Materials Literature
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Pressure-induced structural, electronic, and thermodynamic changes in $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Al}{\mathrm{H}}_{3}$ were investigated using synchrotron x-ray powder diffraction and density-functional theory. No first-order structural transitions were observed up to $7\phantom{\rule{0.3em}{0ex}}…
Abstract This study addresses the issue of using recycled materials to obtain low‐cost structural products for practical applications. Through the use and re‐extrusion of virgin high‐density polyethylene (HDPE), the effects of the degradation level of HDPE as a matrix phase on its mechanical properties and the mechani…
Pressure-sized clusters: Aqueous solutions of rhodium complexes stabilized by phosphinophosphonic acid ligands turn ink-black under a hydrogen atmosphere. Depending on the hydrogen pressure applied, rhodium clusters of 2–6 nm can be isolated (see scheme). These clusters are catalysts for the biphasic hydrogenation of…
Abstract A series of hydrogenated natural rubbers, HNRs, were prepared by homogenous hydrogenation using H 2 gas with a rhodium catalyst (chlorotris(triphenylphosphine)rhodium) in toluene. The HNRs were linear polymers with molecular weights greater than 800,000. These rubbers were vulcanized using sulfur and peroxide…
Abstract In the previous work (S. Kiantash, MS Thesis, Amirkabir University of Technology, Textile Engineering Department, Tehran, Iran, 2002), the possibility of producing filament yarns from used PET bottles was investigated and the production was successfully carried out. To improve physical properties and to have…
Abstract Electrospinning is a simple but powerful method for making nanofibers that can then be collected to create porous mats. We expand the range of this technique by making nanofibers from macromolecules with a molecular weight of 3,000,000, namely poly(ethylene oxide) (PEO). Gelation of PEO blocks its spinning by…
Abstract The flame retardancy of low‐density polyethylene (LDPE) treated with complex flame retardant composed of ultrafine zinc borate (UZB) and intumescent flame retardant (IFR) have been investigated by limited oxygen index (LOI), UL‐94 test, thermogravimetric analysis (TGA), cone calorimeter test, scanning electro…
Zwiebelförmige Hybridaggregate von tensidverkapselten Polyoxometallaten wurden durch Selbstorganisation in organischer Lösung erhalten (siehe TEM-Bild von (DODA)4SiW12O40; DODA=Dimethyldioctadecylammonium). Die Hybridstruktur resultiert aus der von hydrophoben Wechselwirkungen getriebenen Umlagerung von Tensiden am Po…
Abstract The surface and pore structure of cellulose fibers have a significant impact on the properties and performance in applications. Cellulase enzymatic hydrolysis of cellulose fibers can result in changes to the surface and pore structure, thus providing a useful tool for fiber modification. This research charact…
We use confocal microscopy to visualize individual particles near the colloidal glass transition. We identify the most slowly-relaxing particles and show that they form spatially correlated clusters that percolate across the sample. In supercooled fluids, the largest cluster spans the system on short time scales but b…
Abstract Conducting polyaniline (PANI)/titanium dioxide (TiO 2 ) composite nanofibres with an average diameter of 80–100 nm were prepared by one‐step in situ polymerization method in the presence of anatase nano‐TiO 2 particles, and were characterized via Fourier‐transform infrared spectra, UV/vis spectra, wide‐angle…
Abstract This study is focused on aligning carbon nanotubes in polypropylene matrix by melt spinning. Two different weight percentages (0.5% and 1.0%) of nanotubes were used for the synthesis of the nanocomposite fibers. The effect of the nanotubes on the crystallization and mechanical behavior of polypropylene as wel…
Abstract In the present work, PP‐based composites, reinforced with surface modified pine fibers, have been prepared. The surface of the fibers has been treated with several silane derivatives bearing specific functionalities. NH 2 , SH, long aliphatic chain, and methacrylic group were chosen as functionalities of th…
Abstract Porous membranes and dense films were prepared from polysulfone solutions in N ‐methyl‐2‐pyrrolidone (NMP) containing different types and amounts of clay. Commercial clays supplied by Southern Clay, either unmodified (Cloisite Na) or organically modified (Cloisite 30B and Cloisite 93A), were used. The clay be…
In the past decade, the temperature-responsive behavior of poly(N-isopropyl acrylamide) (pNIPAM) has come to be recognized as a convenient method for the nondestructive harvest of confluent cell layers. Recently, we have utilized this nondestructive cell harvest method as a means to ascertain the nature of the extrace…
We present an investigation of the phase diagram of cholesteric liquid crystals within the framework of Landau-de Gennes theory. The free energy is modified to incorporate all three Frank elastic constants and to allow for a temperature dependent pitch in the cholesteric phase. It is found that the region of stability…
We report on both experimental and theoretical study of conduction-electron spin polarization dynamics achieved by pulsed optical pumping at room temperature in GaAs(1-x)N(x) alloys with a small nitrogen content (x = 2.1, 2.7, 3.4%). It is found that the photoluminescence circular polarization determined by the mean s…
We report a negative magnetocaloric effect in ${\mathrm{CoMnSi}}_{1\ensuremath{-}x}{\mathrm{Ge}}_{x}$ arising from a metamagnetic magnetoelastic transition. The effect is of relevance to magnetic refrigeration over a wide range of temperature, including room temperature. In addition we report a very high shift in the…
We have calculated the conduction-to-conduction and valence-to-valence absorption spectrum of bound states in (In,Ga)As/GaAs quantum dots charged with up to three electrons or holes. Several features emerge: (i) In pure (non-alloyed) InAs/GaAs dots, the 1S-1P_1 and 1S-1P_2 conduction intraband transitions are fully in…
Abstract Electrospinning is a relatively simple method to produce submicron fibers from solutions of different polymers and polymer blends. If the solution is absolutely insulating, or the applied voltage is not high enough that electrostatic force cannot overcome the surface tension, then no fiber can be produced by…