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Antisolvent sonocrystallisation of sodium chloride and the evaluation of ultrasound energy using modified classical nucleation theory

Lee, J. and Yang, S. (2018) Antisolvent sonocrystallisation of sodium chloride and the evaluation of ultrasound energy using modified classical nucleation theory Crystals, 8 (8), 320.

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Abstract

The crystal nucleation rate of sodium chloride in ethanol was investigated by measuring the induction time at various supersaturation ratios under silent and ultrasound irradiation at frequencies between 22-500 kHz. Under silent conditions, the data follows the classical nucleation theory showing both the homogeneous and heterogeneous regions, giving an interfacial surface tension of 31.0 mJ/m2. Sonication led to a non-linearity in the data and was fitted by a modified classical nucleation theory to account for the additional free energy being supplemented by sonication. For 98 kHz, this free energy increased from 1.33 x 108 to 1.90 x 108 J/m3 for sonication powers of 2 to 15 W, respectively. It is speculated that the energy is being supplemented by the localized bubble collapse and collisions. Increasing frequency from 22 to 500 kHz revealed a minimum induction time obtained at frequencies between 44 and 98 kHz, which has been attributed to the overall collapse intensity being the strongest at these frequencies.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Lee, J.j.y.lee@surrey.ac.uk
Yang, S.
Date : 10 August 2018
DOI : 10.3390/cryst8080320
Copyright Disclaimer : © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : Sonocrystallisation; Antisolvent; Induction time; Classical nucleation theory; Ultrasound
Depositing User : Clive Harris
Date Deposited : 12 Aug 2018 23:02
Last Modified : 19 Jun 2019 15:27
URI: http://epubs.surrey.ac.uk/id/eprint/848897

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