Materials Literature
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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…
First-principles electronic band structure investigations of five compounds of the CaO-Al2O3 family, 3CaO.Al2O3, 12CaO.7Al2O3, CaO.Al2O3, CaO.2Al2O3 and CaO.6Al2O3, as well as CaO and alpha-, theta- and kappa-Al2O3 are performed. We find that the conduction band in the complex oxides is formed from the oxygen antibond…
We study the origin of the cooperative nature of spin crossover (SC) between low-spin and high-spin (HS) states from the viewpoint of elastic interactions among molecules. As the size of each molecule changes depending on its spin state, the elastic interaction among the lattice distortions provides the cooperative in…
We analyze the impact of the magnetic anisotropy on the geometric structure and magnetic ordering of small atomic clusters of palladium, iridium, platinum and gold, using Density Functional Theory. Our results highlight the absolute need to include self-consistently the spin orbit interaction in any simulation of the…
We present measurement and analysis techniques that allow the complete complex magnetoconductivity tensor to be determined from midinfrared ($11--1.6\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$; $100--800\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$) measurements of the complex Faraday $({\ensuremath{\theta}}_{F}…
The longest spin lifetimes in bulk n-GaAs exceed 100 ns for doping concentrations near the metal-insulator transition (J.M. Kikkawa, D.D. Awschalom, Phys. Rev. Lett. 80, 4313 (1998)). The respective electronic states have yet not been identified. We therefore investigate the energy dependence of spin lifetimes in n-Ga…
Density-functional theory is used to investigate hydrogen physisorption on a graphene layer and on single wall carbon nanotubes. Both external and internal adsorption sites of (9, 0) and (10, 0) carbon nanotubes have been studied with the hydrogen molecular axis oriented parallel or perpendicular to the nanotube wall.…