Materials Literature
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Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields (>55 T). We show that the peak separation is determined by the Aharonov-Bohm phase due to the tube-threading magnetic flux, which breaks the time-reversal symmetry an…
We analyze correlations in step-edge fluctuations using the Bortz-Kalos-Lebowitz kinetic Monte Carlo algorithm, with a 2-parameter expression for energy barriers, and compare with our VT-STM line-scan experiments on spiral steps on Pb(111). The scaling of the correlation times gives a dynamic exponent confirming the e…
The effects of ion beam induced atomic mixing and subsequent thermal treatment in Si/C multilayer structures are investigated by use of the technique of grazing incidence X-ray diffraction (GIXRD) and Raman spectroscopy. The [Si (3.0 nm) / C (2.5 nm)]x10 /Si multilayer films were prepared by electron beam evaporation…
Ab initio approaches are introduced for calculations of inelastic losses and vibrational damping in core level x-ray and electron spectroscopies. From the dielectric response function we obtain system-dependent self-energies, inelastic mean free paths, and losses due to multiple-electron excitations, while from the dy…
The emission spectra of many pi-conjugated polymers and oligomers contain side-band replicas with apparent frequencies that do not match the Raman active mode frequencies. Using a time dependent model we show that in such many mode systems, the increased damping of the time dependent transition dipole moment correlati…
We report a simple method that uses proteins to solubilize single-walled carbon nanotubes (SWNTs) in water. Characterization by a variety of complementary techniques including UV-Vis spectroscopy, Raman spectroscopy, and atomic force microscopy confirmed the dispersion at the individual nanotube level. A variety of pr…
The crystal and magnetic structures of polycrystalline BiCoO 3 have been determined by the Rietveld method from neutron diffraction data measured at temperatures from 5 to 520 K. BiCoO 3 (space group P 4 mm; Z = 1; a = 3.72937(7) Å and c = 4.72382(15) Å at room temperature; tetragonality c / a = 1.267) is isotypic wit…
Lanthanide ions are supposed to be promising candidates for the elements of single-molecule magnets (SMMs) because of the large magnetic momentum and anisotropy. We have established the [Dy2Cu] complex as a new SMM. A plausible mechanism for quantum tunneling of magnetization is proposed for the first time among the 4…
Interest in the smectic liquid-crystalline state of matter received a substantial boost with the discovery by Meyer in the mid-1970s that a chiral smectic C (SmC*) phase exhibits a spontaneous electric polarization, and with the subsequent demonstration by Clark and Lagerwall of the surface-stabilized SmC* ferroelectr…
To properly assign mechanisms or causes for toxic effects of nanoscale materials, their properties and characteristics both outside and within the biological environment must be well understood. Scientists have many tools for studying the size, shape, and surface properties of particulates outside of the physiological…
Variable optical attenuators based on nematic liquid-crystal cells are considered. The attenuation curves of variable optical attenuators based on the 90° twisted and the parallel-aligned liquid-crystal cells are analysed explicitly with an approximate model, and the electro-optical behaviours of parallel-aligned liqu…
Large-scale molecular dynamics simulations are applied to study the sliding friction of amorphous silicon carbide on amorphous silicon carbide, amorphous silicon carbide on diamond, nano–crystalline silicon carbide on diamond, and crystalline silicon on diamond systems. The friction coefficient and structural evolutio…
Carbon nanofibres (CNFs) of controlled diameter and length were grown on different metal substrates using plasma-enhanced chemical vapour deposition (PECVD). The diameter control of catalyst dots (and hence CNF diameter) was obtained by using the shot modulation technique in electron beam lithography. Catalyst dots of…
This paper describes a nanoporous substrate for applications in biomedical diagnostics. A photolithographic microstructuring technique for an ordered nanopore array fabrication is reported. The process uses a negative resist with hydrophobic properties increasing specificity to biomolecule linking. Nanoporous alumina…
Abstract Shape memory behaviors of trans ‐polyisoprene (TPI) segmented urethane copolymers were studied. Film specimens for cyclic loading tests were prepared from the polymer solution by casting, and tested at the loading temperature of 65°C. Results show that the recovery rates of the films depend on their TPI segme…
The possibility of selectively assembling three-dimensional structures along bundles of single-walled carbon nanotubes (SWCNTs) will pave the way to using SWCNTs as nanoconducting templates that can spontaneously integrate into a conductive probe or pathway in a nano device. In the past 2 years, ZnO microcages have at…
This paper reports the results of an investigation into the stability of an individual multi-walled carbon nanotube subjected to combined bending and axial compression loading. The effect of van der Waals forces between two adjacent tubes is taken into account and a multiple-shell model is adopted. According to the ra…
Highly porous layered inorganic-inorganic nanohybrids were prepared by pillaring SiO2-TiO2 nanosol particles with aluminosilicate layers. According to powder X-ray diffraction analysis, the basal spacing of SiO2-TiO2 pillared aluminosilicate (STPC) calcined at 400 degrees C was determined to be larger than 40 A. N2 ad…
Abstract The effects of reactive poly(methyl methacrylate) (PMMA) and poly(vinyl acetate)‐ block ‐poly(methyl methacrylate) (PVAc‐ b ‐PMMA) as low‐profile additives (LPAs) on the glass‐transition temperature and mechanical properties of low‐shrink unsaturated polyester resin (UP) were investigated by an integrated app…
Anodic decomposition of a phenylmagnesium halide at a surface-hydrogenated silicon electrode leads to formation of polymeric layers covalently anchored to the silicon surface. These layers have been characterized using spectroellipsometry, photoluminescence, infrared, and X-ray photoelectron spectroscopies. The phenyl…