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Solubility and Nucleation of Methyl Stearate as a Function of Crystallization Environment
journal contribution
posted on 2018-02-20, 00:00 authored by Diana M. Camacho, Kevin J. Roberts, Iain More, Ken LewtasCrystallization
studies of methyl stearate from supersaturated
dodecane, kerosene, and toluene solutions reveal strong evidence that
solvent choice influences solubility and nucleation behavior. Solute
solubility is less than ideal with toluene, kerosene, and dodecane,
respectively, exhibiting the closest behavior to ideality, the latter
consistent with the highest solvation. Polythermal crystallization
studies using the Kashchiev–Borissova–Hammond–Roberts
(KBHR) model [Kashchiev et al. J. Phys. Chem. B 2010, 114, 5441; Kashchiev et al. J. Cryst. Growth 2010, 312, 698; Camacho et al. CrystEngComm 2014, 16, 974] reveal a progressive nucleation (PN) mechanism with crystallite
interfacial tension (γeff) values between 0.94 and
1.55 mJ/m2, between 1.21 and 1.91 mJ/m2, and
between 1.18 and 1.88 mJ/m2 for dodecane, kerosene, and
toluene, respectively. Nucleation rates at the critical undercooling
lie between 4.56 × 1016 and 1.79 × 1017 nuclei/mL·s, with the highest rates associated with crystallization
from kerosene solutions. Iso-supersaturation nucleation rates are
the highest for dodecane ranging from 2.39 × 1017 to
3.63 × 1018 nuclei/mL·s. Nucleation in toluene
appears to be hindered by its relatively higher interfacial tension,
which is associated with nucleation rates about an order of magnitude
less than those obtained for dodecane.
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Keywords
Iso-supersaturation nucleation ratesSolute solubilityKBHRnucleichoice influences solubilitykerosene solutionsPNMethyl StearateKashchievsupersaturated dodecanenucleation behaviormJmethyl stearatenucleation ratesPolythermal crystallization studiestoluene solutionstensionNucleation ratesCrystallization Environment Crystallization studies
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