Materials Literature
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A numerical investigation of the two-dimensional, oscillatory natural convection during the solidification of a liquid metal contained in a rectangular cavity, having an aspect ratio equal to 4 and submitted to an external uniform magnetic field, is presented. The numerical approach is based on the finite-volume appro…
We investigate the midinfrared generation from difference frequency in self-assembled quantum dots near metal nanoparticles with two-color interband excitations. The generated signal strength is enhanced by several orders of magnitude due to the plasmon-exciton resonance in the nanosuperstructures. The signal enhancem…
Kinase photoactivation: We have demonstrated that a caged analogue of SH2 domain-binding phosphotyrosine peptide can be used as a tool for activating an intracellular phosphatidylinositol 3-kinase (PI3K) by light. This approach should be generally applicable to other protein/lipid kinases of which the catalytic activi…
Impedance spectroscopy is an effective method to investigate physical properties of multicomponent systems so that contributions of individual components can be extracted from different sections of the spectra, which is frequency dependent. Slurries can be considered as 0–3 mixed systems containing a host liquid and d…
We have studied in situ fractured surfaces of single-crystal ${\text{La}}_{0.7}{\text{Sr}}_{0.3}{\text{MnO}}_{3}$ with hard x-ray photoemission (HXPS) at an excitation energy of 7.7 keV. These more bulk-sensitive measurements reveal low-binding-energy satellites in the $\text{Mn}\text{ }2{p}_{3/2}$, $3s$, and $3p$ cor…
The magnetic properties of Fe-Pd magnetic shape memory alloys with different Pd contents are investigated in epitaxial films and by means of density functional calculations. The magnetocrystalline anisotropy energy (MAE) of ordered and disordered Fe-Pd alloys is calculated as a function of $c/a$ ratio and Pd concentra…
In this paper, we report the optical and ultrafast nonlinear optical properties of Yb3+ doped sodium borate and bismuthate glasses. The glasses have been prepared through the melt quench technique. Optical absorption measurements show compositional dependent absorption spectrum of Yb3+, which is due to the higher crys…
The electromagnetic response of bilayer graphene in a magnetic field is studied in comparison to that of monolayer graphene. Both types of graphene turn out to be qualitatively quite similar in dielectric and screening characteristics, especially those deriving from vacuum fluctuations, but the effect is generally muc…
Metal-insulator transitions in strongly correlated oxides such as vanadium oxide (VO2) are of great scientific and technological interest. Due to the presence of multiple oxidation states, synthesis of high-quality VO2 films on substrates with the desired phase transition characteristics such as large jumps in phase t…
A series of fluorescent phosphane oxide derivatives based on diphenylphosphanoethane (DPPE) and diphenylphosphanomethane (DPPM) skeletons has been prepared by means of Grignard reactions and Sonogashira cross-couplings. The photophysical properties and the linear and nonlinear spectra of these compounds have been inve…
Resonant modes corresponding to a spin-soliton resonance (SSR) and a spin-wave resonance (SWR) have been detected and distinguished in the spectra of the electron spin resonance (ESR) of two-dimensional $[\text{Cr}{(\text{CN})}_{6}][\text{Mn}(\text{S})\text{\ensuremath{-}}pn\text{H-}({\text{H}}_{2}\text{O})]{\text{H}}…
We investigated the electronic and structural properties of graphene layers grown on a 6H-SiC (Si-terminated) substrate by using core level photoemission spectroscopy (CLPES), low energy electron diffraction (LEED), and near edge x-ray absorption fine structure (NEXAFS). The angle between the plane of the graphene she…
The reaction of K3[Cr(CN)6] and the copper(II) bis-diamino complex of the ligand 1,3-diaminopropane (tn) led to the new cyanide-bridged 3D polymer ([(Cu(tn)2)3(Cr(CN)6)][Cr(CN)6]) infinity (1). Crystallographic data for 1: trigonal space group R3, a = b = 15.4908(11), c = 16.7699(13) angstroms, Z = 3, V = 3485.0(4) an…
Bi, Ga, and Al codoped germanium glass was prepared and its optical properties were investigated by absorption, photoluminescence excitation (PLE), and photoluminescence spectra. Two active centers which occupy strong and weak crystal field environment are identified by using the PLE spectrum. The tunable and ultrabro…
The synthesis of vertically aligned single-walled carbon nanotubes (VA-SWNTs) by plasma-enhanced chemical vapor deposition (PECVD) was achieved at 500-600 °C, using ethylene as the carbon source and 1 nm Fe film as the catalyst. For growth of high-quality VA-SWNTs in a plasma sheath, it is crucial to alleviate the und…
The subsonic motion of a fast-moving, extended screw dislocation in an fcc metal under constant stress is studied using continuum linear elastic dislocation theory and molecular dynamics (MD) simulation. In this regime, many phenomena predicted by the theory are shown to prevail in simulation, in particular, relativis…
Platinum nanoparticles supported on Al-MCM-48 materials have been prepared. The resultant catalysts have been characterized by means of XRD, N2 physisorption experiments, scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and diffuse reflectance infrared…
Infrared optical emission from erbium-doped silica nanowires is shown to have property characteristic of the material nanostructure and to provide the basis for the fabrication of integrated photonic devices and biosensors. Silica nanowires of approximately 150 nm diameter were grown on a silicon wafer by metal-induce…
Adhesion between chemically dissimilar solids is not often observed for fundamental reasons, especially the large solid−solid interfacial tensions involved that, in turn, derive from the fundamental characteristics of van der Waals and other intermolecular interactions. However, this difficulty can be overcome in many…
Ballistic electrical currents are optically injected into aligned single-walled carbon nanotubes and bulk graphite at 300 K via quantum interference between single and two photon absorption of phase-related 700 and 1400 nm, 150 fs pulses. The transient currents are detected via the emitted terahertz radiation. Optical…