Materials Literature
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Holed up: Individual nanometer hole–particle pairs are prepared by self-assembly and their optical properties studied. A single nanoparticle is located in a single nanohole, which creates hot sites between them, thus greatly enhancing Raman signals of probe molecules. The enhancement is shown to depend on the spacing…
Protein serine/threonine phosphatase 4 (PP4c) is an essential polypeptide involved in critical cellular processes such as microtubule growth and organization, DNA damage checkpoint recovery, apoptosis, and tumor necrosis factor alpha signaling. Like other phosphatases of the PP2A family, PP4c interacts with regulatory…
We present first principles, density functional theory (DFT) calculations of the structural and electronic properties of thiolate-protected gold nanoparticles [Au(102)(MBA)(44) ] that have been recently crystallized and measured by X-ray diffraction. Our calculations yield structural properties in very good agreement…
Zirconium selenophosphate compounds with a unique polar structure show strong second harmonic generation and they dissolve in polar solvent to produce photoluminescent solutions.
The combined effects of crystallographic orientation, stacking fault energy (SFE) and grain size on deformation twinning behavior in several face-centred cubic (fcc) crystals were investigated experimentally and analytically. Three types of fcc crystals, Al single crystals, Cu single crystals and polycrystalline Cu–3%…
Polarized and unpolarized neutron-diffraction measurements have been carried out to investigate the iron magnetic order in undoped NdFeAsO. Antiferromagnetic order is observed below 141(6) K, which is in close proximity to the structural distortion observed in this material. The magnetic structure consists of chains o…
Water-soluble and stable semiconductor CdSe/ZnS quantum dots (QDs) are prepared by using β- and α-cyclodextrin (CD) as surface-coating agents by using a simple sonochemical method, which allows highly enantioselective fluorescent recognition of amino acids (see image). When CD-QDs are treated with L-amino acids (see i…
We report on the demonstration of a low emittance, high brightness ion source based on magneto-optically trapped neutral atoms. Our source has ion optical properties comparable to or better than those of the commonly used liquid metal ion source. In addition, it has several advantages that offer new possibilities, inc…
Single sheets of hexagonal boron nitride on transition metals provide a model system for single layer dielectrics. The progress in the understanding of h-BN layers on transition metals of the last 10 years are shortly reviewed. Particular emphasis lies on the boron nitride nanomesh on Rh(111), which is a corrugated si…
Taking advantage of the quick and efficient access of vapor to surfaces, a simple, solvent-free method is demonstrated to synthesize Janus colloidal particles in large quantity and with high efficiency. First, at the liquid-liquid interface of emulsified molten wax and water, untreated silica particles adsorb and are…
Fluorescence resonance energy transfer between the metal core and the ligand in Au 25 SG 18 (SG-glutathione thiolate) is demonstrated using dansyl chromophores attached to the cluster core through glutathione linkers. The dansyl chromophore functionalization of the cluster has been carried out by two different routes.…
We report the direct observation of spin-singlet dark excitons in individual single-walled carbon nanotubes through low-temperature micro-magneto-photoluminescence spectroscopy. A magnetic field (B) applied along the tube axis brightened the dark state, leading to the emergence of a new emission peak. The peak rapidly…
In a ferromagnetic nanodisk, the magnetization tends to swirl around in the plane of the disk and can point either up or down at the center of this magnetic vortex. This binary state can be useful for information storage. It is demonstrated that a single nanosecond current pulse can switch the core polarity. This meth…
We investigate carrier transport in a single 22 nm-thick double-gated Si quantum well device, which has independent contacts to electrons and holes. Conductance, Hall density and Hall mobility are mapped in a broad double-gate voltage window. When the gate voltage asymmetry is not too large only either electrons or ho…
We calculate the scattering rates of phonons on two-level systems in disordered trigonal and hexagonal crystals. We apply a model in which the two-level system, characterized by a direction in space, is coupled to the strain field of the phonon via a tensor of coupling constants. The structure of the tensor of couplin…
A novel beta-diketone, 4,4,5,5,5-pentafluoro-1-(naphthalen-2-yl)pentane-1,3-dione (HPFNP), which contains polyfluorinated alkyl group, as well as the long conjugated naphthyl group, has been used for the synthesis of a series of new tris(beta-diketonate)europium(III) complexes of the general formula Eu(PFNP)3 x L [whe…
Rigid particles as well as soft capsules can be ingested by cells and stored in acidic compartments around the nucleus. TEM and fluorescence images show that the rigid particles retain their original spherical shape whereas the hollow and thus more flexible capsules are deformed and squeezed upon the incorporation pro…
The low-temperature behavior of Ce2RuZn4 has been investigated. Specific heat and magnetic susceptibility data reveal an antiferromagnetic transition at a Neel temperature of 2 K. Ce2RuZn4 is a static intermediate-valent compound with two crystallographically independent cerium atoms. The magnetic data clearly show th…
Thin layers of GaMnAs ferromagnetic semiconductor grown by molecular beam epitaxy on GaAs(001) substrates were studied. To improve their magnetic properties the post-growth annealing procedures were applied, using the surface passivation layers of amorphous arsenic. This post growth treatment effectively increases the…
A stress-induced stripe phase of submonolayer Pd on W(110) is observed by low-energy electron microscopy. The temperature dependence of the pattern is explained by the change both in the boundary free energy and elastic relaxation energy due to the increasing boundary width. The stripes are shown to disorder when the…