Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Synthesis of metal oxides

Raney, J.R., et al., In situ synthesis of metal oxides in carbon nanotube arrays and mechanical properties of the resulting structures. Carbon, 2012. 50(12) p. 4432-4440. [Pg.166]

Fig. 5.1 Template (organogelator) synthesis of metal oxide nanotubes. Fig. 5.1 Template (organogelator) synthesis of metal oxide nanotubes.
Since the first synthesis of mesoporous materials MCM-41 at Mobile Coporation,1 most work carried out in this area has focused on the preparation, characterization and applications of silica-based compounds. Recently, the synthesis of metal oxide-based mesostructured materials has attracted research attention due to their catalytic, electric, magnetic and optical properties.2 5 Although metal sulfides have found widespread applications as semiconductors, electro-optical materials and catalysts, to just name a few, only a few attempts have been reported on the synthesis of metal sulfide-based mesostructured materials. Thus far, mesostructured tin sulfides have proven to be most synthetically accessible in aqueous solution at ambient temperatures.6-7 Physical property studies showed that such materials may have potential to be used as semiconducting liquid crystals in electro-optical displays and chemical sensing applications. In addition, mesostructured thiogermanates8-10 and zinc sulfide with textured mesoporosity after surfactant removal11 have been prepared under hydrothermal conditions. [Pg.383]

Fig. 3. Schematic of a typical hydrodynamic cavitation synthesis of metal oxides starting with a metal salt solution, which is precipitated and processed in a cavitating stream of bubbles. Fig. 3. Schematic of a typical hydrodynamic cavitation synthesis of metal oxides starting with a metal salt solution, which is precipitated and processed in a cavitating stream of bubbles.
D. Synthesis of Metal Oxide Catalysts and Supported Metals... [Pg.27]

Hydrothermal synthesis is often applied to the preparation of oxides. The synthesis of metal oxides in hydrothermal conditions is believed to occur in a two-step process. In the first step, there is a fast hydrolysis of a metal salt solution to give the metal hydroxides. During the second step, the hydroxide is dehydrated, yielding the metal oxide desired. The overall rate is a function of the temperature, the ion product of water, and the dielectric constant of the solvent. The two steps are in balance during the reaction. The hydroxide of the metal salt is favored by a high dielectric constant, while the dehydration of the metal hydroxide is favored by a low dielectric constant. Since the fast reaction is the first step, it is expected that as one approaches supercritical conditions, the rate of reaction increases. [Pg.172]

Sui R, Charpentier P. Synthesis of metal oxide nanostructures by direct Sol-Gel chemistry in supercritical fluids. Chemical Reviews. 2012 112(6) 3057-3082. [Pg.306]

Another more recent strategy that we developed is the synthesis of metal oxide nanoparticles from the simple reaction of interdendritic stabilized basic metalate salts... [Pg.314]

Solvothermal techniques have been extensively developed for the synthesis of metal oxides [149-152]. Unlike many other synthetic techniques, solvothermal synthesis concerns a much milder and softer chemistry conducted at low temperatures. The mild and soft conditions make it possible to leave polychalcogen building-blocks intact while they reorganize themselves to form various new structures, many of which might be promising for applications in catalysis, electronic, magnetic, optical and thermoelectronic devices [153-155]. They also allow the formation and isolation of phases that may not be accessible at higher temperatures because of their metastable nature [156, 157]. [Pg.633]

This method has been successfully applied for the synthesis of metals, metal oxides, alloys and core-shell nanoparticles. The synthesis of metal oxides from reverse micelles is similar in most aspects to their synthesis in aqueous phase by a precipitation process. For example, precipitation of hydroxides is obtained by addition of a base such as NH3(aq) or NaOH to a reverse micelle solution... [Pg.637]

For the preparation of inorganic materials with well-defined morphologies, liquid phase syntheses are preferred. These synthetic reactions proceed at relatively lower temperatures and therefore require lower energies. The sol-gel (alkoxide) method is one of these methods - however, this method usually gives amorphous products, and calcination of the products is required to obtain crystallized products. In this chapter, solvothermal methods are dealt with, which are convenient for the synthesis of a variety of inorganic materials. General considerations for solvothermal reactions are discussed first and then the solvothermal synthesis of metal oxides is reviewed. [Pg.289]

Hydrothermal synthesis of metal oxides from the corresponding hydroxides usually requires high temperatures because of the limitations of equilibrium ... [Pg.298]

Addition of Complexing Agents. Complexation of metallic centers in the precursors by various chelating agents such as acetylacetone, ethylene glycol, and triethanolamine allows the control of the hydrolysis and condensation reactions of the inorganic precursors in the synthesis of metal oxides. Alternately, surfactants with a complexing ability can also be used. [Pg.1830]

E.Yohannes, D. Powell, Metal oxide clusters as building blocks for the synthesis of metal oxide surfaces and framework materials synthesis and x-ray crystal structure of [MniV 9H6046(H20)i2] GOHiO. Inorg. Chem., 38 212.(1999). (c) M. I. Khan, E. Yohannes, and R. J. Doedens, Metal oxide based framework materials composed of polyoxovanadate clusters synthesis and x-ray crystal structures of [M3V 8042(H20) 2(X04)]-24H20 (M = Fe, Co X = V, S),Angew. Chem. Int. Ed Engl. 38 1292 (1999). [Pg.37]

Gas Phase Synthesis of Metal Oxide Monolithic Catalysts for Hydrocarbon Deep Oxidation... [Pg.625]

Gas phase synthesis of metal oxide monolithic catalysts for hydrocarbon. [Pg.627]

A large number of binary ceramics such as carbides, nitrides, and oxides have been obtained by the decomposition of metal-organic precursors. The following text presents some selected examples to demonstrate the promises and limitations of molecular precursor approach. A complementary account of the synthesis of metal oxide nanoparticles from solution-based methods is given in Chapter 12.03. [Pg.51]


See other pages where Synthesis of metal oxides is mentioned: [Pg.370]    [Pg.367]    [Pg.119]    [Pg.261]    [Pg.85]    [Pg.125]    [Pg.130]    [Pg.1]    [Pg.209]    [Pg.296]    [Pg.19]    [Pg.4]    [Pg.446]    [Pg.620]    [Pg.90]    [Pg.288]    [Pg.298]    [Pg.298]    [Pg.319]    [Pg.323]    [Pg.245]    [Pg.157]    [Pg.157]    [Pg.61]    [Pg.63]    [Pg.65]    [Pg.67]   
See also in sourсe #XX -- [ Pg.420 ]




SEARCH



Bacterial Synthesis of Metal Oxide Nanomaterials

Biomimetic Synthesis of Metal Oxide Nanomaterials

Metal oxides, synthesis

SYNTHESIS OF COMPLEX OXIDES FROM METAL ALKOXIDES

Synthesis of High-Surface-Area Alkaline Earth Metal Oxides

Synthesis of Organically Modified Transition Metal Oxide Clusters

Synthesis of metal oxide nanocrystals

Synthesis of solvento-complexes by metal oxidation in non-aqueous solvents

The Biomimetic Synthesis of Metal Oxide Nanomaterials

© 2024 chempedia.info