Jennifer A. Digits's research while affiliated with Wake Forest University and other places
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Publications (3)
Symmetry breaking processes in both equilibrium and nonequilibrium systems are associated with critical parameters. In the general theory of symmetry breaking transitions, critical parameters have an important role. In this article, we present our study of rpm as a critical parameter in chiral symmetry breaking crystallization. The random distribut...
Chiral symmetry breaking can be realized in stirred crystallization of Na-ClO3. We present experimental and theoretical studies of the random distribution of crystal enantiomeric excess (cee) for various stirring and solvent evaporation rates. For a fixed solvent evaporation rate, as the stirring RPM is increased, the probability distribution of ce...
Results of our study of the kinetics of stirred crystallization that produces large (greater than 99%) asymmetry are presented. The change of concentration with time as the crystallization progresses is obtained for stirred and unstirred crystallizations. A sharp difference in the two concentration vs time curves, due to secondary nucleation in the...
Citations
... 15 Kondepudi et al. reported that the stirring speed was a critical parameter for determining the level of CSB in crystallization, as the secondary nucleation depended on stirring speed. 6 Similarly, Ahn et al. reported that the initial CSB (CSB at induction period) was enhanced with an increase in the agitation speed. 16 In this study, the initial CSB was correlated in terms of the initial supersaturation (supersaturation at the induction period). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/649818762407938-1531940274831_Q64/Dilip-Kondepudi.jpg)
... 11 Therefore, the secondary nucleation mechanism was usually combined with "mother crystal" to explain the complete CSB crystallization in Kondepudi's experiments. 4,8 That is, one crystal was first generated by the primary nucleation in crystallization and rapidly grew to be the mother crystal for secondary nucleation before the formation of the other form. 12 The stirring operation could trigger the secondary nucleation of the initial "mother crystal" and produce many daughter crystals of the same chirality. ...
... Viedma in 2005 proposed a mechanism for such spontaneous symmetry breaking during the stirred crystallization. 17 It occurs as a result of the stirrer breaking the cluster with a critical nucleus size into smaller fragments of the same chirality (secondary nucleation), 18 and the subsequent Frank autocatalytic process, 19 in combination with Ostwald ripening. 20 Viedma has shown that the preparation of pure enantiomorphous crystals is possible at a high primary nucleation rate, both due to the ''mill effect'', 17 created by glass balls, and due to the temperature gradient, in the absence of stirring. ...
