Materials Literature
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Framework substitution has not been widely reported among the type-II group-IV clathrates. We have performed a theoretical study of the ${\mathrm{Cs}}_{8}{\mathrm{Ga}}_{8}{\mathrm{Si}}_{128}$ and ${\mathrm{Rb}}_{8}{\mathrm{Ga}}_{8}{\mathrm{Si}}_{128}$ clathrates, using the local-density approximation (LDA) to density-…
The atomic interface structure between $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ and $\mathrm{La}\mathrm{Al}{\mathrm{O}}_{3}$ was studied at elevated temperatures employing in situ surface x-ray diffraction. The results at $473\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ indicate that the lattice distorts significantly in tw…
The relaxation dynamics of a zinc protoporphyrin (ZnPP) in THF, KPi buffer, and encapsulated within apomyoglobin (apoMb) was investigated in its excited state using femtosecond fluorescence up-conversion spectroscopy with S2 excitation (lambda(ex) = 430 nm). The S2 --> S1 internal conversion of ZnPP is ultrafast (tau…
Band gap narrowing of N-incorporated ZnO (ZnO:N) was achieved by reactive rf magnetron sputtering in O2∕N2 mixture ambient. ZnO:N films with various band gaps were realized by varying N concentration, which was controlled successfully by varying the rf powers. When rf power was increased to 200W, the ZnO:N films exhib…
Gold nanoparticles (AuNPs) have found widespread applications in lifesciences. While synthesis of monodispersed AuNPs has been fairly convenient by usingchemical reduction of chloroauric acid by sodium citrate, we found that AuNPs of highquality and high concentrations were not readily obtained via this method. As an…
We have synthesized and studied the structural and thermoelectric properties of Ni-substituted partially filled ${\mathrm{Ca}}_{y}{\mathrm{Co}}_{4\ensuremath{-}x}{\mathrm{Ni}}_{x}{\mathrm{Sb}}_{12}$ ($y\ensuremath{\sim}0.10$ and 0.18; $0<x<0.10$) skutterudites. Electrical and thermal properties have been measure…
The poly- l -lysine-functionalized gold nanoparticle (PLL-GNP) was found to undergo reversible assembly/disassembly in the range of pH from 6.5 to 11.0 at room temperature. At a high pH value, the deprotonated lysine residues allow the formation of α-helix and β-sheet structures at the expense of a part of random coil…
beta(2)-Microglobulin (beta2-m), a light chain of the major histocompatibility complex class I, forms amyloid fibrils in patients undergoing long-term haemodialysis, causing dialysis-related amyloidosis. Based on a comparison of the X-ray structure obtained at pH 5.7 and that of beta2-m in the histocompatibility compl…
Aqueous solutions of both poly(ethylene glycol)/poly( dl -lactic acid) (PEG/PDLLA) and poly(ethylene glycol)/poly( l -lactic acid) (PEG/PLLA) multiblock copolymers underwent “clear sol-to-turbid gel-to-syneresis” transitions as the temperature increased. To investigate the stereoisomeric effect on the phase behavior,…
The crystallization kinetics of the polyethylene block within polyethylene- b -polystyrene (PE- b -PS) and polyethylene- b -poly(ethylene- alt -propylene) (PE- b -PEP) diblock copolymers has been investigated in a wide composition range by differential scanning calorimetry (DSC) and compared to an equivalent homopolym…
Vacancy-type defects in as-grown ZnO single crystals have been identified using positron annihilation spectroscopy. The grown-in defects are supposed to be zinc vacancy $({V}_{\mathrm{Zn}})$-related defects, and can be easily removed by annealing above $600\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}…
Gold nanoparticles manipulate the quantum efficiency of phosphorescent molecules, which are attached via biotin−streptavidin recognition at a distance of 4 nm to the nanoparticle surface. Time-resolved luminescence spectroscopy reveals an increase in the radiative as well as in the nonradiative rate of the phosphoresc…
We have synthesized a stable and clinically relevant nanodevice (cRGD-BT-ND; ND for short) that exhibits superior binding to the biologic target alphavbeta3 integrins, when either compared to the same free cRGD peptide or to the biotinylated nanodevice without covalently attached peptides (BT-ND). Selective targeting…
Pure (ZnO) and Eu-doped ZnO (Eu:ZnO) nanostructures have been grown in different morphologies by thermal evaporation. The growth of the structures depends on the temperature and concentration gradient during material deposition as well as on the doping species. X-ray excited optical luminescence (XEOL) from nanostruct…
Hybrid nanofibrous membranes of poly(lactic-co-glycolic acid) (PLGA) and chitosan with different chitosan amounts (32.3, 62.7, and 86.5%) were fabricated via a specially designed electrospinning setup consisting of two sets of separate syringe pumps and power supplies. After soaking in chloroform overnight to dissolve…
In this work we report on theoretical calculations of methanol adsorption and dissociation on the stoichiometric and defective TiO 2 (110) surface. The periodic implementation of density functional theory (DFT) with plane waves and pseudopotentials was employed. A supercell made of 4 × 1 unit cells was used to represe…
We have studied the thermodynamic properties of single-crystalline $\mathrm{Tb}{\mathrm{Fe}}_{3}{(\mathrm{B}{\mathrm{O}}_{3})}_{4}$. Magnetization measurements have been carried out as a function of magnetic field (up to $50\phantom{\rule{0.3em}{0ex}}\mathrm{T}$) and temperature up to $350\phantom{\rule{0.3em}{0ex}}\m…
On the basis of linear hydrodynamics, we analyze the trajectory of particle-hedgehog systems, attracted by a -1/2 disclination (defect line) in a nematic liquid crystal. We show that, as with the interactions between like-particles, the interaction between a particle and a disclination has an electrostatic analogue, t…
Three-dimensional dendritic gold nanostructures (3D-DGNs) were prepared at room temperature through an aqueous/organic interfacial reaction of hydrogen tetrachloroaurate (HAuCl 4, in aqueous phase) and 3,4-ethylenedioxythiophene (EDOT, in organic phase) without the use of any seeds, templates, surfactants, or stabiliz…
We propose a simple dynamic exchange-correlation kernel of the uniform electron gas. We model the reduction of the electron-electron interaction due to short-range exchange-correlation effects by introducing a frequency-dependent error-function effective interaction. By imposing the fulfillment of the compresibility a…