Abstract
Induction time and metastable-zone-width (MSZW) data for aqueous l-glycine solutions in the presence of l-arginine impurity were experimentally measured using a turbidity probe in this study. The nucleation parameters, including the interfacial free energy and pre-exponential nucleation factor, obtained from induction time data, were compared with those obtained from MSZW data. The influences of lag time on the nucleation parameters were examined for the induction time data. The effects of l-arginine impurity concentration on the nucleation parameters based on both the induction time and MSZW data were investigated in detail.
Highlights
In crystal growth, the induction time is defined as the time interval between the establishment of the supersaturated state and the formation of detectable nuclei
The lag time corresponds the time induction required fortimes the heated solutionintoTable be lowered to averag times for the as induction time data are in Table
A model was proposed based on classical nucleation theory (CNT) to determine the nucleation parameters from both the induction and MSZW data
Summary
The induction time is defined as the time interval between the establishment of the supersaturated state and the formation of detectable nuclei. The metastable-zone-width (MSZW) limit is defined as the time taken at a given cooling rate between the establishment of the supersaturated state and the formation of detectable nuclei. Nucleation is the initial process for the formation of crystals in liquid solutions Both the induction time and MSZW data are related to the nucleation rate of the crystallized substance in solutions. The interfacial free energy is the energy required to create a new solid/liquid interface for the formation of crystals in liquid solutions, while the pre-exponential factor is related to the attachment rate of solute molecules to a cluster in the formation of crystals. The influences of impurities on the nucleation parameters have long been investigated using induction time or MSZW data with the addition of different impurities in solutions for a variety of compounds [4,5,6,7,8,9,10,11,12,13,14]
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