Self-assembly of chiral menthol molecules from a liquid film into ring-banded spherulites

T Kovács, R Szűcs, G Holló, Z Zuba… - Crystal Growth & …, 2019 - ACS Publications
Crystal Growth & Design, 2019ACS Publications
We investigate the growth of spherulites in the wake of a solidification front in a thin film of
liquid menthol. We observed that the two enantiomeric forms of menthol ((−)-menthol and (+)-
menthol)) form ring-banded spherulites, in which needle-like crystals self-assemble into high-
and low-density crystal regions. Interestingly, the racemic mixture produces nonbanded
spherulites consisting of closely packed plate-like crystals. In the ring-banded spherulitic
growth, we could clearly identify the curvature effect of the solidification front on the pattern …
We investigate the growth of spherulites in the wake of a solidification front in a thin film of liquid menthol. We observed that the two enantiomeric forms of menthol ((−)-menthol and (+)-menthol)) form ring-banded spherulites, in which needle-like crystals self-assemble into high- and low-density crystal regions. Interestingly, the racemic mixture produces nonbanded spherulites consisting of closely packed plate-like crystals. In the ring-banded spherulitic growth, we could clearly identify the curvature effect of the solidification front on the pattern formation on a millimeter spatial scale. We developed a numerical model based on the Cahn–Hilliard equation, which qualitatively describes the main features observed in experiments, namely, the formation of periodic ring-banded structures and the curvature effect of the propagating solidification front.
ACS Publications
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