Materials Literature
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The authors advance and examine a new mechanism which strongly influences the photoionisation processes above the 4d threshold in Xe and Ba. It is shown that the elastic and inelastic scattering of the inner-shell photoelectron by the outer-shell electrons determines the rate of single and double ionisation, decomposi…
In the authors' previous work data have been presented which indicate that thermoluminescence (TL) at 110 degrees C in crystalline quartz is due to the recombination of electrons released from (GeO 4 ) - centres with holes trapped at (AlO 4 ) 0 centres and at unidentified hole traps. In this paper new results are pres…
The antiferromagnetic structure of triclinic Cu 3 (PO 4 ) 2 (T N =22.2(5)K) has been determined at 2 K by unpolarised neutron diffraction from powdered and single-crystal samples prepared by hydrothermal synthesis. The triacute reduced chemical unit cell has a=4.855(1), b=5.288(1), c=6.184(1) AA, alpha =72.34(1), beta…
We demonstrate a fabrication process for making composite biological/solid-state heterostructures of nanometer dimension (nanoheterostructures). In this process individual protein molecules selectively self-assemble onto a 1.2-nm-thick Ta/W oxide film which has been patterned into a screen-like lattice with holes of 2…
The molecular dynamics with a first-principles interatomic potential is used to study the phase transition of quartz from the \ensuremath{\alpha} to \ensuremath{\beta} phase. The phase transition, successfully reproduced at about 850 K, is shown to have a peculiar dynamical character in that, although the probability…
The phonon structure of monolayer graphite formed on some transition-metal carbides has been investigated by using electron-energy-loss spectroscopy. The dispersion relations of the phonons in the monolayer graphite have indicated peculiar softening in intralayer chemical bonds and considerable bonding between the ove…
We report measurements of the valence- and core-level photoemission spectra of mass-selected, monodispersed Pt clusters. For individual samples consisting of the platinum atom through the six-atom cluster deposited onto a silica substrate, we have followed the development of the individual valence-band electronic stru…
Current issues and problems in the chemical vapor deposition (CVD) of diamond are those which relate to its characterization, its nucleation on foreign surfaces, the question of its formation in preference to the other phases of solid carbon (for example, graphite, chaoite, or lonsdaleite), why different morphologies…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental studies on the rheology of hard-sphere suspensions near the glass transitionLouise. Marshall and Charles F. ZukoskiCite this: J. Phys. Chem. 1990, 94, 3, 1164–1171Publication Date (Print):February 8, 1990Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure Raman and optical absorption studies on lead pyroniobate (Pb2Nb2O7) and pressure-induced phase transitionsA. Jayaraman, G. A. Kourouklis, A. S. Cooper, and G. P. EspinosaCite this: J. Phys. Chem. 1990, 94, 3, 1091–1094Publication Date (Print):February 8, 1990Pu…
One of the basic quantities characterising a system of interacting particles is the nearest-neighbour distribution function H(r). The authors give a general expression for H(r) for a distribution of D-dimensional spheres which interact with an arbitrary potential. Specific results for H(r) are obtained, for the first…
Abstract Since oxidizability of raw rubber is adversely affected by epoxidation, an attempt was made to bind an amine antioxidant to the rubber molecule through the oxirane group. Effective binding was observed only if the latex is neutralized before addition of the amine. Of the three amines used, 4‐amino‐ para ‐phen…
The one-dimensional Thue-Morse sequence with a generating matrix of determinant 0 has been suggested to be intermediate between a periodic structure and a standard quasi-periodic structure like the Fibonacci sequence. The renormalisation procedure developed in the authors' previous study of the one-dimensional Fibonac…
We have used x-ray photoelectron spectroscopy to measure the valence-band offset in situ for strained Si/Ge (100) heterojunctions grown by molecular beam epitaxy. Si 2p and Ge 3d core level to valence-band-edge binding energies and Si 2p to Ge 3d core level energy separations were measured as functions of strain, and…
Abstract The low temperature surface and bulk nitration of cellulose has been investigated by electron spectroscopy for chemical analysis (ESCA), 13 C‐NMR and X‐ray diffraction. Acid mix composition has been probed at room temperature and at low temperatures (0–20°C) by Raman spectroscopy. This multitechnique approach…
Abstract Studies on impact and tensile properties of binary blend of PP and ABS and ternary blend of PP, ABS, and LDPE are presented. Variation of impact strength and the fracture surface morphology with blend composition is examined and interpreted. Tensile behavior in the yield region is studied and the trends of va…
Abstract Neutron diffraction profiles for cellulose from different sources were compared before and after alkaline hydrogen peroxide (AHP) treatment. It was found that AHP treatment did not cause detectable changes in the structure of highly polymerized cellulose. In measurements on wheat straw, peaks were observed at…
Abstract Films of nylon 6, polypropylene, and ethylene–vinyl acetate copolymers were graft polymerized with acrylamide or dimethylacrylamide to render the hydrated surfaces slippery. Following UV irradiation in air, the films were placed in the aqueous monomer solution and then either heated to 50°C after degassing or…
Abstract Tensile property data for polystyrene samples of varying polydispersity are correlated with various parametric measures of molecular weight. Traditional measures of molecular weight, such as M̄ n , M̄ w , and M̄ z , are shown to be unable to account for the variation of tensile properties with molecular weigh…
Abstract Polystyrene (PS) and polyethylene (PE), along with their reactive counterparts, i.e., polystyrene having oxazoline reactive groups (OPS) and polyethylene with carboxylic acid groups (CPE), were melt blended in a Rheomix mixer. These blends were prepared by mixing these polymers in various proportions under a…