Materials Literature
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Single-crystalline nanoribbons were used as substrates for the epitaxial growth of different functional thin films deposited by laser ablation techniques. This simple method yields highly crystalline bilayer nanotapes with sharp structural and compositional interfaces. As an example, Co 0.05 Ti 0.95 O 2 @SnO 2 nanotap…
Epitaxial ${\mathrm{C}\mathrm{u}}_{2}\mathrm{O}$ islands on a Cu(100) surface formed through oxidizing Cu(100) films at 600 \ifmmode^\circ\else\textdegree\fi{}C in an ultrahigh vacuum transmission electron microscope were observed to undergo a shape transition from initially square shaped islands to elongated islands…
A combination of static and dynamic laser light-scattering techniques was employed to study the supramolecular structures of polyoxomolybdate-based giant molecules in aqueous solution. Convincing evidences indicate that the spherical aggregates have unique vesicle-like structures. A model is built up based on solid ex…
Planned nanopatterns of [Au 55 (Ph 2 PC 6 H 4 SO 3 Na) 12 Cl 6 ] clusters are generated on smooth silicon surfaces using a “bottom-up” fabrication methodology based on the selective self-assembly of the gold clusters on purpose-designed organic template patterns themselves fabricated via a hierarchical layer-by-layer…
A reinvestigation of the O-terminated, polar surface of zinc oxide, O-ZnO(0001\ifmmode\bar\else\textasciimacron\fi{}), using scattering of thermal energy He atoms reveals the presence of a (1\ifmmode\times\else\texttimes\fi{}3) reconstruction for the clean surface. This finding is at variance with the results of previ…
Oxidised, multi-walled, carbon nanotubes can be grafted with polystyrene molecules using an situ radical polymerisation reaction, thereby dramatically modifying their solubility and their suitability for nanocomposite applications.
Two anhydrous crystal structures of fully dehydrated Cd2+ - and Cs+ -exchanged zeolite X, Cd32Cs28Si100Al92O384 (Cd32Cs28-X: a = 24.828(11) <TEX>$\AA)$</TEX> and fully dehydrated Cd,sup>2+ - and Rb+ -exchanged zeolite X, Cd28Rb36Si100Al92O384 (Cd28Rb36-X: a = 24.794(2) <TEX>$\AA$</TEX>), have been determined by single…
Abstract Gelatin/montmorillonite (MMT) hybrid nanocomposite was directly prepared with unmodified MMT and gelatin aqueous solution. Thermal and mechanical properties of the composite were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and…
Using gradient-corrected, full-potential, density-functional calculations, including structural relaxations, it is found that the metal hydrides $RT{\mathrm{I}\mathrm{n}\mathrm{H}}_{1.333}$ ($R=\mathrm{L}\mathrm{a}$, Ce, Pr, or Nd; $T=\text{ }\text{ }\mathrm{N}\mathrm{i}$, Pd, or Pt) possess unusually short H-H separa…
Gallium metallic photonic crystals with 100% filling factor have been fabricated via infiltration of liquid gallium into opals of 300-nm silica spheres using a novel high pressure-high temperature technique. The electrical resistance of the Ga-opal crystals was measured at temperatures from 10 to 280 K. The data obtai…
Using an adiabatic approximation method, which searches for Tomlinson model-like instabilities for a simple but still realistic model for two crystalline surfaces in the extremely light contact limit, with mobile molecules present at the interface, sliding relative to each other, we are able to account for the virtual…
Transmission-electron microscopy has shown that the strongly piezoelectric material ${\mathrm{PbZr}}_{0.52}{\mathrm{Ti}}_{0.48}{\mathrm{O}}_{3}$ separates into two phases at low temperatures. The majority phase is the monoclinic phase previously found by x-ray diffraction. The minority phase, with a nanoscale coherenc…
We propose a scheme for numerically computing collective-mode spectra for large-size systems, using a reformulation of the random-phase approximation. In this study, we apply this method to investigate the spectrum and nature of the spin-waves of a (III,Mn)V diluted magnetic semiconductor. We use an impurity band pict…
Electronic States of Si and Ge QDs of 5 to 3127 atoms with saturated shapes in a size range of 0.57 to 4.92 nm for Si and 0.60 to 5.13 nm for Ge are calculated by using an empirical tight binding model combined with the irreducible representations of the group theory. The results are compared with those of Si and Ge q…
The ferromagnetic structure of ${\mathrm{BiMnO}}_{3},$ ${T}_{c}=105 \mathrm{K},$ has been determined from powder neutron-diffraction data collected at 20 K on a sample synthesized at high pressures using a cubic anvil press. ${\mathrm{BiMnO}}_{3}$ is a distorted perovskite that crystallizes in the monoclinic space gro…
Thin films of the vanadium oxides, V2O5, VO2, VOx (x = 2.00–2.50) and V6O13 were prepared on glass substrates by atmospheric pressure chemical vapour deposition (APCVD) of vanadium tetrachloride and water at 400–550 °C. The specific phase deposited was found to be dependent on the substrate temperature and the reagent…
The isometric pyrochlore structure, ${A}_{2}{B}_{2}{\mathrm{O}}_{7},$ is generally susceptible to radiation damage, but certain compositions are remarkably resistant to radiation damage. In the binary system ${\mathrm{Gd}}_{2}({\mathrm{Ti}}_{2\ensuremath{-}x}{\mathrm{Zr}}_{x}){\mathrm{O}}_{7},$ the radiation resistanc…
Honeycomb-like aligned carbon nanotube films were grown by pyrolysis of iron phthalocyanine. The patterned structure was characterized by a scanning electron micrograph (SEM) and an atomic force micrograph (AFM). Wettability studies revealed the film surface showed a super-hydrophobic property with much higher contact…
In the mid-1970s, surface-enhanced Raman scattering (SERS) was discovered which impacted on surface science and spectroscopy because of its extremely high surface sensitivity. However, SERS had not developed as many people had hoped to be a powerful surface diagnostic technique that can be widely used because of some…
In this paper we investigate the effect of hydrostatic pressure on the electrical conductivity of polypyrrole-polyaniline conductive (protonated) blends of various compositions. Results are presented for thermally aged blends as well. The modification of the conductivity due to pressure is more pronounced in the fresh…