Materials Literature
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Here laser studies of Ce<sup>3+</sup>:LiLu<sub>x</sub>Me<sub>1-x</sub> F<sub>4</sub> (Me=Y<sup>3+</sup>,Yb<sup>3+</sup>) mixed crystals homologous to well-known Ce<sup>3+</sup>:LiYF<sub>4</sub>and Ce<sup>3+</sup>:LiLuF<sub>4</sub> UV crystalline active media are reported. Optical spectroscopy and X-ray diffraction stu…
We report laser filamentation in the bulk of chalcogenide glass with femtosecond laser pulses of energy on the nanojoule level. Spatially resolved measurements of the resulting refractive index modification are presented. The study of the pulse energy and focusing condition dependencies show that channels of positive…
Algal samples were collected from 37 temple-tanks in Palakkad and Thrissur district in Kerala. Collections were carried out during the month of March 2008 and May 2009. Samples were studied in the laboratory and identified. The following algae were present Pandorina cylindricum , Chlorococcum humicolo , Botryococcus b…
Abstract We have demonstrated a site‐selective deposition of uniform single‐wall carbon nanotube (SWCNT) thin films on a SiO 2 /Si substrate using patterned self‐assembled monolayers (SAMs). Non‐polar octadecyltrichlorosilane (OTS) SAM was patterned by ultraviolet (UV) light through shadow mask. Then polar 3‐aminoprop…
The photoemission enhancement with local surface plasmon resonance (LSPR) was studied by two-photon photoemission (2PPE) spectroscopy for size-selected silver (Ag) and gold (Au) metal nanoparticles (NPs) deposited on a hydrogen-terminated Si(111)-(1 × 1) [H−Si(111)] surface. At 0.0015 monolayer equivalents (MLE) of Ag…
Abstract Silver nanorods with increased surface‐enhanced Raman scattering sensitivity and detection have been synthesized in a novel, facile, and eco‐friendly way through a simple chemical reduction method using 2,3‐dihydroxyfumaric acid in aqueous solution under aerobic conditions. The structure and composition of th…
Aromatic−aliphatic copolyesters of poly(ethylene- co -diethylene terephthalate)- co -poly( l -lactic acid) (PEDLT) with different compositions were synthesized by direct melt copolyesterization of l -lactic acid oligomers and poly(ethylene- co -diethylene terephthalate) (PEDT) oligomers. Chemical structures, thermal p…
Die Trends der Bildungsenergien für 41 Perowskite AMO3 bei 298 K entsprechen denen von aus Dichtefunktionalrechnungen mit dem RPBE-GGA-Funktional (siehe Bild; A grün, M blau, O rot). Die Rechnungen erklären auch systematische Trends in den Eigenschaften der Perowskite, zeigen einen direkten Zusammenhang zwischen Zusam…
In a recent publication (T. Ergin et al., Science 328, 337 (2010)), three-dimensional broadband dielectric carpet cloaks have been fabricated and experimentally characterized by optical bright-field and dark-field microscopy using unpolarized light from an incandescent lamp. A direct comparison with theory has not bee…
Bond valence sum calculations have previously suggested that iron oxyborate exhibits charge order of the Fe ions with integer $2+/3+$ valence states. Meanwhile transition metal oxides typically show much smaller, fractional charge disproportionations. Using resonant x-ray diffraction at the iron $K$ edge, we find reso…
Abstract Composite structures of graphene and carbon nanotubes (CNTs) have attracted great interest due to their expected distinguished properties. Here we have investigated the mechanical and electronic properties of new nanostructures based on CNT–graphene covalent‐bonded compounds. magnified image The process of th…
With the aim of obtaining light-responsive liquid-crystalline palladium complexes, six palladium complexes derived from an orthometalated imine, bearing one or two azocarboxylato bridges, have been synthesized: [Pd(2)(μ-SC(10)H(21))(μ-O(2)CAzo)(L(1,2))(2)] (7 and 8), [Pd(2)(μ-SC(10)H(21))(μ-O(2)CAzo3C(10))(L(1,2))(2)]…
Get active: Neutral TaO4 d0 complex is able to cleave dihydrogen heterolytically and spontaneously to form [HTaO(OH)(η2-O2)] in solid argon at cryogenic temperatures. Theoretical calculations predict that the hydrogen atoms in [HTaO(OH)(η2-O2)] can easily be transferred to organic compounds. Thus, TaO4 can serve as a…
We performed electric and thermoelectric transport measurements of bilayer graphene in a magnetic field up to 15 T. The transverse thermoelectric conductivity ${\ensuremath{\alpha}}_{xy}$, determined from four transport coefficients, attains a peak value of ${\ensuremath{\alpha}}_{xy,\text{peak}}$ whenever chemical po…
This work reports an experimental study on the temperature dependence of the structural parameters in orthorhombic ${\text{Eu}}_{1\ensuremath{-}x}{\text{Y}}_{x}{\text{MnO}}_{3}$ system at low temperatures, by using synchrotron x-ray diffraction technique. A significant magnetoelastic coupling is revealed by anomalies…
We examine the energetics of dopants in Si nanocrystals to understand the phenomena of ``self-purification,'' i.e., a process by which extrinsic defects in the interior of a nanocrystal are expelled to the surface. Specifically, we calculate the changes in the total energy of a dopant atom in a Si nanocrystal with res…
We report the bulk self-assembly of diblock copolymer poly( tert -butyl acrylate)- block -poly(glycidyl methacrylate) (P t BA- b -PGMA) with the PGMA that bears many epoxy groups as a cross-linkable segment and the P t BA as a hydrolyzable segment. The P t BA- b -PGMA block copolymers of a different composition were s…
High-frequency (f = 190 GHz) electron paramagnetic resonance (EPR) at magnetic fields up to 12 T and Q-band (f = 34.1 GHz) EPR were performed on single crystals of the molecular wheel CsFe(8). In this molecule, eight Fe(III) ions, which are coupled by nearest-neighbor antiferromagnetic (AF) Heisenberg exchange interac…
The NIR-luminescent ErQ 3 nano-/microstructures have been successfully synthesized through a simple microemulsion route. Various morphologies, including nanorods, bundles, and urchins, have been achieved by tuning the fundamental experimental parameters, such as the organic solvents and the concentration of cetyltrime…
Poor welding strength constitutes an obstacle in the clinical employment of laser-assisted vascular repair (LAVR) and anastomosis. We therefore investigated the feasibility of using electrospun poly(ε-caprolactone) (PCL) scaffold as reinforcement material in LAVR of medium-sized vessels. In vitro solder-doped scaffold…