Materials Literature
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A series of phthalocyanines containing 4, 8, and 16 2-ferrocenylethoxy moieties on the periphery have been prepared and spectroscopically characterized. The UV−vis spectrum of the tetraferrocenyl phthalocyanine 4 shows an unusual long-wavelength band at ca. 760 nm in nonpolar solvents. When the spectral changes of thi…
The sonoluminescence (SL) intensity from aqueous solutions containing either alkyl acids or alkylamines is shown to be dependent on both the hydrocarbon chain length of the solute and the pH of the solution. Alkylamines quench the SL only at pH values above about 9 whereas alkyl acids quench only below about pH 7. In…
Ab initio total energy calculations within the Density Functional Theory framework were carried out for Pt(111), Pt(111)-p(2×2)-CO, Pt(111)-p(2×2)-O, and Pt(111)-p(2×2)-(CO+O) to provide an insight into the interaction between CO and O on metal surfaces, an important issue in CO oxidation, and also in promotion and po…
In this work, carbon nanotubes were activated with Pd−Sn catalytic nuclei via a single-step activation approach. These activated nanotubes were used as precursors for obtaining nickel- and palladium-decorated nanotubes via electroless plating. Activation of the nanotube surfaces promoted specific deposition of metal o…
The adsorption of methanol on ordered epitaxial layers of cerium oxides grown on a Cu(111) substrate has been studied using X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), temperature-programmed desorption (TPD), and Fourier transform reflection/absorption infrared spectroscopy (FT-RAIR…
We report a first-principles description of inelastic lifetimes of excited electrons in real Cu and Al, which we compute, within the GW approximation of many-body theory, from the knowledge of the self-energy of the excited quasiparticle. Our full band-structure calculations indicate that actual lifetimes are the resu…
In this work we present a thorough investigation of the mixed system of Rochelle salt doped with ammonium, with 0<=x<=1 for [Na(K{1-x}(NH4)x)C4H4O6 * 4H2O]. This interesting system is known to exhibit a rich phase diagram with a variety of polar and non-polar phases. However, most of the earlier investigations date ba…
The paper reviews the principles of interaction of energetic particles with solid carbon and carbon nanostructures. The reader is first introduced to the basic mechanisms of radiation effects in solids with particular emphasis on atom displacements by knock-on collisions. The influence of various parameters on the dis…
In a typical thermoelectric device, a junction is formed from two different conducting materials, one containing positive charge carriers (holes) and the other negative charge carriers (electrons). When an electric current is passed in the appropriate direction through the junction, both types of charge carriers move…
Various nanoscale semiconducting superlattices have been generated by direct templating in a lyotropic organic liquid crystal. These include superlattices of CdS, CdSe, and ZnS, templated in a liquid crystal formed by oligoethylene oxide oleyl ether amphiphiles and water. The semiconductor growth process copied the sy…
We present the analytic solution of the Mode III steady-state crack in a square lattice with piecewise linear springs and Kelvin viscosity. We show how the results simplify in the limit of large width. We relate our results to a model where the continuum limit is taken only along the crack direction. We present result…
To investigate surface free energy of rubbed polyimide surfaces as a function of the rubbing strength, we measured the contact angle of distilled water and methylene iodide on the polyimide surfaces. For this purpose, a main-chain-type and two side-chain-type polyimides were used. The dispersion force (γd) and the pol…
Prevulcanization of natural rubber latex was investigated as a function of maturation duration. The morphology of the film formed from these latexes was monitored using atomic force microscopy (AFM) as the film aged. The morphology is correlated with the cross-link density of the rubber molecules. Film formed from pre…
The lamellar structures in nylon 6,6 were characterized at several temperatures using synchrotron small-angle X-ray scattering (SAXS) to monitor the changes during the Brill transition at ∼160 °C ( T B ). The integrated intensity and the coherence length of the lamellar stacks increase during heating above T B . In co…
Dynamical experimental studies of the diffraction efficiency, birefringence, and surface relief modulation were carried out on functionalized azopolymer films of p(DR1M-co-MMA) with a 12% mole fraction of DR1M. The gratings were recorded using two linearly polarized pump beams (λ = 514.5 nm) either with a parallel con…
The effects of doping Co for the Ga site on the oxide ion conductivity of La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3 have been investigated in detail. It was found that doping Co is effective for enhancing the oxide ion conductivity. In particular, a significant increase in conductivity in the low-temperature range was observed.…
Accurate orthogonal tight-binding Hamiltonians are constructed for ferromagnetic SrRuO$_3$ and the layered perovskite superconductor, Sr$_2$RuO$_4$ by fitting to all-electron full-potential local density band structures obtained by the linearized augmented planewave method. These Hamiltonians allow the band structure…
In this work we first study the quantum diffusion in a volume of a crystalline solid at high interstitial concentrations when the effects of the short-range interactions between the diffusing particles are to be factors. Within the scope of the small-polaron formalism the transition rate depending on both the temperat…
Superparamagnetism is a unique feature of magnetic nanoparticles. Spinel ferrite nanoparticles provide great opportunities for studying the mechanism of superparamagnetic properties. CoFe 2 O 4 nanocrystallites have been synthesized with a microemulsion method. The neutron diffraction studies and the temperature-depen…
Light scattering has been used to investigate the effect of shear-induced demixing (SID) in polystyrene/poly(vinyl methyl ether) blends of diverse molecular weight distributions down to −30 K below the quiescent spinodal temperature of any blend. The early stage of the demixing process, observed along the vorticity di…