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Mechanochemistry
Mechanochemistry or mechanical chemistry is the coupling of mechanical and chemical phenomena on a molecular scale and includes mechanical breakage, chemical behaviour of mechanically stressed solids (e.g., stress-corrosion cracking or enhanced oxidation), tribology, polymer degradation under shear, cavitation-related phenomena (e.g., sonochemistry and sonoluminescence), shock wave chemistry and physics, and even the burgeoning field of molecular machines. Mechanochemistry can be seen as an interface between chemistry and mechanical engineering. It is possible to synthesize chemical products by using only mechanical action. The mechanisms of mechanochemical transformations are often complex and different from usual thermal or photochemical mechanisms.〔Carlier L. & al. , Greener pharmacy using solvent-free synthesis: investigation of the mechanism in the case of dibenzophenazine, Powder Technol. 2013, 240, 41-47.〕 The method of ball milling is a widely used process in which mechanical force is used to achieve chemical processing and transformations.〔Carlier L. & al. , Use of co-grinding as a solvent-free solid state method to synthesize dibenzophenazines, Tetrahedron Let. 2011, 52, 4686-4689.〕 The special issue of Chemical Society Review (vol. 42, 2013) is dedicated to the theme of mechanochemistry. Fundamentals and applications ranging from nano materials to technology have been reviewed.〔Hallmarks of mechanochemistry: from nanoparticles to technology, Peter Baláž, Marcela Achimovičová,Matej Baláž, Peter Billik, Zara Cherkezova-Zheleva, José Manuel Criado, Francesco Delogu, Erika Dutková, Eric Gaffet, Francisco José Gotor, Rakesh Kumar, Ivan Mitov, Tadej Rojac, Mamoru Senna, Andrey Streletskiikl and Krystyna Wieczorek-Ciurowam, Chem. Soc. Rev., 2013,42, 7571-7637, (DOI: 10.1039/C3CS35468G )〕 The mechanochemical process was used recently as a green one to synthesize pharmaceutically attractive phenol hydrazones.〔Oliveira P.F.M., Baron M., Chamayou A., André-Barrès C., Guidetti B., Baltas M., Solvent-free mechanochemical route for green synthesis of pharmaceutically attractive phenol-hydrazones, RSC Adv. (2014), 4, 56736-56742, doi: 10.1039/c4ra10489g〕
The term mechanochemistry is sometimes confused with mechanosynthesis, which refers specifically to the machine-controlled construction of complex molecular products.〔(【引用サイトリンク】title=Technology Roadmap for Productive Nanosystems )〕
Mechanochemical phenomena have been utilized since time immemorial, for example in making fire. The oldest method of making fire is to rub pieces of wood against each other, creating friction and hence heat, allowing the wood to undergo combustion at a high temperature. Another method involves the use of flint and steel, during which a spark (a small particle of pyrophoric metal) spontaneously combusts in air, starting fire instantaneously.
==References==
Lenhardt, J. M.; Ong, M. T.; Choe, R.; Evenhuis, C. R.; Martinez, T. J.; Craig, S. L., Trapping a Diradical Transition State by Mechanochemical Polymer Extension. Science 2010, 329 (5995), 1057-1060
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