Materials Literature
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Metasurfaces have been receiving increasing interest due to the complex array of radiation controlling properties that are possible with single-layer films. This talk and work will focus on metasurfaces that can provide light filtering according to wavelength, polarization, and other properties of an incident beam, an…
The oxidation of highly porous ceramic matrix composites ( PCMC s) based on different Tyranno ® fibers has been analyzed by means of thermogravimetry and electron microscopy. Both uncoated fibers and PCMC materials exhibit parabolic kinetics between 900°C and 1250°C, these being faster for Ti‐doped than for Zr‐doped T…
Ba 0.63 Sr 0.37 TiO 3 (BST) films were first deposited on SiC substrates with LNO bottom electrodes by magnetron sputtering. The BST/LNO/ SiC thin films exhibit high dielectric tunability and low dielectric loss while maintaining excellent temperature coefficient of dielectric constant in the temperature range between…
Abstract Prediction of sewing thread consumption requires an accurate method of calculation since it relates to the cost of manufacturing and distribution of apparel products. Previous researchers highlighted problems in existing thread consumption calculation methods; i.e. limitations in existing formulae which cause…
Among the nanoscale materials, noble metal nanoparticles have been attracting the scientific community due to their unique properties and selectivity in biological applications. In the present investigation, gold nanoparticles (AuNPs) were synthesized using rhizome extract of Dioscorea batatas through a simple, clean,…
Phase pure thin film Bi2Ti2O7 photoelectrodes were produced by aerosol assisted chemical vapour deposition at 600 °C for the first time. X-ray diffraction analysis showed that the as-deposited Bi2Ti2O7 films were amorphous in nature; however, post-deposition annealing at 600 °C for 12 h significantly increased the cry…
Hexagonal boron nitride ( hBN ) thin films were deposited on silicon and quartz substrates using sequential exposures of triethylboron and N 2 / H 2 plasma in a hollow‐cathode plasma‐assisted atomic layer deposition reactor at low temperatures (≤450°C). A non‐saturating film deposition rate was observed for substrate…
Summary Vegetative cell division in diatoms often results in a decreased cell size of one of the daughter cells, which during long‐term cultivation may lead to a gradual decrease of the mean cell size of the culture. To restore the initial cell size, sexual reproduction is required, however, in many diatom cultures se…
We study the magnetic response of buckled honeycomb-lattice materials. The buckling breaks the sublattice symmetry, enhances the spin-orbit coupling, and allows the tuning of a topological quantum phase transition. As a result, there are two doubly degenerate spin-valley coupled massive Dirac bands, which exhibit an u…
The optical and morphological properties of hollow gold nanoparticles (HGNPs) can be finely modified by employing Poly-L-Lysine hydrobromide (PLL), an homo poly aminoacid of the L-lysine, used as reducer and stabilizer. We investigate locally the plasmonic response of these nanostructures by electron energy loss spect…
We propose the rotating thermoelectric (TE) device comprising of the single TE conductor operating in two periodical steady state modes: the switching periodical mode (P-mode) when hot and cold ends of the TE conductor are periodically instantly reversed and the continuous sinusoidal mode (S-mode) when the temperature…
Small objects that are more dense than water may still float at the air-water interface because of surface tension. Whether this is possible depends not only on the density and size of the object, but also on its shape and surface properties, whether other objects are nearby, and how gently the object is placed at the…
环氧树脂胶黏剂在长期载荷作用下产生蠕变变形,尤其是在湿热环境下蠕变现象更加明显,不利于工程实践的推广应用。本文采用CARE多功能拉伸试验机对湿热以及室温环境下的环氧树脂胶黏剂试件进行了5MPa、10MPa、15MPa和17.5MPa定载荷蠕变试验,对比了湿热与室温状态下胶体的蠕变行为。试验结果表明湿热环境对胶体蠕变性能影响显著,并且这种影响随着应力的增大而逐步扩大。同时利用ABAQUS有限元软件对不同状态下环氧树脂胶黏剂的蠕变行为进行了数值模拟,通过对比发现,模拟结果与试验结果吻合,为环氧树脂胶黏剂蠕变特性研究提供了一种有效的分析方式。
This work presents an ex-situ analysis of long-term (>1000 h) aged DMFC. Specifically, the data comprise a comparison of pristine, activated and aged MEA components in order to assess the observed physical changes with respect to their impact on permanent performance loss. The components analyzed by means of X-ray pho…
Les propriétés photoélectroniques de vitrocéramique de chalcogénures Une nouvelle famille de vitrocéramiques, avec une microstructure inédite, a été fabriquée par une cristallisation contrôlée des verres dans le système GeSe2-Sb2Se3-CuI. L'influence de la composition et du processus de cristallisation des verres de ba…
Considérée comme l’avenir de la pratique médicale, la nanomédecine est l’application des nanotechnologies aux soins de santé. Plus qu’un nouveau domaine d’application technologique, la nanomédecine est porteuse d’un nouveau paradigme biomédical qui promeut une conception technoscientifique de la santé. Ce nouveau para…
Double-wall TiO2 nanotube arrays were prepared using an anodization method in a glycerol-containing electrolyte. In situ TEM observation of these samples at high temperature was carried out with and without oxygen injections. With oxygen injection, an improved thermal stability of the nanotubes at high temperature was…
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The aim of this work was determine the transition from juvenile and mature wood and evaluate the wood quality for the lumber production of two species of African mahogany (Khaya ivorensis and Khaya senegalensis). The material researched (19 years old) was from experimental plantation of Vale Natural Reserve, Linhares,…
This paper studies the ways to improve the resistance of the metallurgical equipment details, produced by casting. One of such method provided is a method of local doping. The effectiveness of the local doping by powder fillers is considered. It is found that the local doping with the fillers in the form of ferro-vana…