Materials Literature
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The chemical stability of electrochemically alkylated porous silicon is studied. The hydride-terminated surface of p-type or p ++ -type porous silicon is stabilized by electrochemical reduction of organohalides in acetonitrile solutions. Reduction of 6-iodo-ethylhexanoate, 1-iodo-6-(trifluoroacetylamino)hexane, iodome…
We report a template-based in-situ electrochemical method for fabricating natural electric contacts on single nanowires using a pair of cross-patterned electrodes. Such electric contacts are highly stable upon thermal cycling between room temperature and milli-Kelvin temperatures. Direct imaging of the single-nanowire…
We present a simple and pedagogical derivation of the spin current as the linear response to an external electric field for both Rashba and Luttinger spin-orbital coupling Hamiltonians. Except for the adiabatic approximation, our derivation is exact to the linear order of the electric field for both models. The spin c…
The weak-chemisorption/charge-transfer picture for adsorption of aromatic molecules over carbon nanotubes, proposed in the commented paper, is criticized.
In this work we use multiple scattering in conjunction with a genetic algorithm to reliably determine the optimized photonic-crystal-based structure able to perform a specific optical task. The genetic algorithm operates on a population of candidate structures to produce new candidates with better performance in an it…
We report the results of measurements of ${}^{27}\mathrm{Al}$ and ${}^{55}\mathrm{Mn}$ NMR spectra, the related spin-lattice relaxation rates, and the dc magnetic susceptibility of the stable decagonal quasicrystal ${\mathrm{Al}}_{69.8}{\mathrm{Pd}}_{12.1}{\mathrm{Mn}}_{18.2}.$ The temperature variation of the magneti…
Cu2Ta4O12 (CTaO) thin films were successfully deposited on Si(100) substrates by pulsed-laser deposition technique. The crystalline structure and the surface morphology of the CTaO thin films were strongly affected by substrate temperature, oxygen pressure and target - substrate distance. In general during deposition…
The purpose of this study was to chemically modify the surface of chitin whiskers and to investigate the effect of the incorporation of these modified whiskers into a natural rubber (NR) matrix on the properties of the ensuing nanocomposite. Different chemical coupling agents were tested, namely, phenyl isocyanate (PI…
We have investigated the interaction of oxygen vacancies and $180\ifmmode^\circ\else\textdegree\fi{}$ domain walls in tetragonal ${\mathrm{PbTiO}}_{3}$ using density-functional theory. Our calculations indicate that the vacancies do have a lower formation energy in the domain wall than in the bulk, thereby confirming…
Layer-by-layer self-assembly of two polysaccharides, hyaluronan (HA) and chitosan (CH), was employed to engineer bioactive coatings for endovascular stents. A polyethyleneimine (PEI) primer layer was adsorbed on the metallic surface to initiate the sequential adsorption of the weak polyelectrolytes. The multilayer gro…
We measure the viscoelasticity of entangled F-actin over length scales between $1$ and $100\text{ }\ensuremath{\mu}\mathrm{m}$ using one- and two-particle microrheology, and directly identify two distinct microscopic contributions to the elasticity. Filament entanglements lead to a frequency-independent elastic modulu…
Chemically functionalized multiwalled carbon nanotubes were incorporated into a polymer matrix by in situ polymerization, to improve the transfer of mechanical load through a chemical bond, which was demonstrated by Raman and infrared spectroscopies. The resulting composite shows higher storage modulus ( E ‘) and tens…
Pretty vacant. Oxide surfaces are continuously finding new applications in advanced technologies such as corrosion protection, thermal coating, catalysis, sensors, microelectronics, magnetic properties, etc. A understanding of the microscopic properties of oxide surfaces is closely related to the identification of the…
To our knowledge, the biocompatibility of nickel-titanium (NiTi) single crystals has not been reported. Yet certain orientations of single crystals present several advantages over the polycrystalline form in terms of maximal strain, fatigue resistance, and temperature range of superelasticity. Therefore we tested the…
Abstract Niobium-containing hexagonal mesoporous silica has been synthesized using n-dodecylamine as a template; the novel material is very active as a catalyst in the epoxidation of propylene with hydrogen peroxide and alkyl peroxides as oxidants.
Trials of wlding an alloy based on an Ni<sub>3</sub>Al phase matrix with a diode laser have been made. In the base metal of Ni<sub>3</sub>Al, typical casting structures have been found. The Heat Affected Zone consists of a fine-grained structure, whereas in the weld structure, columnar crystals have been observed. A p…
Within the inherent structure thermodynamic formalism introduced by Stillinger and Weber [Phys. Rev. A 25, 978 (1982)]], we address the basic question of the physics of the liquid-liquid transition and of density maxima observed in some complex liquids such as water by identifying, for the first time, the statistical…
Results of a study of dc magnetization $M(T,H),$ performed on a ${\mathrm{Nd}}_{0.6}{\mathrm{Pb}}_{0.4}{\mathrm{MnO}}_{3}$ single crystal in the temperature range around ${T}_{C}$ (Curie temperature) which embraces the supposed critical region $|\ensuremath{\varepsilon}|=|T\ensuremath{-}{T}_{C}|{/T}_{C}<~0.05$ are…
Using an accurate full-potential density-functional method we explore systematically all the $3d$ transition metal pnictides and chalcogenides with wurtzite structure in order to find half-metallic ferromagnets which can be fabricated as thin films with thickness large enough for real spintronic applications. Nine of…
In part III of this paper, alternative Landau potentials for the description of stress-and temperature-induced martensitic phase transformations under arbitrary three-dimensional loading are obtained. These alternative potentials include a sixth-degree (2-4-6) polynomial in Cartesian order parameters and a potential i…