Materials Literature
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We report on the first measurement of the thermal conductivity of a suspended single layer graphene. The measurements were performed using a non-contact optical technique. The near room-temperature values of the thermal conductivity in the range ~ 4840 to 5300 W/mK were extracted for a single-layer graphene. The extre…
Systematic time-resolved measurements on neutral and charged excitonic complexes (X, XX, X+, and XX+) of 26 different single InAs∕GaAs quantum dots are reported. The ratios of the decay times are discussed in terms of the number of transition channels determined by the excitonic fine structure and a specific transitio…
In the spin 1/2 antiferromagnetic Ca2CuO3 the optical excitation along 1D a Cu-O chain showed the enrichment of forbidden peaks that could not be explained by the group theory. We present the cluster-model ab initio study of these optical phonons based on the Hartree-Fock SCF calculation with the 3-21G basic set. The…
Starting from known kinematic picture for plasticity, we derive a set of dynamical equations describing plastic flow in a Lagrangian formulation. Our derivation is a natural and a straightforward extension of simple fluids, elastic and viscous solids theories. These equations contain the Maxwell model as a special lim…
High quality epitaxial thin films of LaBiMn4∕3Co2∕3O6 perovskite were fabricated on (001)-oriented SrTiO3 and LaAlO3 substrates by the pulsed laser deposition technique. Magnetization measurements reveal a strong magnetic anisotropy and a ferromagnetic behavior that is in agreement with a superexchange interaction bet…
A computationally simple way to accommodate 'basins' of trapping sites in standard kinetic Monte Carlo simulations is presented. By assuming the system is effectively equilibrated in the basin, the residence time (time spent in the basin before escape) and the probabilities for transition to states outside the basin m…
We have measured the mechanical properties of few-layer graphene and graphite flakes that are suspended over circular holes. The spatial profile of the flake’s spring constant is measured with an atomic force microscope. The bending rigidity of and the tension in the membranes are extracted by fitting a continuum mode…
Abstract Multicomponent hybrid nanostructures that contain two or more nanometer‐scale components have attracted much attention recently owing to the synergistic properties induced by interactions between these different nanometer‐scale objects. Herein, we give an overview of the efforts to synthesize multicomponent n…
Zur Freisetzung von Wasserstoff: Eine einfache und effiziente Methode liefert amorphe Eisennanopartikel mit hoher katalytischer Aktivität bei der Erzeugung von Wasserstoff aus wässrigen Lösungen des Ammoniak-Boran-Komplexes (siehe Bild). Der Prozess läuft auch an der Luft ab, und der Katalysator kann ohne Aktivitätsve…
Attractive hydrogen production? The amorphous Fe nanoparticles prepared following a simple but very efficient method possess high catalytic activity (see picture) for the generation of hydrogen from an aqueous solution of ammonia borane, even in air, and can readily be recycled with no obvious loss of catalytic activi…
We report a bioinspired templating technique for fabricating broadband antireflection coatings that mimic antireflective moth eyes. Wafer-scale, subwavelength-structured nipple arrays are directly patterned on silicon using spin-coated silica colloidal monolayers as etching masks. The templated gratings exhibit excell…
Glycosaminogycans (GAGs) are involved in numerous vital functions in the human body. Mapping the GAG concentration in vivo is desirable for the diagnosis and monitoring of a number of diseases such as osteoarthritis, which affects millions of individuals. GAG loss in cartilage is typically an initiating event in osteo…
An isomorphous series of three novel lanthanide coordination polymers [Ln(PCPA)3(glycol)] n , [where, Ln = La(1); Nd(2); Gd(3); PCPA = p-chlorophenoxyacetate] have been synthesized under hydrothermal conditions and characterized by elemental analyses, IR spectra, TG analysis, fluorescence spectra and single crystal X-…
The photoluminescence spectrum of the freshly photosynthesized porous silicon (PS) has been investigated. This measurement was repeated after three and six months for the same sample after storage under ambient condition (open air at room temperature). Photoluminescence (PL) measurements of the stored PS show differen…
Spin Hall effect in metallic Pt is studied with first-principles relativistic band calculations. It is found that intrinsic spin Hall conductivity (SHC) is as large as $\sim 2000 (\hbar/e)(Ω{\rm cm})^{-1}$ at low temperature, and decreases down to $\sim 200 (\hbar/e)(Ω{\rm cm})^{-1}$ at room temperature. It is due to…
The structure of cellulose from bamboo fiber before and after treatment in formic acid was investigated in comparison with microcrystalline-cellulose by solid state NMR, FTIR, and X-ray diffraction diagrams. Differences of molecular structures among two kinds of celluloses were validated and expatiated. Results from t…
{\it Ab initio} calculations within density functional theory with generalized gradient approximation have been performed to study the effects of oxygen vacancies on the electronic structure and magnetism in undoped V$_2$O$_{5-x}$ ($0 < x < 0.5$). It is found that the introduction of oxygen vacancies would induce ferr…
Disodium hexamanganese(II,III) germanate is the first aenigmatite-type compound with significant amounts of manganese. Na(2)(Mn(5.26)Na(0.74))Ge(6)O(20) is triclinic and contains two different Na positions, six Ge positions and 20 O positions (all with site symmetry 1 on general position 2i of space group P1). Five ou…
The mesostructure of hexagonal phases in lyotropic liquid crystals and some inorganic derivates is reconsidered in topological terms, and it is argued that related rhombohedral sponge and mesh structures may well form in the vicinity of a conventional hexagonal phase. The standard signature of a hexagonal phase from s…
The presentation of bioactive ligands on biomaterial surfaces is often confounded by the adsorption of proteins present in the biological milieu, rendering any type of cellular response nonspecific. We have engineered a polyelectrolyte complex membrane that demonstrates specific adhesion of various cell types for both…