Materials Literature
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The heat-treatment effect on electronic properties is investigated in relation to structural change for pulsed-laser-deposited amorphous carbon thin films having ${\mathrm{sp}}^{2}{/sp}^{3}$ ratio $\ensuremath{\approx}9.$ The heat treatment at temperatures 200--400 $\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ incre…
Computer simulations of bubble oscillations are performed for various ambient pressures in order to study the mechanism of the ambient-pressure dependence of sonochemical reactions: sonochemiluminescence of aqueous luminol solutions [T. Tuziuti et al., J. Chem. Phys. 116, 6221 (2002)] and the oxidation of iodide [A. H…
Abstract Magnetic and conducting Fe 3 O 4 –polypyrrole nanoparticles with core‐shell structure were prepared in the presence of Fe 3 O 4 magnetic fluid in aqueous solution containing sodium dodecylbenzenesulfonate (NaDS) as a surfactant and dopant. Both the conductivity and magnetization of the composites depend stron…
Au/Pd bimetallic nanoparticles, even with core–shell structure, were synthesized by successive and simultaneous sonochemical irradiation of their metal precursors in ethylene glycol, respectively. In the successive method, Pd clusters or nanoparticles are first obtained by reduction of Pd(NO 3 ) 2 , followed by adding…
The energy level of the exciton around the $Γ$ point in CaF$_2$ at about 11.1 eV was investigated by reflection measurements on oriented surfaces using dispersed synchrotron radiation. A small but clear energy shift of the exciton resonance structure was observed which depends on the crystal orientation with respect t…
Tunneling-induced electronic excitations in a metallic nanograin are classified in terms of {\em generations}: subspaces of excitations containing a specific number of electron-hole pairs. This yields a hierarchy of populated excited states of the nanograin that strongly depends on (a) the available electronic energy…
A complex approach phonon quantum discrete model (PQDM) was developed to describe dynamics, kinetics and statistics of phonons in carbon nanostructures with zero-chirality of both zig-zag and armchair geometry. The model allows include into the pure phonon problem existing interaction with others subsystems: electrons…
We report a study of the structure and electronic properties of a series of thiol-capped Au nanoparticles (NP) of nominal sizes of 1.6, 2.4, and 4.0 nm. Transmission electron microscopy, x-ray powder diffraction, x-ray absorption fine structure, and x-ray photoemission spectroscopy have been used to investigate the si…
We perform density-functional theory (DFT) calculations of carbon dissolution and diffusion in iron, the latter being a typical example of interstitial diffusion. The Kohn-Sham equations are solved with periodic boundary conditions and within the projector-augmented-wave formalism, using the generalized gradient appro…
Magnetic nanoparticles have been proposed for use as biomedical purposes to a large extent for several years. In recent years, nanotechnology has developed to a stage that makes it possible to produce, characterize and specifically tailor the functional properties of nanoparticles for clinical applications. This has l…
This review is focused on describing state-of-the-art synthetic routes for the preparation of magnetic nanoparticles useful for biomedical applications. In addition to this topic, we have also described in some detail some of the possible applications of magnetic nanoparticles in the field of biomedicine with special…
Abstract The copolymerization of 1,5‐dioxepan‐2‐one (DXO) and ε‐caprolactone, initiated by a five‐membered cyclic tin alkoxide initiator, was performed in chloroform at 60 °C. Copolymers with different molar ratios of DXO (25, 40, and 60%) were synthesized and characterized. 13 C NMR spectroscopy of the carbonyl regio…
Abstract Vegetable fibers are being used as reinforcements in polymeric matrices with a wide variety of applications. Among these fibers, sisal is of particular interest due to the high impact strength and moderate tensile and flexural properties of its derivated composites. Because of its low cost and affinity, a phe…
The synthesis of a nanocomposite material composed of anionic poly(phenylene ethynylene) (aPPE) polymer particles and ZnS/Mn 2+ nanoparticles is described, and its luminescence properties are investigated. aPPE particles have two emissions, one in the blue (460 nm) and the other in the green (490 nm), that are assigne…
Unrestricted Hartree-Fock calculations on ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.5$ and $x=0.67)$ in the full magnetic unit cell show that the magnetic ground states of these compounds consist of ``ferromagnetic molecules'' or polarons ordered in herring-bone patterns. Each polaron…
Abstract The cyclic phosphorous group, 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide‐10‐yl (DOPO), attached on a polyamide PA–DOPO could be hydrated to give its open‐chained form with phosphinic acid groups (PA–DOPO–HD). The open‐chained phosphinic acid groups could be reformed to its cyclic DOPO form through the…
Abstract Polymerization of benzoguanamine (BGA) and 2,4‐tolylenediisocyanate (TDI), BGA–TDI polycondensation polyurea (PU), and pyromellitic dianhydride (PMDA) in solid phase under microwave radiation was studied. In the system of TDI and BGA, the effect of microwave radiation time, the composition and concentration o…
A new integrated electrochemical and transmission optical microscopy approach is presented which allows for elucidation of inhomogeneous ion/charge-transfer behavior in polycrystalline electrochromic/insertion materials. Spatially resolved Li+ diffusion coefficients and ionic conductivities are determined from the tim…
An in situ study of solution crystallization kinetics and morphology of the long alkane n -C 246 H 494 has been performed by interference optical microscopy using a T -jump hot stage. The crystallization temperatures ( T c ) covered the full range of extended-chain and part of the once-folded chain range. A drastic ch…
Taking advantage of the weak attraction forces between gold surface and silica zeolite colloids, selective growth of zeolite on silicon wafer over gold was exploited to fabricate continuous micropatterned b-oriented zeolite MFI monolayer film with excellent adhesion.