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Understanding the driving forces for crystal growth by oriented attachment through theory and simulations

M. Sushko

Published 2019 in Journal of Materials Research

ABSTRACT

Oriented attachment (OA) is a particle-based crystallization pathway in which nanocrystals self-assemble in solution and attach along certain crystallographic direction often forming highly organized three-dimensional crystal morphologies. The pathway offers the potential for a general synthetic approach of hierarchical nanomaterials, in which multiscale structural control is achieved by manipulating the interfacial nucleation and self-assembly of nanoscale building blocks. Here, the current status of the development of a predictive theoretical framework for modeling crystallization by OA is reviewed. A particular emphasis is made on recent developments in understanding the microscopic details of solvent-mediated forces that drive nanocrystal reorientation and alignment for face-selective attachment. Interactions arising from the correlated solvent dynamics at particle interfaces emerge as the main sources of long-range face-specific interparticle forces and short-range torque for fine particle alignment into lattice matching configuration. These findings shift the focus of the experimental and theoretical research of OA onto the detailed study of interfacial solvent structure and dynamics.

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