Recent developments in understanding of the metastable zone width of different solute−solvent systems

Nucleation mechanism and kinetics from the analysis of polythermal crystallisation data: methyl stearate from kerosene solutions

“…More recently, the approach [1,2] has led to alternative expressions that overcome some of the drawbacks of the previous approaches [5,6,[8][9][10] . These expressions do not contain empirical parameters and allow -rulled crystallisation to be distinguished from that mediated by , because while, in the former case the critical undercooling depends on both the nucleation and the growth rate of the crystallites, in the latter case, it is only controlled by the growth rate of the instantaneously nucleated crystallites provided their concentration is independently known.…”

“…The parameters in the model expression (10) , and all have a distinct physical meaning because relates to the crystallites growth as its value is determined by the growth exponents , and , is a fraction of or equal to the thermodynamic nucleation parameter , and is expressed by parameters of both the nucleation and the growth of the crystallites.…”

“…He proposed a theoretical model, predicting also linearity between and , which starts from the assumption that the measured corresponds to the undercooling at which the number density of accumulated grown primary nuclei has reached a fixed (but unknown) value. Recently, employing the classical nucleation theory, Sangwal [5,9,10] obtained a ( ) formula which provides physical insight into the parameters associated with it and which reveals linearity between ( ) and ln . More recently Kashchiev, Borissova, Hammond and Roberts ( ) developed an analytical approach [1,2] , based on that of Kolmogorov-Johnson-Mehl-Avrami ( ), which led to ( ) expressions derived from the initial temporal evolution of either the fraction ( ) of crystallised volume or the number ( ) of nucleated crystallites.…”

Solubility and Seeded Metastable Zone width of functional sugar L-arabinose

“…Deviation = 27.11± 2.34), which might be explained by the following reasons. Firstly, MSZW is a function of the induction time of nucleation (t ind ) and cooling rate (Zhang et al, 2012;Herden et al, 2001;Kobari et al, 2010;Kim & Mersmann, 2001;Sangwal, 2011). It has been pointed out that log (ΔT m ) increased linearly with an increase in log R (cooling rate).…”

Influence of Cationic Surfactants on the Crystallization of Cis‐ and Trans‐Isomers

“…The glass tube was located at an identical site of the jacket crystallizer for each run. Actually, it was impossible to directly observe the critical nuclei as they formed in solution (Sangwal, ) and the critical nuclei were only observed after they had grown to a critical size. Usually, MZW refers to the temperature that elapsed after the creation of supersaturation in solution until the appearance of a certain detectable size of particles.…”