Materials Literature
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The use of nanostructures in photovoltaics offers the potential for high efficiency by either using new physical mechanisms or by allowing solar cells which have efficiencies closer to their theoretical maximum, for example by tailoring material properties. At the same time, nanostructures have potentially low fabrica…
Nanometer scale morphological changes in the passive oxide on aluminum have been tracked as a function of polarization in aqueous chloride and borate electrolytes. Nanoscale void formation has been detected and characterized in the passive oxide on single and polycrystalline Al as well as nanocrystalline Al films. Voi…
In this study, electrochemical behaviors of Co(II) and Pd(II) phthalocyanines carrying tetrakisdiethoxymalonyl and Pd(II) phthalocyanine carrying tetrakiscarboxymethyl substituents at the peripheral positions are investigated by cyclic voltammetry and applied potential chronocoulometry techniques. Cyclic voltammetric…
We studied certain kinds of diepoxy monomers, with so-called `mesogens'- molecular groups that cause self-ordering - and cured them with appropriate curing agents. Their thermal conductivities were up to 5 times higher than those of conventional epoxy resins. We believe that the mesogens formed nanoscopic high-order s…
Abstract Isostructural ferromagnetic and ferroelectric perovskites like manganites (La,A)MnO 3 and titanates Pb(Zr,Ti)O 3 are favourable candidates for layered film structures with large magnetoelectric coupling phenomena. Manganites (La,A)MnO 3 have already been intensively investigated: conduction electrons have a h…
Grain size and piezoelectric properties were investigated in (K, Na)NbO3 ceramics substituted with Ba for K and Na by 1 to 5 mol%, in anticipation of high piezoelectric properties. The grain size strongly depended on the A/B ratio in perovskite structure. The grain growth phenomenon was markedly similar to that of BaT…
A pH-sensitive pyridine-based gelator has been found as a flexible and efficient template for the transcription of nanofibrous silica. The morphology and aggregation degree of silica nanofibers and nanotubes (30–60 nm thick, with 3–10 nm inner channels) could be tuned by simply adjusting the pH conditions through the…
Engineering of porous solid oxide fuel cell (SOFC) composite cathodes comprising a mixture of electrocatalyst and ionic conductor requires the knowledge of electrochemical kinetic parameters such as the reaction order and the charge-transfer coefficients. Conventional dc techniques are commonly employed in electrochem…
Statistics show that the wear comfort is the most important property of clothing demanded by users and consumers. Hence, biofunctional textiles only have a high market potential, if they are comfortable. In this work it is shown how the thermophysiological and skin sensorial wear comfort of biofunctional textiles can…
Two sets of laboratory-prepared and industrial nickel hydroxide samples were studied and their microstructure characterized by performing Rietveld refinements with a spherical harmonic-implemented algorithm using both neutron and X-ray powder diffraction data. The results indicate that the anisotropic line broadening…
PbS nanowires glazed with silica have been deposited by CVD using PbCl2 and S on silicon substrates at temperatures between 650 and 700 °C.
A parabolic-hyperbolic nonconserved phase-field model is here analyzed. This isan evolution system consisting of a parabolic equation for the relative temperature$\theta$ which is nonlinearly coupled with a semilinear damped wave equation governing theorder parameter $\chi$. The latter equation is characterized by a n…
A single-chamber solid oxide fuel cell (SC-SOFC) with micropatterned electrodes on the electrolyte has been fabricated by a microfluidic lithography technique. Microchannels formed by contacting the polydimethylsiloxane mold with a polished substrate of YSZ disk were filled with the well-dispersed suspensions of the c…
Growth, atomic structure and O2 partial pressure dependent phase transitions of Ni-O structures and thin NiO films on Pt(111) have been studied using scanning tunnelling microscopy (STM), low-energy electron diffraction (LEED), and Auger electron spectroscopy (AES). In situ STM experiments were performed during film g…
Properties and characteristics of superelastic deformation behavior based on Lüders-Like phase transformation bands in TiNi shape memory alloy (SMA) are presented. Temperature distributions accompanying the stress-induced phase transformations in the SMA are found using the infrared technique and employed for the inve…
We have developed a compact retarding-type Mott spin polarimeter with a large collection angle at the Hiroshima Synchrotron Radiation Center and obtained a reliable value of the effective Sherman function by a self-calibration method. The spin polarization of secondary electrons was evaluated by extrapolation of the l…
This paper reports measurement results of instrumental analyses, permittivity, conduction current, and space charge distribution profiles observed in low-density polyethylene/MgO nanocomposites with various filler contents, done with the intention to clarify the filler-content dependence of dielectric properties. The…
Using regioselective dendritic functionalized cellulose, CdS quantum dot nanoparticles were prepared and their photo-optical properties and morphology as well as the preliminary biocompatibility of the hybrid were investigated.
The properties of a grounded dielectric slab with double negative (DNG) metamaterials are investigated in this paper.Dramatically different dispersion curves of evanescent surface modes (electromagnetic fields exponentially decay both in air and inside the slab) are observed.They are highly dependent on the medium par…
Abstract—Novel isotropic planar and three-dimensional negative refractive index (NRI) metamaterial (MTM) designs consisting of periodically arranged cross structures are developed in the terahertz (THz) frequency regime using group theory. The novel designs not only avoid magnetoelectric coupling but also enable a sim…