RT Journal Article
ID 46633d5203495fe8
A1 Koshoridze, Semen I.
A1 Levin, Yu. K. 
T1 STRUCTURE OF CaCO<sub>3</sub> NANOCRYSTALS ON THE HEAT EXCHANGER WALL AND IN A SUPERSATURATED AQUEOUS SOLUTION
JF Nanoscience and Technology: An International Journal
JO NST
YR 2016
FD 2017-03-18
VO 7
IS 3
SP 247
OP 259
K1 Gibbs energy
K1 solution concentration
K1 magnetic treatment of water
K1 antiscaling effect
K1 critical nucleus
K1 calcite and aragonite as polymorphic phases of CaCO<sub>3</sub>
AB An analysis of thermodynamics of CaCO<sub>3</sub> phase transition in a supersaturated aqueous solution showed that the formation of scale in the form of calcite on the channel wall in the absence of magnetic treatment of a water flow is related to a smaller Gibbs energy of the generation of the
crystalline phase mentioned. Moreover, such a character of CaCO<sub>3</sub> crystallization is caused by the fact that the magnitude of crystallographic mismatch between the crystallized salt (calcite or aragonite) and the surface (iron oxide and iron carbonate) is several times higher for aragonite. On considering the process of homogeneous generation in the aqueous bulk, it was found that
nanosized nuclei with a radius over 1 nm also had the calcite phase, and those with a radius less than 1 nm have the aragonite phase. This effect was caused by a higher density of the aragonite phase. The results of the analysis of the thermodynamics of CaCO<sub>3</sub> phase transition
allow one to explain manifestations of the magnetic treatment antiscale effect observed in real-life
heat-and-power installations.

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