Materials Literature
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Abstract In order to improve the stretchability of linear low density polyethylene (LLDPE) for double bubble tubular film (DBTF), the blending of LLDPEs have been investigated. Three LLDPEs of varying densities were blended, and several films having different densities, molecular-weight distributions and composition d…
Nanodispersed metallic clusters of platinum and palladium were incorporated into NaX zeolite cavities by impregnation with acetone solution of corresponding acetylacetonates, solvent evaporation and acetylacetonate thermal decomposition. The acetylacetonate decomposition was followed by thermogravimetry. Modified zeol…
Crevice corrosion on Type 316L (UNS S31603) stainless steel in alkaline chloride solutions was studied by galvanostatic polarization of an occluded specimen with a polytetrafluoro-ethylene (PTFE) crevice former. It is shown that it is possible for crevice corrosion to propagate in such solutions, even at pH > 1…
Six related polyoxypregnane glycosides were isolated and characterised from Caralluma retrospiciens leaves. The compounds were identified as 12beta-benzoyloxy-8beta,14beta-dihydroxypregn-20-one-3-O-[3-O-methyl-6-deoxy-beta-D-allopyranosyl-(1 --> 4)-beta-D-cymaropyranosyl-(1 --> 4)-]-beta-D-cymaropyranoside], 12beta-be…
Abstract Summary: The effect of metal catalysts in promoting the formation of the comb copolymer between a very low density polyethylene (VLDPE) grafted with diethyl maleate and PET has been studied in this paper following a model study based on low molecular weight molecules resembling the local structure of the reac…
Adsorption behaviors of alkanethiol molecules are investigated on the surface of single-walled carbon nanotubes with vibrational spectrophotometer. Butanethiol (C4H9SH), hexanethiol (C6H13SH), nonanethiol (C9H20SH), and dodecanethiol (C12H25SH) molecules are adsorbed on the nanotube surface, and infrared spectra are m…
Dielectric spectra ɛ′(ν) and ɛ″(ν) of Ca1−x PbxTiO3 ceramic samples (x=0, 0.15, 0.2, 0.4) have been studied in the frequency range ν=7–1000 cm−1 at temperatures from 5 to 300 K using IR Fourier spectroscopy and submillimeter-range techniques. In the low-frequency range, polar phonons were established to undergo temper…
Ferroelectric properties of La 3+ -substituted bismuth titanate (BLT) films were modified by Ti-site substitution using higher-valence ions than the Ti 4+ ion. Thin films of V 5+ -, W 6+ -, Zr 4+ - and nonsubstituted BLT, i.e., (Bi 3.24 La 0.75 )(Ti 2.97 V 0.03 )O 12 (BLTV), (Bi 3.23 La 0.75 )(Ti 2.97 W 0.03 )O 12 (BL…
Electron transport properties of single-walled carbon nanotubes are investigated with TTF and TCNQ molecules, i.e., tetrathiafulvalene and 7,7,8,8-tetracyano-p-quinodimethane. TTF and TCNQ are well known strong charge transfer molecules. From the current–voltage measurement in a vacuum, current decreases and increases…
Abstract The crystal field parameter 10Dq [cm⁻¹] of octahedral chromium obtained as the energy of the 4 A 2g → 4 T 2g band of Cr 3+ in the electronic absorption spectra, EAS, of a series of 13 natural grossular-uvarovite garnets with compositions close to the binary join Ca 3 (Al 1– x Cr x ) 2 Si 3 O 12 , depend on th…
Morphologic characterization of polymers by scanning electron microscopy (SEM) is often made difficult by their sensitivity to electron beam damage. We describe here a specimen preparation method for the imaging of polymer blends by low-voltage SEM (LV-SEM) that improves their stability in the electron beam and hence…
The effects of incorporating yttrium aluminum garnet (YAG) into a porous alumina matrix reinforced with Nextel 610 alumina fibers were investigated. Composites with various amounts of YAG added to the matrix were prepared to determine its effect on retained tensile strengths after heating to 1100° and 1200°C. Strength…
Semiconductor micro and nanofabrication lithography techniques for application in microelectronics as well as in micromechanics and optoelectronics can gain significantly from using a dry resist process, since it enables the deposition of a very uniform lithographically sensitive layer on a potentially very small area…
Abstract Summary: Anisotropy in molecular motions of a glassy smectic CA (SmCA) liquid crystal of a main‐chain BB‐5(3‐Me) polyester was examined by dynamic mechanical analysis (DMA) for fibrous monodomain samples with two distinct orientations of smectic layers perpendicular and parallel to the fiber axis. The α ‐proc…
Abstract A carboxylated nitrile rubber (XNBR) and a carboxylated SBR (XSBR) were mixed with zinc oxide particles of different specific surface areas (“S”, 35 m 2 /g; “M”, 3.5m 2 /g; “L”, 0.5 m 2 /g) and cure behavior at 165 ºC studied using oscillating disc rheometry. Without added zinc oxide, both raw rubbers slowly…
Novel liquid crystal materials based on 1-alkyl-4-[5-(dodecylsulphanyl)-1,3,4-oxadiazol-2-yl]pyridinium and bearing bromide, alkyl sulphate or bis(2-ethylhexyl)sulphosuccinate counterions were prepared. Their thermotropic and thermochromic properties were characterized and compared. It was established that the majorit…
In a recent paper, we described similarities between the superionic transition in certain crystals and the glass transition in fragile, supercooled liquids. We now examine the underlying energy landscapes of the fluorides of lead(II) and calcium, by minimizing the potential energy from configurations along molecular-d…
Recently, two new CNTs-based triode structures, i.e., under-gate and planar-gate structures, for field emission display were proposed and exhibited good characteristics. In this paper, we will investigate how the current density distributed on anode plate and how the display’s resolution affected by the bias condition…
The technical feasibility of using a suitable sorbent for the removal of some heavy metal ions from their aqueous solutions was investigated. The scope of the work covers the use of low-class native wool or wool wastes from industrial processes or from recycled woolen textiles for the removal of copper, nickel, cobalt…
A solution is presented for the fabrication of low-voltage, low-power (<4.25 V and <5 mW) silicon light-emitting devices (Si-LEDs), utilizing standard very large scale integration technology without any adaptation. Accordingly, they can be integrated with their signal processing CMOS and BiCMOS circuits on the same ch…