In situ optical spectroscopy of crystallization: One crystal nucleation at a time.

Autor:	Urquidi O; Department of Physical Chemistry, Sciences II, University of Geneva, 1211 Geneva, Switzerland., Brazard J; Department of Physical Chemistry, Sciences II, University of Geneva, 1211 Geneva, Switzerland., LeMessurier N; Department of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada., Simine L; Department of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada., Adachi TBM; Department of Physical Chemistry, Sciences II, University of Geneva, 1211 Geneva, Switzerland.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2022 Apr 19; Vol. 119 (16), pp. e2122990119. Date of Electronic Publication: 2022 Apr 08.
DOI:	10.1073/pnas.2122990119
Abstrakt:	While crystallization is a ubiquitous and an important process, the microscopic picture of crystal nucleation is yet to be established. Recent studies suggest that the nucleation process can be more complex than the view offered by the classical nucleation theory. Here, we implement single crystal nucleation spectroscopy (SCNS) by combining Raman microspectroscopy and optical trapping induced crystallization to spectroscopically investigate one crystal nucleation at a time. Raman spectral evolution during a single glycine crystal nucleation from water, measured by SCNS and analyzed by a nonsupervised spectral decomposition technique, uncovered the Raman spectrum of prenucleation aggregates and their critical role as an intermediate species in the dynamics. The agreement between the spectral feature of prenucleation aggregates and our simulation suggests that their structural order emerges through the dynamic formation of linear hydrogen-bonded networks. The present work provides a strong impetus for accelerating the investigation of crystal nucleation by optical spectroscopy.
Databáze:	MEDLINE
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