Materials Literature
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We consider a minimal coupled charge / excitation-lattice model capturing a competition between linear polaronic self-trapping and the self-focusing effects of a soft nonlinear on-site potential. The standard single-humped polaron ceases to exist above a critical value of the coupling strength, closely related to the…
The electrical transport properties of semiconducting AlMgB14 films deposited at room temperature and 573K are reported in this letter. The as-deposited films are amorphous, and they exhibit high n-type electrical conductivity, which is believed to stem from the conduction electrons donated by Al, Mg, and/or Fe impuri…
The effect of mechanical deformation on the electrical characteristics of individual multiwall carbon nanotubes (MWCNTs) was investigated by a nanoprobe manipulation technique in a transmission electron microscope (TEM). The electrical conductivity was measured during the deformation of the MWCNT in TEM. The electrica…
Irradiation of high-OH containing amorphous $\mathrm{Si}{\mathrm{O}}_{2}$ is known to introduce a broad absorption band at $4.8\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ and an associated sharp photoluminescence band in the visible red domain, at $1.9\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. Both absorption and luminescen…
The ferrocenic ammonium (Rp)- and (Sp)-[1-CH2NR(3-)-2-CH3-C5H3Fe-C5H5] iodide salts with R=CH3, C2H5, n-C3H7, n-C4H9, were synthesized starting from the (Rp)- and (Sp)-[1-CH2N(CH3)2-2-CH3-C5H3Fe-C5H5] amines obtained in their optically active forms through asymmetric cyclopalladation of [C5H5Fe-C5H4CH2N(CH3)2]. 1H NMR…
This study found “stress-induced magnetization” for epitaxial ferrite films with spinel structure. We grew (111)- and (001)-epitaxial Ni0.17Zn0.23Fe2.60O4(NZF) films on CeO2∕Y0.15Zr0.85O1.93(YSZ)∕Si(001) and oxide single-crystal substrates, respectively. There is a window of lattice mismatch (between 0 and 6.5%) to ac…
We present data on the linear (transmission, index of refraction) and nonlinear (second-order susceptibility) optical properties of the quaternary semiconductor AgGaGe5Se12 with orthorhombic symmetry--a solid solution in the AgxGaxGe1-xSe2 system with x = 0.17. The nonlinear coefficients are estimated from phase-match…
We present a model combining ab initio concepts and molecular dynamics simulations for a more realistic treatment of complex adsorption processes. The energy, distance, and orientation of water molecules adsorbed on stoichiometric and reduced rutile TiO(2)(110) surfaces at 140 K are studied via constant temperature mo…
A supramolecular system of a perylene derivative containing bis(2,6-diacylaminopyridine) units and a perylene bisimide bound through three hydrogen-bonds was synthesized and characterized. 1H NMR spectra confirmed the existence of hydrogen-bonding interactions between the perylene derivative (3) and the perylene bisim…
We investigated the generation dependent shape and internal structure of star-burst dendrimers under good solvent conditions using small angle x-ray scattering and molecular modeling. Measurements have been performed on poly(amidoamine) dendrimers with generations ranging from g=0 up to g=8 at low concentrations in me…
The protein hemoglobin (Hb) or myoglobin (Mb) in a variety of net surface charge states at different pH values was alternately assembled with negatively charged polysaccharide dextran sulfate (Dex) into layer-by-layer (LBL) films on solid surfaces. The proteins in the LBL {Dex/protein} n films demonstrated a pair of w…
The RuO 2 (100) surface exposes regions with (1×1) and c(2×2) symmetry. The (1×1) phase is very active in oxidizing CO, while the c(2×2) phase is inactive because CO does not adsorb on the c(2×2) phase above 100 K. This experimental finding suggests the absence of undercoordinated 1f-cus Ru sites on the RuO 2 (100)-c(…
We report that nanometer-sized silicon-dioxide particles are sintered to optical transparency at temperatures even below 1000°C, forming nonporous bulk silica glass. The resultant silica glass exhibits visible emission, which appears white to the naked eye, in the wavelength range from ∼400to∼700nm at room temperature…
Wettability was controlled in a rational manner by individually and simultaneously manipulating surface topography and surface chemical structure. The first stage of this research involved the adsorption of charged submicrometer polystyrene latex particles to oppositely charged poly(ethylene terephthalate) (PET) film…
Neutral species and positive ions were extracted directly from a C2H2:NH3 plasma used to grow vertically aligned carbon nanotubes (CNTs) and analyzed by mass spectrometry. We observe that NH3 suppresses C2H2 decomposition and encourages CNT formation. We show that the removal of excess carbon, essential for obtaining…
We present a microscopic theory of fluctuation-mediated pairing mechanism in organic superconductors ${(\mathrm{TMTSF})}_{2}X$, where the experimentally observed coexistence of $2{k}_{F}$ charge fluctuation and $2{k}_{F}$ spin fluctuation is naturally taken into account. We have studied, within the random phase approx…
We have built the liquid crystal phase diagram of several binary mixtures of freely rotating hard spherocylinders employing a second-order virial density functional theory with Parsons scaling, suitably generalized to deal with mixtures and smectic phases. The components have the same diameter and aspect ratio of mode…
Abstract Summary: The phase composition and molecular mobility of Nylon 6 fibers has been studied using 1 H solid‐state NMR transverse magnetization relaxation ( T 2 relaxation) spectroscopy. One of the objectives of this work is to determine the usefulness of the NMR relaxation method to accurately determine the crys…
We studied the ultrafast laser-induced coherent phonon oscillation in prismatic shaped gold nanoparticles assembled in monolayer periodic arrays by using the nanosphere lithographic technique. The amplitude and phase of the oscillation observed by ultrafast pump−probe transient spectroscopy is monitored as the wavelen…
The electrical characteristics of Zn0.9Mg0.1O∕ZnOp–n junctions grown by pulsed-laser deposition on bulk, single-crystal ZnO substrates are reported. The forward turn-on voltage of the junctions was in the range 3.6–4V for Pt∕Au metallization used for the p-Ohmic contact on Zn0.9Mg0.1O.The reverse breakdown voltage is…