Core/Shell Nanoparticles: Classes, Properties, Synthesis Mechanisms, Characterization, and Applications

In this chapter, we will restrict our attention to the ferrites and a few other closely related materials. The great interest in ferrites stems from their unique combination of a spontaneous magnetization and a high electrical resistivity. The observed magnetization results from the difference in the magnetizations of two non-equivalent sub-lattices of the magnetic ions in the crystal structure. Materials of this type should strictly be designated as “ferrimagnetic” and in some respects are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present. We shall not adhere to this special nomenclature except to emphasize effects, which are due to the existence of the sub-lattices.

Ferromagnetic materials

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Metal–Organic Frameworks and Self-Assembled Supramolecular Coordination Complexes: Comparing and Contrasting the Design, Synthesis, and Functionality of Metal–Organic Materials

Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.

X-Ray Diffraction

The applications of copper (Cu) and Cu-based nanoparticles, which are based on the earth-abundant and inexpensive copper metal, have generated a great deal of interest in recent years, especially in the field of catalysis. The possible modification of the chemical and physical properties of these nanoparticles using different synthetic strategies and conditions and/or via postsynthetic chemical treatments has been largely responsible for the rapid growth of interest in these nanomaterials and their applications in catalysis. In addition, the design and development of novel support and/or multimetallic systems (e.g., alloys, etc.) has also made significant contributions to the field. In this comprehensive review, we report different synthetic approaches to Cu and Cu-based nanoparticles (metallic copper, copper oxides, and hybrid copper nanostructures) and copper nanoparticles immobilized into or supported on various support materials (SiO2, magnetic support materials, etc.), along with their applications i...

http://pubs.acs.org/doi/pdfplus/10.1021/acs.chemrev.5b00482

Cu and Cu-Based Nanoparticles: Synthesis and Applications in Catalysis.

Thermal decomposition of [bis(salicylaldehydato)cadmium(II)] to CdS nanocrystals

In this study, the effect of vanadium addition on the structural and magnetic properties of cobalt ferrite (Co1−xVxFe2O4; where x = 0, 0.05, 0.10, 0.15, 0.20, and 0.25) prepared by a novel sol–gel autocombustion method was investigated. The formation of cubic spinel structure (space group Fd3m) was confirmed by X-ray diffraction in combination of Rietveld structure refinement analysis and transform infrared spectroscopic spectrum (FT-IR) analyses. Also, phase and elemental analyses confirmed that an inevitable secondary phase of hematite along with the spinel phase appears by addition of vanadium; therefore, a nanocomposite was formed in the sample containing vanadium. However, the SEM observations in combination of the results obtained by Rietveld structure refinement analysis showed that the presence of vanadium can affect the size of synthesized cobalt ferrite. VSM measurements showed that saturation magnetization and coercivity values are strongly dependent on the vanadium content and particle size, so that the maximum value of coercivity was obtained equal to ~916 Oe for Co0.85V0.15Fe2O4.

The possibility of vanadium substitution on Co lattice sites in CoFe2O4 synthesized by sol–gel autocombustion method

In this research, with the aim of engineering arrangement of nanoparticles within membrane pores, ZrO2 nanoparticles was modified by sulfate and carboxylate functional groups. Thereafter, the filtr...

Engineering arrangement of nanoparticles within nanocomposite membranes matrix: a suggested way to enhance water flux

Cu(II) complexes of 14- and 16-membered tetraaza macrocyclic ligands have been encapsulated in nanopores of zeolite-Y by a two-step process in the liquid phase: (1) adsorption of [bis(diamine)copper(II)] (diamine = 1,2-diaminoethane, 1,3-diaminopropane, 1,2-diaminobenzene, and 1,3-diaminobenzene); [Cu(N–N)2]2+–NaY; in the nanopores of the zeolite-Y and (2) in situ condensation of the copper(II) precursor complex with ethylcinnamate. The new host–guest nanocomposite materials were characterized by chemical analysis and spectroscopic methods. The “neat” and encapsulated complexes exhibit good catalytic activity in the oxidation of ethylbenzene at 333 K, using tert-butyl hydroperoxide as the oxidant. Acetophenone was the major product though small amounts of o- and p-hydroxyacetophenones were also formed revealing that C–H bond activation takes place both at benzylic and aromatic ring carbon atoms.

Synthesis, characterization, and catalytic oxidation of ethylbenzene over host (zeolite-Y)/guest (copper(II) complexes of tetraaza macrocyclic ligands) nanocomposite materials

Abstract A modified sol-gel synthesis route has been used to prepare the fine homogeneous powder of Sr2CuO3 ceramic using strontium nitrate, copper nitrate, diethylene glycol monobutyl ether and citric acid. XRD patterns showed that the temperature of forming Sr2CuO3 is about 900°C and single phase of Sr2CuO3 with high purity obtains at 950°C. Influence of concentration of citric acid on the structure of prepared materials was investigated by SEM images.

Fatemeh Davar

Papers

Thermal decomposition of [bis(salicylaldehydato)cadmium(II)] to CdS nanocrystals

The possibility of vanadium substitution on Co lattice sites in CoFe2O4 synthesized by sol–gel autocombustion method

Engineering arrangement of nanoparticles within nanocomposite membranes matrix: a suggested way to enhance water flux

Synthesis, characterization, and catalytic oxidation of ethylbenzene over host (zeolite-Y)/guest (copper(II) complexes of tetraaza macrocyclic ligands) nanocomposite materials

Synthesis and Characterization of the One-dimensional Cuprate Sr2CuO3 Nanoparticles Prepared by Modified Sol-gel Method