Combined Microwaves/Ultrasound, a Hybrid Technology
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The combination of microwave heating and ultrasound irradiation has been successfully exploited in applied chemistry. Besides saving energy, these green techniques promote faster and more selective transformations. The aim of this review is to provide a practical overview of the complimentary and synergistic effects generated by the combination of microwaves and either ultrasound or hydrodynamic cavitation. This will begin with a brief history, as we outline pioneering achievements, and will also update the reader on recent developments. Such hyphenated techniques are able to offer reliable and efficient protocols for basic chemistry, organic and inorganic synthesis as well as processing. The development of dedicated hybrid reactors has helped scientists to find solutions to new synthetic challenges in the preparation of nanomaterials and new green catalysts. This research topic falls within the confines of process intensification as it facilitates the design of substantially cleaner, safer and more energy efficient technologies and chemical processes.
KeywordsMicrowaves Ultrasound Enabling technologies Hybrid reactors Synergistic effects
The University of Turin is warmly acknowledged for its financial support (Fondi Ricerca Locale 2015).
- 1.Maeda M, Amemiya H (1995) Chemical effects under simultaneous irradiation by microwaves and ultrasound, New. J Chem 19:1023–1028Google Scholar
- 4.Cintas P, Cravotto G, Canals A (2012) Combined ultrasound-microwave technologies, in Handbook on Applications of Ultrasound: Sonochemistry for Sustainability. CRC Press, Boca Raton, pp 659–673Google Scholar
- 6.Cravotto G, Garella D, Calcio Gaudino E, Lévêque JM (2008) Microwaves-ultrasound coupling: a tool for process intensification in organic synthesis. Chem Today 26:39–41Google Scholar
- 13.Cravotto G, Rinaldi L, Carnaroglio D (2015) Efficient Catalysis by combining Microwaves with other enabling Technologies, Chapt. 8 in Microwaves in Catalysis Ed. Horikoshi S, Serpone N, Wiley-VCH Verlag GmbH & Co. KGaA Boschstr. 12, 69469 Weinheim, GermanyGoogle Scholar
- 17.Ardebili SMS, Hashjin TT, Ghobadian B, Najafi G, Mantegna S, Cravotto G (2015) Optimization of biodiesel synthesis under simultaneous ultrasound-microwave irradiation using response surface methodology (RSM). Green Process Synth 4:259–267Google Scholar
- 31.Boffa L, Tagliapietra S, Cravotto G (2013) Combined energy sources in the synthesis of nanomaterials in Microwaves 55–74. Chapt. 4 in Nanoparticle Synthesis—Fundamentals and Applications. Ed. Horikoshi S, Serpone N, Wiley-VCH Verlag GmbH & Co. KGaA Boschstr. 12, 69469 WeinheimGoogle Scholar
- 34.Cravotto G, Boffa L (2014) Combined Ultrasound-Microwave irradiation for the preparation of nanomaterials, 203–226. Chapt. 7. In: Sivakumar M, Ashokkumar M (eds.) Cavitation—a novel energy efficient technique for the generation of nanomaterials. Pan Stanford Publishing Pte Ltd., eBook ISBN: 978-981-4411-55-4Google Scholar
- 42.Madiraju VA, Taneja K, Kumar M, Seelaboyina R (2016) CZTS synthesis in aqueous media by microwave irradiation. J Mater Sci: Mater Electron 27:3152–3157Google Scholar
- 46.Si W, Ding C, Ding S (2014) Synthesis and characterization of YAG nanoparticles by ultrasound-assisted and ultrasound-microwave-assisted alkoxide hydrolysis precipitation methods. J Nanomater 2014:8, Art ID 408910. doi: 10.1155/2014/408910