Materials Literature
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A perturbation method is presented which can be applied to the description of a wide range of physical problems that deal with dynamics of dipolar coupled spins in solids. The method is based on expansion of the operator exponent in a perturbation series. As example of application the method, the multile-quantum coher…
Abstract Carbon nanotubes (CNTs) have been synthesized over Ni–MgO and Ni–Sm–Mg catalysts by decomposition of CH4 at 923 K. The addition of Sm into Ni–MgO catalyst promotes its catalytic activity and lifetime. The yield of CNTs obtained over the optimized Ni–Sm–Mg catalyst reaches 1260 wt % relative to the weight of t…
A thermochemical process based on the occurrence of self-propagating reactions that is able to convert asbestos fibers into harmless, nonfibrous species is proposed. Specifically, a mixture consisting of a waste (containing about 85 wt % of chrysotile), ferric oxide, and magnesium is able, once locally ignited by a th…
The force between two nanoscale colloidal particles dispersed in a solution of freely adsorbing Lennard-Jones homopolymer modifiers is calculated using the expanded grand canonical Monte Carlo simulation method. We investigate the effect of polymer chain length (N), nanoparticle diameter (sigma(c)), and colloid-polyme…
Abstract Tellurium fibers are first synthesized through the reduction of Na2TeO4 by hydrazine hydrate. The as-prepared tellurium fibers are used as templates for further reaction with aqueous AgNO3 solution to get Ag2Te fibers at room temperature.
An easy method of incorporating TiO(2) nanoparticles into Nafion perfluorinated ionomer is proposed. Ultrathin films of Nafion were prepared by employing the Langmuir-Schaefer (LS) technique. The pressure-area isotherm study of a Langmuir monolayer of Nafion at the air-water interface on different concentrations of Na…
We describe the integration of a photochromic azobenzene dye into electrostatically bound polyelectrolyte multilayers. Two different deposition techniques are compared: electrostatic self-assembly (ESA) and polyelectrolyte spin-assembly. The polyelectrolytes used were PEI (polyethylenimine) and PAZO (poly[1-[4-(3-carb…
We designed and produced silver–silicon dioxide multilayer thin-film bandpass filters for the ultraviolet range by applying the concept of 'transparent metals'. To calculate the transmission of the designed metallodielectric filters we used the transfer matrix method for lossy structures. We fabricated our multilayer…
Direct transmission electron microscope (TEM) observations of the field emission and evaporation process of emitting carbon nanotubes (CNTs) shown that the tip structure of the CNT is in general composed of irregular shaped graphitic sheets which extend typically more than 10 nm from the end of the CNT. It is found th…
Hydrazine decomposition chemistry was probed over a temperature range from 100 to 800 K for a series of model catalysts prepared by mass-selected Ir(n)(+) deposition on planar Al(2)O(3)/NiAl(110). Two sets of experiments are reported. Temperature-programmed desorption (TPD) was used to study hydrazine desorption and d…
Abstract Polyaniline hollow microspheres with conductivity of 9.7 × 10−3 S/cm were synthesized with alkali-guided method. The alkali (NaOH)-guided oxidation of aniline with ammonium peroxydisulfate as well as doping sulfate anion onto polyaniline.
Cuprous oxide films were successfully electrodeposited onto three different substrates through the reduction of copper lactate in alkaline solution at pH = 10. The substrates include indium tin oxide film coated glass, n-Si wafer with (001) orientation and Au film evaporated onto Si substrate. The substrate effects on…
A family of artificial extracellular matrix proteins developed for application in small-diameter vascular grafts is used to examine the importance of cell-binding domain context on cell adhesion and spreading. The engineered protein sequences are derived from the naturally occurring extracellular matrix proteins elast…
An ethylenediaminetetraacetic acid (EDTA)-mediated hydrothermal route to cerium orthovanadate (CeVO 4 ) microcrystals has been developed. The EDTA/Ce 3+ ratio, solution pH, and temperature of the reaction systems are found to play important roles in determining the morphologies and growth process of the CeVO 4 product…
Experimental deformation micromechanics of regenerated cellulose fibers using Raman spectroscopy have been widely reported. Here we report on computer modeling simulations of Raman band shifts in modes close to the experimentally observed 1095 cm(-1) band, which has previously been shown to shift toward a lower wavenu…
Two new classes of (HCN)(n)...Li and Li...(HCN)(n) (n = 1, 2, 3) clusters with the electride characteristic are formed in theory by the metal Li atom attaching to the (HCN)(n) (n = 1, 2, 3) clusters. Because of the interaction between the Li atom and the (HCN)(n) part, the 2s valence electron of the Li atom becomes a…
Hyperbranched glycopolymers were synthesized by self-condensing vinyl copolymerization (SCVCP) of an acrylic AB* inimer, 2-(2-bromopropionyloxy)ethyl acrylate (BPEA), with 3- O -acryloyl-1,2:5,6-di- O -isopropylidene-α- d -glucofuranoside (AIGlc) via atom transfer radical polymerization (ATRP), followed by deprotectio…
We propose a generalized London theory that can correctly describe the longitudinal and transverse responses of conventional superconductors to an electromagnetic field. The continuity equation is satisfied by use of a special gauge for the scalar and vector potentials. Our phenomenological theory provides a simple ex…
Based on the interpretation of X-ray diffraction data reported for crystals of the poly-L-glutamine-rich 19-peptide D(2)Q(15)K(2), Perutz et al. (Proc. Natl. Acad. Sci. USA 2002, 99, 5591-5595) proposed that hollow, water-filled nanotubes are the basic structural motif of amyloid fibers. We are able to offer an altern…
A new and facile synthetic route of ordered mesoporous carbon with polypyrrole as carbon precursor has been developed. The mesoporous silica host is first impregnated with ferric chloride, which serves as the oxidant for the vapor-phase oxidative polymerization of pyrrole vapor at room temperature. Such a stoichiometr…