Materials Literature
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Knowing the dielectric functions of semiconductor nanocrystals isolated in a dielectric matrix is important to both solid-state physics and applications. In this work, we have developed an approach to determine the dielectric function of Si nanocrystals embedded in a ${\mathrm{SiO}}_{2}$ matrix synthesized with Si ion…
The thickness of (110) and (200) sectors in truncated single crystals of linear polyethylene grown from dilute n -octane solution at 95 °C was measured by atomic force microscopy (AFM) in tapping mode. The (110) sector was found to be 1.1 nm thicker than the (200) sector. This can be explained by a somewhat smaller ti…
We report on the acoustic attenuation in an AlPdMn icosahedral quasicrystal between 15 and 300 K, in the tens of GHz range. High frequency coherent longitudinal acoustic waves are excited and detected by an optical ``pump and probe'' technique, in an interferometric configuration. Our results reveal that, at high temp…
Dielectric behavior and phase transitions of [001] oriented $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\ensuremath{-}x{\mathrm{PbTiO}}_{3}$ single crystals with $x=29,$ 31, 32, and 33 % were investigated by impedance measurements and high resolution x-ray diffraction analysis…
Electron-tunneling spectroscopy on ${\mathrm{MgCNi}}_{3}$ has been studied with $N/{\mathrm{MgCNi}}_{3}$ point contacts with $N=\mathrm{PtIr}$ and Au. Most of the measured tunneling conductance show an Andreev reflection peak and a pronounced dip structure outside the peak. We introduce a Josephson junction in series…
Typical functionalization reactions of xylan are reviewed. Moreover, comments about the analytical characterization of the xylan derivatives are given and some structure-property relationships are discussed
The properties of hemicelluloses and especially their softening are important for the performance of paper products; softening temperatures of hemicelluloses have earlier been determined under various conditions. However, there is a lack of mechanical spectroscopic data needed for characterizing their behavior in prod…
Every cloud has a silver lining. The use of poly(styrene sulfonate)/poly(allylamine hydrochloride) (PSS/PAH) polyelectrolyte capsules as microreactors is described for the photochemical synthesis of nanosized silver particles, exclusively, inside a restricted volume of capsule (see graphic). The formed Ag nanoparticle…
Using elastic and inelastic neutron scattering, we investigated the evolution of the local atomic structure and lattice dynamics of La(1-x)SrxCoO3 (x=0-0.5) as it crosses over with x from an insulator to a ferromagnetic metal (FMM). Our pair density function analysis indicates that, in the paramagnetic insulating phas…
Nanoindentation induces versatile deformation mechanisms. The situation is examined here for the case of nanocrystalline Cu by means of parallel molecular dynamics simulations. The indenter is applied to the grain boundary (GB) or to the grain interior. The inter-atomic interaction of Cu is modelled by both the Lennar…
Abstract Hyperbranched fluoropolymers (HBFPs), based on benzyl ether linkages and having a large number of pentafluorophenyl chain ends, were crosslinked by a reaction with diamino‐terminated poly(ethylene glycol) (PEG) or diamino‐terminated poly(dimethyl siloxane) (PDMS) to form hyperbranched–linear copolymer network…
We report on a computational study of the electronic structure of recently discovered clusters with an encapsulated transition metal (TM) atom in a ${\mathrm{Si}}_{12}$ hexagonal prism cage. The cage geometry is remarkably stable regardless of the type of doping TM atom from $3d,4d,$ and $5d$ series. We predict and qu…
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…