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Does Local Structure Bias How a Crystal Nucleus Evolves?

preprint
submitted on 01.10.2018 and posted on 02.10.2018 by Kyle Hall, Zhengcai Zhang, Christian Burnham, Guang-Jun Guo, Sheelagh Carpendale, Niall J. English, Peter G. Kusalik

The broad scientific and technological importance of crystallization has led to significant research probing and rationalizing crystallization processes, particularly how nascent

crystal phases appear. Previous work has generally neglected the possibility of the molecular-level dynamics of individual nuclei coupling to local structures (e.g., that of the nucleus and its

surrounding environment). However, recent experimental work has conjectured that this can occur. Therefore, to address a deficiency in scientific understanding of crystallization, we have

probed the nucleation of prototypical single and multi-component crystals (specifically, ice and mixed gas hydrates). Here, we establish that local structures can bias the evolution of nascent

crystal phases on a nanosecond timescale by, for example, promoting the appearance or disappearance of specific crystal motifs, and thus reveal a new facet of crystallization behaviour.

Analysis of the crystallization literature confirms that structural biases are likely present during crystallization processes beyond ice and gas hydrate formation. Moreover, we demonstrate that

structurally-biased dynamics are a lens for understanding existing computational and experimental results while pointing to future opportunities.

History

Email Address of Submitting Author

hallkw@ucalgary.ca

Institution

Temple University

Country

USA

ORCID For Submitting Author

0000-0003-1611-7812

Declaration of Conflict of Interest

The authors declare no competing financial interests.

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