Chemically Prepared Magnetic Nanoparticles
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Morphology, thermal, and mechanical properties of vinylester resin nanocomposites with various organo‐modified montmorillonites
Abstract New nanocomposites based on a vinylester resin (VER) and the organo‐montmorillonites (ODA‐M, BHL‐M, DEM‐M, BHLV‐M) modified with octadecylammonium, bis(2‐hydroxyethyl)lauryl ammonium, diethyl[2‐(methacryloyloxyl)ethyl]ammonium, and bis(2‐hydroxyethyl)lauryl(vinylbenzyl)‐ammonium chlorides, respectively, were…
Crystallographic structure and magnetic ordering inCaMn1−xRuxO3(x⩽0.40)manganites: Neutron diffraction, ac susceptibility, and electron magnetic resonance studies
Neutron powder diffraction (NPD), ac susceptibility and electron magnetic resonance (EMR) techniques were employed for studying the crystallographic structure and magnetic ordering in $\mathrm{Ca}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{3}$ $(x\ensuremath{\leqslant}0.40)$ manganite system. It is…
Application of renormalization and convolution methods to the Kubo-Greenwood formula in multidimensional Fibonacci systems
Based on the Kubo formalism, electronic transport in macroscopic quasiperiodic systems is studied by means of an efficient renormalization method, and the convolution technique is used in the analysis of two- and three-dimensional lattices. For the bond problem, we found a transparent state located at a center of self…
Optimizing the response of Schottky barrier position sensitive detectors
One of the key criteria in measuring the effectiveness of position sensitive detectors (PSDs) is that of sensitivity—how large an electrical signal can be produced for a given change in the incident light position. The larger the signal produced, then the less additional electronics for amplification required. In this…
Effect of Pretreatment Variables on the Reaction of Nitric Oxide (NO) with Au−TiO2: DRIFTS Studies
The effect of the pretreatment on the interaction between NO and Au−TiO 2 was examined using DRIFTS as a monitoring tool. For calcined and reduced Au−TiO 2, adsorption of NO on the TiO 2 support is not promoted under the conditions employed. Au(NO) 2 is the predominant species on oxidized and reduced Au−TiO 2 with ini…
Radiation damage effects in the perovskiteCaTiO3and resistance of materials to amorphization
We combine classical and quantum-mechanical simulations to study the structural changes in $\mathrm{Ca}\mathrm{Ti}{\mathrm{O}}_{3}$ under irradiation. We identify common defects, and suggest that their stability is related to the covalent character of Ti-O bonding. We address the issue of resistance to amorphization b…
Photoconductivity and optical properties in composites of poly(paraphenylene vinylene) and single-walled carbon nanotubes
We present photoconductivity and Raman scattering data obtained from composite films of poly(paraphenylene vinylene) (PPV) and single-walled carbon nanotubes at different weight concentrations from 0% to 64%. It is found that the introduction of nanotubes in the PPV precursor polymer solution, heated at $300\ifmmode^\…
Effect of high pressure on thePb(Mg1∕3Nb2∕3)O3−PbTiO3solid solution: A Raman scattering investigation
We report a high-pressure Raman scattering investigation of $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ $(\mathrm{PMN}\text{\ensuremath{-}}{\mathrm{PT}}_{x})$, which is considered as a prototype relaxor-based piezoe…
Scaling behavior of the proton spin-lattice relaxation rate in antiferromagnetic molecular rings
We present new and refined data for the magnetic field $(H)$ and temperature $(T)$ dependence of the proton spin-lattice relaxation rate $(1∕{T}_{1})$ in antiferromagnetic molecular rings as well as a new explicit scaling formula that accurately reproduces our data. The key ingredients of our formulation are (1) a red…
Impact of radiation defects on the structural stability of pure zirconia
Optical spectroscopy and x-ray diffraction were used to study the behavior of polycrystalline samples of pure monoclinic zirconia irradiated by low energy ions. A microscopic model based on these experiments is proposed to explain the displacive phase transition observed in this material after irradiation. Defects, pr…
Growth, microstructure, and magnetic properties of highly textured and highly coercive Nd-Fe-B films
Thin Nd-Fe-B films have been prepared by pulsed laser deposition on sapphire substrates. A Ta buffer layer has been used to promote epitaxial growth. The deposition temperature has been varied between 400 \ifmmode^\circ\else\textdegree\fi{}C and 700 \ifmmode^\circ\else\textdegree\fi{}C and proved to be an important pa…
The structure and properties of PA6/MMT nanocomposites prepared by melt compounding
Abstract Polyamide 6 (PA6)/organo‐montmorillonite nanocomposites prepared by melt compounding using a co‐rotating twin‐screw extruder were intercalated nanocomposites. The modulus, bending strength and heat distortion temperature of these nanocomposites increased with increasing clay content, and tensile strength incr…
Computational Modeling of Di-Transition-Metal-Substituted γ-Keggin Polyoxometalate Anions. Structural Refinement of the Protonated Divacant Lacunary Silicodecatungstate
The B3LYP density functional method has been validated for the di-Mn-substituted gamma-Keggin polyoxometalate (POM) anion, [(SiO4)MnIII2(OH)2W10O32]4-, and for the divacant lacunary silicodecatungastate, gamma-[(SiO4)W10O32]8-. This approach was shown to adequately describe the geometries of [(SiO4)MnIII2(OH)2W10O32]4…
Evaluation of the BEASY program using linear and piecewise linear approaches for the boundary conditions
Abstract The boundary element method (BEM) was used to study galvanic corrosion using linear and logarithmic boundary conditions. The linear boundary condition was implemented by using the linear approach and the piecewise linear approach. The logarithmic boundary condition was implemented by the piecewise linear appr…
An Integrated Approach Combining Reaction Engineering and Design of Experiments for Optimizing Reactions
A certain number of reactions in the organic synthesis pose serious scale-up problems; on the other hand, other reactions create safety issues that must be addressed early during process development. The following work shows a statistical analysis of different reactions in terms of kinetics and phases (solid−liquid−ga…
Dissolution of Hydrogen-Bonded Polymers in Water: A Study of Nylon-4,6
Communication to the Editor - No abstract
Double doping effect on the structural and dielectric properties of PZT ceramics
Polycrystalline samples of the modified Pb(Zr 1− x Ti x )O 3 (PZT) composition, with representative formula Pb 0.92 (La z Bi 1− z ) 0.08 (Zr 0.65 Ti 0.35 ) 0.98 O 3 (PLBZT), a family of relaxor ferroelectrics, were prepared via the chemical route with z = 0.3, 0.6 and 0.9. Crystalline phases of powders calcined at dif…
Recent Advances in the Liquid‐Phase Syntheses of Inorganic Nanoparticles
Abstract For Abstract see ChemInform Abstract in Full Text.
Homoleptic Cobalt and Copper Phenolate A2[M(OAr)4] Compounds: The Effect of Phenoxide Fluorination
Two series of homoleptic phenolate complexes with fluorinated aryloxide ligands A2[M(OAr)4] with M=Co2+ or Cu2+, OAr-=(OC6F5)- (OArF) or [3,5-OC6H3(CF3)2]- (OAr'), A+=K (18-crown-6)+, Tl+, Ph4P+, Et3HN+, or Me4N+ have been synthesized. Two related complexes with nonfluorinated phenoxide ligands have been synthesized a…