Materials Literature
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Using soft x-ray absorption spectroscopy and magnetic circular dichroism at the Co-L(2,3) edge, we reveal that the spin state transition in LaCoO3 can be well described by a low-spin ground state and a triply degenerate high-spin first excited state. From the temperature dependence of the spectral line shapes, we find…
We report experimental evidence that electromagnetic coupling between physically separated planar metal patterns located in parallel planes provides for extremely strong polarization rotatory power if one pattern is twisted with respect to the other, creating a chiral object. In terms of a rotary power per sample thic…
We review the random first-order transition theory of the glass transition, emphasizing the experimental tests of the theory. Many distinct phenomena are quantitatively predicted or explained by the theory, both above and below the glass transition temperature T(g). These include the following: the viscosity catastrop…
Localized surface plasmon resonance (LSPR) spectroscopy of metallic nanoparticles is a powerful technique for chemical and biological sensing experiments. Moreover, the LSPR is responsible for the electromagnetic-field enhancement that leads to surface-enhanced Raman scattering (SERS) and other surface-enhanced spectr…
Quantum transport through a junction between two metallic zigzag carbon nanotubes connected by intertube links has been studied within the tight-binding method and Landauer formula. It is found that the conductance oscillates with both the coupling strength and length. The close relation between conductance oscillatio…
Carbon microcoils are generally prepared by catalytic chemical vapor deposition of acetylene, using Ni as the catalyst and thiophene as the promoter. In this work, Ni3S2 was chosen as the catalyst on purpose to avoid the introducing of noxious and unpleasant thiophene during the reaction process. The products obtained…
The title compound, KNa[H6α-PtMo6O24]·6H2O, containing the hexamolybdoplatinate(IV) polyanion with the highest level of protonation, was isolated at pH = 0.48. The anion has the Pt atom at an inversion center and has local symmetry close to \overline 3m; there are two independent half-anions in the asymmetric unit. F…
Abstract Y2O3 nanocrystals of tunable morphology and size have been successfully synthesized; the mobility of surface oxygen species on Y2O3 nanocrystals is found, for the first time, to increase with the decrease of the crystal size and to significantly affect the catalytic performances of Ni/Y2O3 catalysts for oxida…
Two crystalline forms of GADPH (D-glyceraldehyde-3-phosphate dehydrogenase) from Spinacia oleracea were obtained using sitting-drop vapor diffusion. Despite the very low concentration of GADPH in the solutions, two crystalline forms were obtained, one of which was the previously reported C222 space group with unit-cel…
Polymer/Clay offer tremendous improvement in wide range of physical and engineering properties for polymers with low filler loading. In nanotechnology polymer/clay nanocomposites use smectitetype clays that have layered structures. In this work, Poly (methyl methacrylate) (PMMA) was synthesized by free radical additio…
Multilayer thin films of cationic phosphorous dendrimers and anionic hyperbranched polyglycerols were fabricated by electrostatic layer-by-layer (LbL) self-assembly (SA). The film formation was monitored by surface plasmon resonance (SPR) spectroscopy and UV-visible spectroscopy, and it was found that the stepwise, al…
Glass fiber reinforced polyester composite and hybrid nanoclay-fiber reinforced composites were prepared by hand lay-up process. The mechanical behavior of these materials and the changes as a result of the incorporation of both nanosize clay and glass fibers were investigated. Composites were prepared with a glass fi…
We investigated the effect of the curvature in lithium storage at single-walled carbon nanotubes, with both ab-initio and Molecular Dynamics simulations. Our results show that the carbon rings of nanotubes develop strong cation-pi- interactions with Li ion. These interactions result in positioning the alkali metal cat…
Polymer-embedded silver clusters have been prepared by thermal decomposition of silver dodecylmercaptide previously dissolved in amorphous polystyrene. The morphology and structure of silver clusters have been determined by transmission electron microscopy (TEM) and large angle X-ray diffractometry (XRD), respectively…
The lifetime of phonon modes undergoing three-phonon interactions in single-wall carbon nanotubes has been calculated. The calculations are based upon an approach using Fermi's golden rule and a quasielastic continuum model for the anharmonic potential. In deriving the relaxation-rate equation, the effects of both nor…
Recent work on coarse-grained representations of interacting homopolymers and diblock copolymers in solution is briefly reviewed. Long homopolymer chains are modelled as ‘ultrasoft colloids’, with the effective interaction between their centres of mass (CM) determined by averaging over polymer conformations for fixed…
We have investigated the phase behavior of the R(F)(7)(EO)(8) surfactant in water as well as the effect of the solubilization of various fluorocarbons in this system. Results show that the cloud point (CP) curve is shifted to high temperatures upon addition of fluorocarbons, following the sequence 1-bromo-perfluorooct…
We develop a free-energy functional for an inhomogeneous system that contains both symmetry conserved and symmetry broken parts of the direct pair correlation function. These correlation functions are found by solving the Ornstein-Zernike equation with the Percus-Yevick closure relation. The method developed here give…
A screw dislocation in strontium titanate has been studied taking benefit of negative spherical aberration-imaging in a spherical aberration-corrected transmission electron microscope. The core structure of the dislocation is atomically resolved with respect to both cation and oxygen columns by the inclusion of the ce…
Plastic bending of single-wall carbon nanotubes is analyzed using minimum energy path calculation with a bond-order potential. The calculation demonstrates that plastic deformation is only thermodynamically favorable above a threshold ``yield curvature'' ${\ensuremath{\rho}}_{\mathrm{yield}}$, and is kinetically feasi…