Materials Literature
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Fe2O3 nanoparticles were synthesized by co-precipitation method and different concentrations (6 and 10 wt%) of it were dispersed in a poly (methyl methacrylate) (PMMA) matrix, through a soft chemical casting method. These films were irradiated with 50 MeV Li+3 ions at a fluence of 5 × 1012 ions/cm2. Dependence of diel…
K. Ramesha, M. Prashanthaa, N. Koteeswara Reddyb & E. S. R. Gopala a Department of Physics , Indian Institute of Science , Bangalore, 560012 b School of Chemistry , Tel Aviv University , Tel Aviv, 69978, Israel Nanostructured carbon nitride films were prepared by pyrolysis assisted chemical vapour deposition. A two zo…
The condition for a negative index of refraction with respect to the vacuum index is established in terms of permittivity and permeability susceptibilities. It is found that the imposition of analyticity to satisfy the Kramers-Kronig relations is a sufficiently general criterion for a physical negative index. The sati…
Geometric control of copper nanoparticles was attempted with nonionic microemulsions containing tetrabutylammonium hydroxide (TBAOH). By using copper(II) salts as precursors, metallic anisotropic Cu nanoparticles were obtained via a two-step chemical reaction. Corresponding plasmon resonances were monitored under diff…
Capacitors are the most convenient and economical devices for storage of electrical energy. Performance of a capacitor is primarily governed by solid-state characteristics of its dielectric material and the explicit value of the dielectric constant. Titanate ceramics such as Barium Titanate are popular capacitor diele…
A major concern in operating a diesel engine is how to reduce the soot emission from the exhaust gases, as soot has a negative effect on both human health and the environment. More stringent emission regulations make the diesel particulate filter (DPF) an indispensable after-treatment component to reduce diesel soot f…
We used picosecond transient absorption and fluorescence lifetime spectroscopy to study singlet exciton annihilation and depolarization in self-assembled aggregates of meso-tetra(4-sulfonatophenyl)porphine (TPPS(4)) and a synthetic 22-residue polypeptide. The polypeptide was designed and previously shown to bind three…
We report a novel method for fabricating silver nanoparticle assemblies with a featured gradient of spatial organizations. The unique step is to generate a gradient of deposit mass by dynamical deposition on a mask-covered substrate with a collimated cluster beam in oblique incidence. Then such gradient can be transla…
Etching of the GaAs(100) surface with aqueous ammonia solution is studied by highly surface-sensitive synchrotron-radiation photoemission spectroscopy. It is shown that such treatment effectively removes the native oxide layer leaving the surface covered with elemental arsenic, as well as arsenic hydroxides AsOH and A…
Electroless plating of Ni—P, Cu, Ag, and Cu—Ag on polyamide fabric was performed in the laboratory. The coating depositions were characterized by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy, thermal gravimetric analysis, and X-ray diffraction analysis, respectively. The flame retardancy, a…
We demonstrate diameter-dependent, progressive alkylcarboxylation of single-walled carbon nanotubes by recycling a modified Billups-Birch reaction. The strong diameter dependence was confirmed by Raman spectroscopy. Alkylcarboxylation made SWNTs soluble in water, allowing the more readily functionalized, smaller diame…
We have measured the spin-polarized electron momentum density distributions of EuFe2(As0.73P0.27)2 by magnetic Compton scattering (MCS) measurements. For the first time, we show direct evidence of competing ferromagnetism and superconductivity (SC) on FeAs layers in this iron pnictide system. The MCS orbitalwise decom…
Spinel-type Co3O4 nanopyramids grown by CVD starting from Co(hfa)2•TMEDA display attractive features for hydrogen production by photo-reforming of methanol solutions, especially in the presence of oxygen in the reaction medium. To the best of our knowledge, this is the first example of photo-activated H2 generation by…
This Article addresses the important issue of the characterization of surface functional groups for optical bioassay applications. We use a model system consisting of spherical dye-doped silica nanoparticles (NPs) that have been functionalized with amine groups whereby the encapsulated cyanine-based near-infrared dye…
A facile solution process for the preparation of anisotropic silica nanoparticles (ASNPs) is presented. ASNPs are prepared via controlled self-assembly of spherical silica seeds (22 nm) in alcohol-water mixed media, followed by their in situ fixation and overgrowth with tetraethoxysilane (TEOS). Ethanol and L-arginine…
(1-x)PVDF-xBaTiO3 ceramic-polymer composites with x = 0.10, 0.20, 0.30 were prepared using melt growth technique. The crystal symmetry, space group and unit cell dimensions were determined from the XRD data of BaTiO3 using FullProf software, whereas crystallite size and lattice strain were estimated through Williamson…
Elastic properties of the face and core layers of commercial three-layer particleboards were examined. The method of compressing the block specimens glued from strips of layers separated from boards, and measuring specimen deformations by the electric resistance strain gauge technique was used. The layers were assumed…
In the present work, the effect of partial substitution of barium by calcium in Ba5NdTi3Nb7O30 has been investigated. The samples were synthesized by solid state reaction method and studied for their structural, dielectric, conductivity and ferroelectric properties. The X-ray diffractograms confirm the formation of si…
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Abstract Anionically charged fluorescent conjugated polyelectrolytes of poly{[4,7‐(2,1,3‐benzothiadiazole)‐alt‐1,4‐phenylene]‐co‐[2,5‐bis(4‐sulfonatobutoxy)‐alt‐1,4‐phenylene]} (P1) and poly{[4,7‐(bis(thiophen‐2‐yl)benzo‐2,1,3‐thiadiazole)‐alt‐1,4‐phenylene]‐co‐[2,5‐bis(4‐sulfonatobutoxy)‐alt‐1,4‐phenylene]} (P2) were…