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Analytical sonochemistry; developments, applications, and hyphenations of ultrasound in sample preparation and analytical techniques

100%
Seidi S., Yamini Y.
Open Chemistry
|
2012
|
vol. 10
|
issue 4
938-976
EN
Ultrasonic assistance is one of the great successes of modern analytical chemistry, which uses this energy for a variety of purposes in relation to sample preparation and development of methods for the analysis of numerous contaminants including organic and inorganic compounds. This review will attempt to provide an overview of more recent applications of ultrasound in different environmental and biological samples such as food, soil and water as well as a brief description of the theoretical understanding of this method. Also, the possibility of coupling ultrasound with other analytical techniques will be discussed. [...]
2
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Sonochemical synthesis and chracterization of Mn3O4 nanoparticles

88%
Baykal A., Kavas H., Durmuş Z., Demir M., Kazan S., Topkaya R., Toprak M.
Open Chemistry
|
2010
|
vol. 8
|
issue 3
633-638
EN
We report on the synthesis of Mn3O4 nanoparticles (NPs) using a novel sonochemical method without requiring any pH adjustment. Synthesized material was identified as tetragonal hausmannite crystal structure model of Mn3O4 from XRD analysis. Crystallite size was estimated from x-ray line profile fitting to be 17±5 nm. FTIR analysis revealed stretching vibrations of metal ions in tetrahedral and octahedral coordination confirming the crystal structure. TEM analysis revealed a dominantly cubic morphology of NPs with an average size of ∼20 nm. Magnetic evaluation revealed a blocking temperature, T B of 40 K above which the material behaves paramagnetic. Asymmetric coercive field is attributed to the interaction between ferromagnetic Mn3O4 and antiferromagnetic Mn oxide at the surface of nanoparticles. [...]
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