Nanostructured Materials Synthesis Using Ultrasound

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

“…Ultrasound and microwave irradiations, ball milling and sonophotodeposition, to name a few strategies, represent innovative technologies to the conventional solid-state, wet chemistry and gas phase synthesis procedures. Many review articles can be found in the literature, offering a comprehensive discussion on the matter [57][58][59][60][61]. Here, through a few selected examples, we wish to highlight the advantages of using ultrasound, ball milling, sonophotodeposition and sonoelectrodeposition in the synthesis of solid catalysts (and photocatalysts) for the selective oxidation of alcohols to the corresponding aldehydes or carboxylic acids.…”

Sonochemical catalysis as a unique strategy for the fabrication of nano-/micro-structured inorganics

“…Accompanied by the sonochemical consequences, the acoustic cavitation in a liquid often gives rise to numerous physical and/or mechanical effects including simple heating, shock waves and microjets (Figure 3), which can also affects the efficiency of sonochemical reactions. [32] Heating during the sonication is readily understood because tens or more of watts of acoustic energy will be delivered into the liquid, so ultrasound can be useful for activating the reactions. A microjet in a liquid is often created in any heterogeneous system, since the asymmetrical collapse of highly energetic bubbles usually induces the surroundings to form a doughnut-like shape.…”

“…Furthermore, many technologies such as sonofragmentation and ultrasonic spray pyrolysis, have been developed to produce nanostructured materials on account of the physical or mechanical effects from the ultrasound. [124] In sonication, a few layered materials such as MoSe 2 , MoS 2 , WS 2 and Bi 2 Te 3 , can prepare single-layered nanosheets by the direct liquid-phase exfoliation, which is actually a response from sonofragmentation. [125] Suslick et al have prepared MnO 2 microspheres via an ultrasonic spray pyrolysis process, where the KMnO 4 and HCl mixed solution was nebulized into micro-sized droplets serving as one microreactor and produced the microspheres upon heating.…”

SYNTHESIS OF Ag2O/CNTs NANOCOMPOSITE TO BE USED AS A CATHODE MATERIAL FOR ZINC - SILVER BATTERIES

“…Enhanced electrochemical properties have been found for this nanocomposite such as the stable cycle, increased current density and directional application in zinc-silver batteries [8][9][10].…”