Materials Literature
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We fabricated cantilevers for magnetic force microscopy with carbon nanotube tips coated with magnetic material. Images of a custom hard drive demonstrated 20 nm lateral resolution, with prospects for further improvements.
The ultrafast response of a high-reflectivity GaAs/AlAs Bragg mirror to optical pumping is investigated for all-optical switching applications. Both Kerr and free carrier nonlinearities are induced with 100 fs, 780 nm pulses with a fluence of 0.64 kJ/m^2 and 0.8 kJ/m^2. The absolute transmission of the mirror at 931 n…
Model combinatorial films (CFs) which host a pure superconductor adjacent to a ferromagneticsuperconducting hybrid film (HF) are manufactured for the study of the influence of ferromagnetic nanoparticles (FNs) on the nucleation of superconductivity. Careful resistance measurements were performed simultaneously on two…
A systematic study of magnetic properties of ${\mathrm{Ni}}_{2+x}{\mathrm{Mn}}_{1\ensuremath{-}x}\mathrm{Ga}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.19)$ Heusler alloys undergoing structural martensite-austenite transformations while in the ferromagnetic state has been performed. From measurements of sponta…
We develop a microscopic theory of the single impurity Kondo effect on a metallic surface. We calculate the hybridization energies for the Anderson Hamiltonian of a magnetic impurity interacting with surface and bulk states and show that, contrary to the Kondo effect of an impurity in the bulk, the hybridization matri…
EXPO2004 is the updated version of the EXPO program [Altomare et al. (1999). J. Appl. Cryst . 32 , 339–340]. The traditional steps of the ab initio powder solution process are performed automatically: indexing, space-group determination, decomposition of the pattern for extracting the observed structure-factor moduli,…
Silica microcapsules (hollow spheres) were readily prepared by an interfacial reaction using a water/oil/water (W/O/W) emulsion system. A W/O emulsion consisting of an aqueous solution of sodium silicate (WP-1) and an n -hexane solution of Tween 80 and Span 80 (OP) was added to another aqueous solution of a precipitan…
The response is studied of a narrow-band conductor with bcc lattice to a low-frequency signal under presence of a high-frequency signal. In a high enough dc electric field Ex, the conduction electrons form a bistable system, which results in spontaneous appearance of a transverse electric field Ey. Ac field along y ax…
The aim of this paper is to investigate how the molecular structure of linear polypropylenes can be modified by electron beam irradiation. For this purpose a linear precursor was irradiated with different doses. The samples were analyzed by size-exclusion chromatography coupled with a light scattering detector. With i…
Current stent technology is based on the use of permanent implants that remain life long in the vessel wall, far beyond the time required for the prosthesis to accomplish its main goals of sealing dissection and preventing wall recoil. With the possibility to implant long vessel segments using antiproliferative drugs…
The results of both a line-broadening study on a ceria sample and a size–strain round robin on diffraction line-broadening methods, which was sponsored by the Commission on Powder Diffraction of the International Union of Crystallography, are presented. The sample was prepared by heating hydrated ceria at 923 K for 45…
OBJECTIVES: Implantable devices are major risk factors for hospital-acquired infection. Biomaterials coated with silver oxide or silver alloy have all been used in attempts to reduce infection, in most cases with controversial or disappointing clinical results. We have developed a completely new approach using supercr…
The uptake of pristine single-walled carbon nanotubes into macrophage-like cells has been studied using the nanotubes' intrinsic near-infrared fluorescence. Macrophage samples that have been incubated in growth media containing suspended single-walled nanotubes show characteristic nanotube fluorescence spectra. The fl…
The skeletons of adult echinoderms comprise large single crystals of calcite with smooth convoluted fenestrated morphologies, raising many questions about how they form. By using water etching, infrared spectroscopy, electron diffraction, and environmental scanning electron microscopy, we show that sea urchin spine re…
The (1- x )CaZrO 3 –0.1SrTiO 3 – x TiO 2 system with glass frit is synthesized and its dielectric properties, such as dielectric constant, temperature coefficient and dissipation factor, are determined. The addition of 1 wt% glass frit, which consists of CaO, MgO, Al 2 O 3 and SiO 2 , allows this ternary system to be…
Porous alumina with vertical pores having an average diameter of 100 nm was fabricated by the anodization of highly pure aluminum in oxalic acid solution. A solution of 1,2-dichloroethane containing tris(8-quinolinolato)-aluminum(III) (Alq), N , N '-diphenyl- N , N '-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD…
Abstract The stress–strain diagrams and ultimate tensile properties of uncompatibilized and compatibilized hydrogenated polybutadiene‐ block ‐poly(methyl methacrylate) (HPB‐ b ‐PMMA) blends with 20 wt % poly(methyl methacrylate) (PMMA) droplets dispersed in a low‐density polyethylene (LDPE) matrix were studied. The HP…
The fatigue behavior of ultrafine-grained copper produced by equal channel angular (ECA) pressing was investigated at temperatures between room temperature and 573 K under a constant stress amplitude of 200 MPa. Cyclic softening was found to be much more evident and the corresponding fatigue life decreases rapidly as…
A comparative study on methane and silane derivatives that contain either one or four 2,2‘-dipyridylamino group (dpa) functionalized groups has been carried out. Six new compounds, ( p- dpa-phenyl)triphenylsilane ( 1 ), ( p- dpa-phenyl)triphenylmethane ( 2 ), tetra( p- dpa-phenyl)silane ( 3 ), tetra( p- dpa-phenyl)met…
Crystal structure analyses of a series of three substituted indium phthalocyanines, viz., chloro[1,4,8,11,15,18,22,25-octakis(hexyl)phthalocyaninato]indium(III), 1, 4-fluorophenyl[1,4,8,11,15,18,22,25-octakis(hexyl)phthalocyaninato]indium(III), 2, and racemic chloro[2-bromo-1,4-dibutoxy-8,11,15,18,22,25-hexakis(hexyl)…