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Title: Non-classical crystallization in soft and organic materials

Journal Article · · Nature Reviews. Materials

Classical nucleation and crystal growth theories describe how nuclei form, become stable after reaching a critical size, and then enlarge through monomer attachment. Since more than two decades ago, non-classical pathways have been proposed for various types of (bio)molecules and materials, which can substantially alter the crystallization kinetics and outcomes. Direct observation of non-classical crystallization of inorganic nanomaterials, including metastable structure-mediated and particle attachment-based pathways that usually occur on the nanoscale, was enabled by liquid-phase in situ electron microscopy. However, it was not until recently that the crystallization dynamics of beam-sensitive soft materials were directly imaged with sufficient spatial resolution, and a level of microstructural understanding of defects and interfaces emerged. This article provides a high-level review of the non-classical crystallization pathways discovered in soft and organic materials and a forward-looking guide for future research. We first analyze how the characteristics of soft materials affect their crystallization pathways and kinetics. We then identify technical approaches to studying the crystallization trajectories of soft materials and discuss strategies to properly select and apply them to different systems. Breakthroughs made in understanding the crystallization of small organic molecules, (bio)macromolecules, colloids, and reticular framework materials are examined. Finally, we provide an outlook on the challenges in elucidating soft material crystallization pathways and the opportunities for assisting the design and synthesis of new materials and structures.

Research Organization:
Univ. of Washington, Seattle, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE
Grant/Contract Number:
SC0019288; AC05-76RL01830
OSTI ID:
2290447
Alternate ID(s):
OSTI ID: 2405096
Report Number(s):
PNNL-SA-189362
Journal Information:
Nature Reviews. Materials, Vol. 9; ISSN 2058-8437
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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