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Nanoscience and Technology: An International Journal
ESCI SJR: 1.031 SNIP: 1.517 CiteScore™: 0.7

ISSN Print: 2572-4258
ISSN Online: 2572-4266

Nanoscience and Technology: An International Journal

Formerly Known as Nanomechanics Science and Technology: An International Journal

DOI: 10.1615/NanomechanicsSciTechnolIntJ.v5.i1.30
pages 23-31

GENERATION OF ARAGONITE NANOCRYSTALS IN A MAGNETIZED WATER FLOW

Yu. K. Levin
Institute of Applied Mechanics of Russian Academy of Sciences, 7 Leningradsky Ave., Moscow, 125040, Russia

ABSTRACT

It is known that polymorphism of calcium carbonate CaCO3 admits the formation of crystals in three different phases: vaterite, aragonite, and calcite. This work gives explanation of one of the effects noted on magnetization of water flow, i.e., the prevailing composition of a suspension in the form of aragonite nanocrystals. According to the model proposed earlier on the basis of the nanomechanics approaches, a magnetic field accelerates coagulation of nanosized critical nuclei in a supersaturated water flow. Moreover, this process is accompanied by homogeneous generation of new nuclei to sustain their equilibrium concentration. It is shown that in an elementary cell of a crystal the energy of formation increases, whereas the probability of formation decreases in the following succession: vaterite, aragonite, and calcite. However, due to the metastability of the vaterite, the prevailing suspension on a solution turns to be consisting of aragonite crystals that have a smaller surface of the crystalline cell and a higher density than calcite. This supplements the earlier proposed model and explains the well-known experimental results.


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