Materials Literature
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We developed three-dimensional electrospun silk fibroin (ESF) scaffolds with controllable pore size. The purpose of this study was to evaluate ESF scaffolds with pores (P-ESF) for bone regeneration via in vitro and in vivo studies, with a comparison to a commercially available porous three-dimensional polylactic acid…
After size-selection and osmotic pressure measurements at fixed ionic strength, the behavior of aqueous colloidal suspensions of anisotropic disklike beidellite clay particles has been investigated by combining optical observations under polarized light, rheological, and small angle X-ray scattering (SAXS) experiments…
The reaction of the Zintl compound K(4)Ge(9) with Te and Ga(2)Te(3) in ethylenediamine (en) at 190 degrees C gave the germanium polytelluride {[Ga(en)(3)](2)[(GeTe)(2)(Te(5))(6-)(Te(8))(4-)]}(n) (1). The single-crystal structure analysis revealed that 1 has two different polytelluride fragments: cross-shaped 36-e(-) T…
MnO2–mesoporous carbon hybrid nanocomposites were synthesized to achieve high values of redox pseudocapacitance at scan rates of 100 mV s−1. High-resolution transmission electron microscopy (HRTEM) along with energy dispersive X-ray spectroscopy (EDX) demonstrated that ∼1 nm thick MnO2 nanodomains, resembling a confor…
We report ab initio calculations of the electronic band structure and the phonon dispersion relations of the zincblende-type mercury chalcogenides ($\ensuremath{\beta}\text{-HgS}$, HgSe, and HgTe). The latter have been used to evaluate the temperature dependence of the specific heat, which has been compared with exper…
We examine theoretically the signatures of magnetic adatoms in graphene probed by scanning tunneling spectroscopy (STS). When the adatom hybridizes equally with the two graphene sublattices, the broadening of the local adatom level is anomalous and can scale with the cube of the energy. In contrast to ordinary metal s…
A new bottom-up strategy is used to construct water-soluble organic/inorganic fluorescent unimolecular nanoparticles based on polyhedral oligomeric silsesquioxane (POSS) and conjugated oligoelectrolyte. Their high quantum yield, good cytocompatibility, and unique whole-cell permeability could serve as a light-harvesti…
Cobalt metal particles have several stable phases depending on their size and the temperature employed in the preparation. The face-centred cubic (fcc) structure is thermodynamically stable above 450 °C, whereas the hexagonal-closed packed (hcp) phase is stable at lower temperatures. Cobalt oxide reduction carried out…
Alpha alumina (α‐Al 2 O 3 ) powders and α‐Al 2 O 3 /boehmite (γ‐AlOOH) mixtures with controlled γ‐AlOOH contents were synthesized hydrothermally under alkaline or acidic conditions at 380°–435°C for 1–10 days, under 6.9–14.5 MPa pressure, from concentrated precursors without stirring. The precursors were formed by mix…
We study by molecular dynamics computer simulation a binary soft-sphere mixture that shows a pronounced difference in the species' long-time dynamics. Anomalous, power-law-like diffusion of small particles arises that can be understood as a precursor of a double-transition scenario, combining a glass transition and a…
A generic process has been developed to grow nearly defect free arrays of (heterostructured) InP and GaP nanowires. Soft nanoimprint lithography has been used to pattern gold particle arrays on full 2 inch substrates. After lift-off organic residues remain on the surface, which induce the growth of additional undesire…
The structural, magnetic and resistive properties of (La1-yYy)FeAsO compounds (y = 0.10, 0.20, 0.30) have been investigated by means of X-ray and neutron powder diffraction as well as by resistivity measurements. The temperatures at which the structural transition from tetragonal to orthorhombic and the magnetic order…
Self-assembly provides the ability to create well-controlled nanostructures with electronic or chemical functionality and enables the synthesis of a wide range of useful devices. Diblock copolymers self-assemble into periodic arrays of microdomains with feature sizes of typically 10-50 nm, and have been used to make a…
We present an approach to study the ground-state and elementary excitations in compounds where spins and orbitals are entangled by on-site relativistic spin-orbit interaction. The appropriate degrees of freedom are localized states with an effective angular momentum $J$. We generalize $J$ to arbitrary large values whi…
We studied the temperature dependence of the magnetization reversal in individual submicron permalloy disks with micro-Hall and bend-resistance magnetometry. The nucleation field exhibits a nonmonotonic dependence with positive and negative slopes at low and high temperatures, respectively, while the annihilation fiel…
Using scanning tunneling microscopy and spectroscopy, we demonstrate that the adsorption of a minute amount of Cs on a Pb mesa grown in the quantum regime can induce dramatic morphological changes of the mesa, characterized by the appearance of populous monatomic-layer-high Pb nano-islands on top of the mesa. The edge…
We explore OR gate response in a mesoscopic ring threaded by a magnetic flux $ϕ$. The ring is symmetrically attached to two semi-infinite one-dimensional metallic electrodes and two gate voltages, viz, $V_a$ and $V_b$, are applied in one arm of the ring which are treated as the two inputs of the OR gate. All the calcu…
A localized description, rather than energy bands, is appropriate for the manganite substrate. Empty substrate levels lower in energy than occupied oxygen levels indicate need for further terms beyond the Local Density Approximation. So also does van-der-Waals interaction between the two. Methods to include both are s…
Squared cobalt thin layers of different thickness and width were investigated by numerical simulations. Using zero-valued externally applied magnetic field (geometry driven regime) and different initial conditions the magnetization dynamics were examined. The wavelet-based spectral analysis was applied. Transient stat…
We have measured a strong increase of the low-temperature resistivity ${\ensuremath{\rho}}_{xx}$ and a zero-value plateau in the Hall conductivity ${\ensuremath{\sigma}}_{xy}$ at the charge neutrality point in graphene subjected to high magnetic fields up to 30 T. We explain our results by a simple model involving a f…