Materials Literature
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Metallic mirrors will be essential components of the optical diagnostic systems in the International Thermonuclear Experimental Reactor (ITER). Reliability of these systems may be affected by mirror reflectivity changes induced by erosion and/or deposition of impurities (carbon, beryllium). The present study aims to a…
The percolation behavior and mechanisms of electrical conductivity in carbon black filled polymer composites were analyzed. An aggregate structure model of the carbon black particles was proposed based on the effective media theory (EMT) and the equivalent sphere of carbon black aggregate acts as a basic cell to descr…
During a hypothetical severe nuclear accident on a pressurized water reactor (PWR), it is of primary importance to assess potential radionuclide release into the environment, and thus to better understand the volatile ruthenium tetroxide stability, in the containment building, due to its high radiotoxicity. The stabil…
Photoluminescence (PL) spectra of 6H–SiC nanostructures (nanoporous layers and nanopowder) fabricated by electrochemical etching of bulk wafers consist of broad subgap emission bands as well as above-gap tails. These features are explained, respectively, in terms of radiative recombinations via N–Al donor-acceptor ele…
The ternary layered Tl-contained semiconductor ferroelectrics TlInS2, TlGaS2, and TlGaSe2, exhibiting an incommensurate phase and a relaxor state with temperature, were approached down to 0.76eV at room temperature by spectroscopic phase modulated ellipsometry in a region below the energy gap of each material. By usin…
( Pb ) ( Zr 0.52 Ti 0.48 ) O 3 (PZT) films were fabricated on LaNiO3 (LNO)/In2O3 90%SnO210% (ITO) layered transparent electrodes on glass substrates using chemical solution deposition. The structural, electrical, and optical properties of semitransparent Pd/PZT/LNO/ITO and transparent ITO/LNO/PZT/LNO/ITO capacitors fa…
Intense four- and five-photon ultraviolet upconversion processes through sensitization of Tm3+ ions in transparent SiO2-Al2O3-NaF-YF3 glass ceramics triply doped with Tm3+/Yb3+/Nd3+ under 796 nm excitation were investigated. Judd-Ofelt analyses evidenced the incorporation of rare-earth ions into the precipitated beta-…
LaF 3 : Er , Yb nanoparticle-doped organic-inorganic hybrid material waveguides were demonstrated using reactive ion etching technology. The absorption and photoluminescence spectra were observed on a 140μm thick film of the nanoparticle-doped hybrid material. Under excitation at 976nm, the fluorescence was obtained a…
In the present letter, a design for active left-handed material collaborated with microwave varactors is proposed and experimentally realized. Both the results of simulation and experiment verify the tunable left-handed properties of the structure in microwave band. A controllable beam steering is then observed experi…
The photoluminescence phenomena of Ce3+-doped Y3Al5O12 nanophosphors synthesized by the chemical gelation were investigated and compared with bulk phosphors. The oxidation state of the cerium ions in the nanophosphors was determined to be trivalent. This is an essential characteristic of phosphor’s emission. The Stoke…
Abgerollt: Bei einem neuen Konzept zur „Formwandlung“ (siehe Bild) werden 1D-Wolframoxid-Nanostäbe ausgerollt und in seitlich abgeschlossene 2D-WS2-Nanoschichtkristalle überführt. Die so erhaltenen Schichtkristalle zeichnen sich durch eine deutlich erhöhte Entladungskapazität aus und können dank ihrer Form und ihrer n…
Plate-impact experiments were performed to examine the influence of grain size on the dynamic tensile (or spall) behavior of shocked polycrystalline aluminum. Ultrapure and commercially pure 1050 aluminum plates were cold rolled to 80% strain and heat treated under predetermined conditions to produce recrystallized sa…
We have investigated the effects of high-oxygen-pressure crystal growth of ferroelectric Bi4Ti3O12 on the polarization properties along the a(b) axis. Domain observations by piezoresponse force microscope demonstrate that a small remanent polarization (Pr) for the crystals grown at 0.02MPa is attributed to the clampin…
Blends of polycaprolactone (PCL) and chitosan (CHT) were prepared by casting from a solution. CHT and PCL were dissolved by using acetic acid/water mixtures. Both solutions were slowly mixed to cast blend films containing 10%, 20%, 30%, and 40% by weight of CHT. PCL and CHT form phase separated blends. The phase morph…
The influence of temperature, T , and strain rate, , on the reaction between the edge dislocation line and a periodic row of 4 nm interstitial dislocation loops with Burgers vector in α-Fe has been investigated by means of molecular dynamics, using a potential developed recently for body centred cubic Fe (Ackland et a…
Dielectric response of tetragonal tungsten bronze dielectrics (BaxSr1−x)4Nd2Ti4Nb6O30 was investigated over a broad temperature and frequency range, and the obvious composition-dependent dielectric anomalies with respect to x value were discussed in detail in association with the radius differences between A1- and A2-…
The objective of this study was to develop novel absorbable films suitable for use as a tissue-engineering scaffold for keratinocytes as a therapy for replacement of damaged skin. Poly(4-hydroxybutyrate) (P(4HB)) and poly (3-hydroxybutyrate) (P(3HB)) were blended with small amounts of the polysaccharides hyaluronic ac…
We report the near-edge x-ray absorption fine structure (NEXAFS) and x-ray magnetic circular dichroism (XMCD) experiments on well characterized Mn doped ZnO thin films that show ferromagnetism at room temperature. The NEXAFS measurements at O K edge clearly exhibit a preedge spectral feature which evolves with Mn dopi…
Abstract BACKGROUND: Polyaniline (PANI) has attracted much attention in many fields due to its chemical and physical properties, and different nanostructures of PANI changing from one‐dimensional to three‐dimensional have been obtained. By changing the concentration of cetyltrimethylammonium bromide (CTAB), the morpho…
We have studied the behavior of a colloidal gel under oscillatory shear. The quiescent gel was an arrested structure formed by a 40% volume fraction hard-sphere suspension in which a "depletion" interparticle attraction was induced by adding nonadsorbing polymer. We applied progressively larger amplitude oscillatory s…