Materials Literature
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This study was devoted to the instrumented falling weight impact (IFWI) behavior of injection-molded a-and β-phase isotactic polypropylene (iPP) homopolymers. The perforation impact response of iPP with various melt flow indices (MFIs), and thus molecular weight (MW) characteristics, was studied at two different tempe…
We have studied the chemical and compositional modifications induced by 8 keV Ar° irradiation at the surface layers of ZrO2, SiO2, and ZrSiO4 (zircon). The surfaces were examined by in situ x-ray photoelectron spectroscopy (XPS). We have found that while pure SiO2 evolved to SiO1.95 and pure ZrO2 evolved to ZrO1.85, i…
Domain switching and rotation in soft lead zirconate titanate (PZT) ceramics were investigated in comparison with those in hard PZT ceramics by measuring the poling field dependence of the dielectric and piezoelectric properties. The minimum dielectric constant ( ε r ) and maximum frequency constant ( f c p ) were obs…
The structure of nylon 5,10 has been investigated using electron microscopy and X-ray diffraction. Nylon 5,10 shows polymorphism with two different structures related to the γ form obtained by either solution or melt crystallization. Packing differences may be attributed to a change in the hydrogen bonding system. In…
Fabrication of surface reliefs is achieved by raster scanning dry photopolymer films under a focused laser beam. The formation of the structure takes place subsequent to illumination without any chemical treatment or wet processing. Computer-generated optical elements can be recorded quickly, easily, and at low cost.…
The vacancy formation and migration enthalpies ${H}_{f}$ and ${H}_{m}$ in tantalum are calculated by means of ab initio pseudopotential techniques. The results obtained after relaxation with supercells containing 54 atomic sites ${(H}_{f}=3.0$ eV and ${H}_{m}=0.8$ eV) are in excellent agreement with experiments ${(H}_…
New sintered Sm-Co based permanent magnet materials have been developed to meet the high-temperature (/spl ges/400/spl deg/C) application requirement of advanced power systems. A magnet of Sm(Co/sub bal/Fe/sub 0.09/Cu/sub 0.09/Zr/sub 0.03/)/sub 7.69/ shows an intrinsic coercivity (/sub M/H/sub c/) approaching 13 kOe a…
Abstract 2-(2-Pyrrolylmethylidene)indolin-3-one (2) exhibited color change from reddish orange to greenish yellow giving the E isomer composition from 99% to 15% on irradiation at 366 nm and 546 nm, respectively.
The adsorption of polysaccharide guar gum and starch additives and their interactions with cellulosic fiber and fines, as well as soluble and colloidal carbohydrates, present in wood pulp suspensions were investigated by employing HPLC and spectrophotometry. A unique phenomenon, i.e. carbohydrate uptake or ‘substracti…
The structure and morphology of electrochemically deposited calcium carbonate have been investigated as a function of temperature, magnesium ion concentration, organic inhibitors, and deposition potential. At 25°C, microcrystals of calcite grew with their [104] planes parallel to the electrode surface. In the presence…
In recent years the author investigated the size and shape of linear and star-branched model chains as a function of functionality (number of arms) F and chain length (total number of beads) N for several lattice and off-lattice random walk models as well as for self-avoiding random walks (embedded in the tetrahedral…
Raman spectra were measured for lead zinc niobate-lead titanate solid solution 0.91Pb(Zn 1/3 Nb 2/3 )O 3 –0.09PbTiO 3 single crystals over a wide temperature range (-170–650°C) with different scattering geometry. Two phase changes were clearly observed by Raman scattering at the cubic to tetragonal ( T C–T ) and tetra…
Fully aliphatic polyimides (APIs) have been synthesized. APIs were prepared by poly(addition-condensation) of the alicyclic dianhydride bicyclo[2.2.2]octane-2, 3, 5, 6-tetra-carboxylic 2, 3:5, 6-dianhydride with the aliphatic diamine 5-amino-1, 3, 3-trimethylcyclo-hexanemethylamine, the mixture of 2, 5- and 2, 6-bis(a…
Inclusion complexes between beta-cyclodextrin derivatives and 1, 2-dithione-3-thiones were studied in aqueous solution and in the solid state. Phase solubility study was used to evaluate the complexation in solution, at 37 degrees C, of three cyclodextrins, i. e., beta-cyclodextrin (betaCD), hydroxypropyl-beta-cyclode…
Generic properties of elastic phonon transport at a disordered interface are studied. The results show that phonon transmittance is a strong function of frequency and the disorder correlation length. At frequencies lower than the van Hove singularity the transmittance at a given frequency increases as the correlation…
Phases of general formula ( RE , A ) 2 M 3 O 7 (RE=lanthanide, A=Ca, Sr, Ba; M=Ga, Al) are of interest for their nonlinear optical properties and have potential as solid state lasers. Their structures have been refined using X-ray and neutron diffraction data and are related to gehlenite, Ca 2 Al 2 SiO 7 , with M cati…
The properties of polyaniline (PANI) films, grown electrochemically on Au using the potential sweep method to two different upper potential limits (type I and II) to various thicknesses in sulfuric acid solution, were studied systematically using cyclic voltammetry, ac impedance, and for the first time, by tracking th…
Billets of hexagonal boron nitride powders ( h ‐BN) were hot‐pressed, varying the alignment of the platelike particles and the amount of oxide additives. Increasing either alignment of individual grains or the amount of additives was shown to increase flexural strength, to approximately 120 MPa at ambient temperatures…
In a large Czochralski-grown Si(1-x)Ge(x) (0.02 </= x </= 0.07) gradient crystal, diffraction patterns have been measured in symmetrical Laue geometry using synchrotron radiation in the energy range 100-200 keV. The experimental data are in very good agreement with the results from geometrical optics theory for distor…
Amycolatopsis sp. strain HT-6, a poly(tetramethylene succinate) (PTMS)-degrading actinomycete, was observed to degrade poly(tetramethylene carbonate) (PTMC). In a liquid culture with 150 mg of PTMC film, 59% degradation was achieved, but with a low yield of cell growth. On the other hand, PTMS copolymerized with a sma…