipsoidal samples with different aspect…
We studied the electro-optical response of a bistable cholesteric texture (BCT) display to ac voltage pulses. The material can be driven into states where planar and focal conic textures coexist at zero field and gray scale memory is achieved. According to the properties of the BCT display we designed two drive scheme…
The luminescence of the alkali halides doped with ns 2 ions is studied in a wide temperature region by the methods of time-resolved polarization spectroscopy with the use of magnetic and electric fields. It is established that the structure and properties of relaxed excited states (RES) of all the centers investigated…
Linked by strings of diphenylhexatriene (DPH) molecules, beta- and gamma-cyclodextrins (CDs) can form nanotube aggregates that contain as many as approximately 20 betaCDs (20 nanometers long) or approximately 20 to 35 gammaCDs (20 to 35 nanometers long). Nanotube formation was indicated in solution, by fluorescence an…
Novel artificial extracellular matrices were synthesized in the form of semi-interpenetrating polymer networks containing copolymers of poly(ethylene glycol) and acrylic acid (PEG-co-AA) grafted with synthetic bioadhesive peptides onto exposed carboxylic acid moieties. These substrates were very resistant to cell adhe…
Tissue-engineered implants require appropriate biomaterials to serve the required physical function of the tissue being repaired or replaced while facilitating remodeling of the implant. We report on the development of implantable fabrics manufactured from continuous collagen threads. The collagen threads are formed b…
Among the host of substratum properties that affect animal cell behavior, surface morphology has received relatively little attention. The earliest effect of surface morphology on animal cells was discovered almost a century ago when it was found that cells became oriented in response to the underlying topography. Thi…
Abstract Poly(acrylic acid) (PAAc) films were treated with either an argon or a tetrafluoromethane (CF 4 ) plasma and subsequently analyzed with X‐ray photoelectron spectroscopy (XPS). PAAc films were decarboxylated during both types of plasma treatments. In addition, during the CF 4 plasma treatment, the PAAc films b…
Abstract LDPE/PP polyblends, modified through either peroxide initiated reactions or irradiation, were characterized in terms of rheological and mechanical properties and microstructure. In the presence of peroxide, or through irradiation LDPE crosslinks, PP degrades. Data were obtained at two peroxide concentration l…
A method has been proposed for the determination of localized-state distributions in amorphous semiconductors from transient photoconductivity using Laplace transforms. The method is valid in both pre- and post-recombination regimes of transient photoconductivity. The applicability of the method is demonstrated in amo…