Materials Literature
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The internal structure of porous TiO2 films prepared by electrostatic layer-by-layer deposition was investigated. The films were prepared by alternate dipping of solid substrates into dispersions of TiO2 nanoparticles and polycations, polyanions, or pure buffer solution, respectively. The surface charge of the amphote…
In this work, Judd–Ofelt analysis is applied to rare-earth-doped lead-indium-phosphate glasses (RE-PbInPO4, where RE=Er3+ and Nd3+) in order to evaluate their potential as both glass laser systems and amplifier materials. The phenomenological Judd–Ofelt parameters Ω(2), Ω(4), and Ω(6) are determined for both rare-eart…
Absorption and luminescence experiments were performed in thulium (Tm3+)-doped TeO2-PbO glass samples. Spectroscopic quantities such as transition probabilities, branching ratios, and radiative lifetimes related to the Tm3+ ions were determined using the Judd-Ofelt theory. Luminescence properties were studied by excit…
Novel manufacturing technologies for high-strength structure components of aluminium allow a local modification of material properties to respond to operational demands. Machining and finishing processes for changing material properties like deep rolling or rubbing are to be combined to a single process step. Intentio…
The electric-field-induced resonance method [Poncharal et al., Science 283, 5 (1999)] has been widely applied to measure the Young's moduli of nanowires. In the present paper, a systematic study of the effects of various clamp uncertainties (partially pinned, elastic foundation, unknown defects, etc.) on the Young's m…
Zn-doping Ba8Ga16ZnxGe30−x (x=2.4, 2.6, 2.8, 3.0, 3.2) clathrates with different Zn contents were synthesized by combining the solid-state reaction with the spark plasma sintering method. The effects of Zn content on thermoelectric properties were investigated. The results show that all specimens exhibit p-type conduc…
The magnetic and electric static and dynamic properties of hexagonal multiferroic RMnO3 are studied based on the transverse Ising and Heisenberg models using a Green’s function technique. The influence of the magnetoelectric coupling and the exchange interaction constants is discussed. The coexistence of ferroelectric…
The effect of hydrogen on the conductivity of ZnO nanoparticles has implications for nanoscale optoelectronic devices. In this study, infrared reflectance spectra of as-grown and hydrogen-annealed ZnO nanoparticles were measured at near-normal incidence. The as-grown particles were electrically semi-insulating and sho…
Influences of Ca addition on microstructures and mechanical properties at room and elevated temperatures have been investigated for Mg-1.5%Nd-1.0%RE-0.5%Zn-(0~1.0)%Ca casting alloys, on basis of experimental results from X-ray diffractometry (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectr…
It is well known that the main failure mechanisms in die-casting mould are heat checking due to thermal fatigue and melt-out caused by chemical reaction between die and molten alloys. Thermal fatigue tests were carried out using the thermal cycle simulator to establish the proper method to estimate the thermal fatigue…
Frequency spectra of sphere-, cube-, and tetrahedron-shaped Si nanoparticles with sizes ranging from $0.732\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}4.223\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, evaluated using molecular mechanics, are reported. A consistent size dependence of the traction-free vi…
Strategy and function of a new developed FEM code COSMAP(COmputer Simulation of MAterial Process) for surface hardening during of thermo-mechanical processing, including heat treatment, carbonizing and nitriding, is briefly introduced in this paper. The simulation code is developed based on the metallo-thermo-mechanic…
Himmelblaue Forschung: Untersuchungen zur Photo- und Elektrolumineszenz einer Serie von Ce3+-Komplexen mit Benzimidazol-Tripodliganden ergaben einen effektiven Energietransfer von metall- wie ligandenbasierten Übergängen und eine effiziente blaue metallzentrierte Emission. Eine blau emittierende Leuchtdiode, die mit e…
Cobalt(II) phthalocyanine (CoPc), cobalt(II) tetrachloro phthalocyanine (CoPcCl4), cobalt(II) octachloro phthalocyanine (CoPcCl8) and cobalt(II) hexadecachloro phthalocyanine (CoPcCl16) are synthesized pure and characterized using elemental analysis, UV-visible, IR-spectroscopy, magnetic susceptibility, X-ray crystall…
The catalytic partial oxidation of methane to syngas presents interesting challenges, because of the interaction of exothermic combustion and endothermic reforming reactions. The heterogeneous plug-flow and axial-dispersion models are used to analyze the steady-state and dynamic behavior exhibited by this process in a…
BiFeO 3 thin films were processed on La0.8Sr0.2MnO3 (LSMO) buffered silicon substrate via chemical solution deposition. Short-wave ultraviolet assisted pyrolysis was conducted in oxygen atmosphere in order to improve microstructure. A fine, homogeneous, and phase-pure grain structure with smooth topography was obtaine…
Field emission properties of a stand-alone MgO-coated carbon nanotube (CNT) have been investigated by a field emission microscopy. A finite element method is used to analyze the electric field distribution on the surface of a CNT and in the layer of MgO. It is found that the dielectric MgO layer decreases the strength…
Complicated domain configurations generated during the magnetization reversal of Permalloy elements patterned in various shapes are the results of a surprisingly few switching mechanisms. By comparing the results from micromagnetic simulations with the experimentally observed switching events imaged by Lorentz microsc…
We combine the self-assembly properties of amphiphilic molecules with the radiolysis method to produce specific sizes and shapes of metallic nano-objects. Radiolysis is used to synthesize core--shell structures consisting of nanometric linoleate spherical micelles as the core and silver as the shell. The validity of t…
The optomechanical effect and photoinduced anisotropic deformation induced by illumination of linearly polarized light have been comparatively studied for glassy As2S3 and Se films. The two materials show qualitatively the same behaviors in the mechanical effect and the deformation, which suggests that these photoindu…