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Size-dependent thermodynamic structural selection in colloidal crystallization.

Evan Pretti¹, Hasan Zerze¹, Minseok Song¹

¹Department of Chemical and Biomolecular Engineering, Lehigh University, B323 Iacocca Hall, 111 Research Drive, Bethlehem, PA 18015-4791, USA.

Science Advances

|September 25, 2019

Summary

This summary is machine-generated.

Colloidal crystallization in binary mixtures can transform structures thermodynamically, not just kinetically. This finding is crucial for controlling crystal formation in particle assembly.

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Area of Science:

Colloid science
Materials science
Physical chemistry

Background:

Crystalline phase nucleation and growth are fundamental to physical processes like freezing and colloidal particle assembly.
Observed crystallite structures often deviate from thermodynamic predictions due to kinetic effects.
Understanding colloidal crystallization is key for predicting and controlling resultant structures.

Purpose of the Study:

To investigate the self-assembly of binary colloid mixtures in two dimensions.
To elucidate the driving forces behind structural transformations during colloidal crystal growth.
To differentiate between thermodynamic and kinetic control in structural selection.

Main Methods:

Studied the self-assembly of a two-dimensional binary colloid mixture.
Analyzed the structural transformation from non-close-packed to close-packed lattices.
Investigated the role of size-dependent free energy in relative stability of structures.

Main Results:

Observed a structural transformation from non-close-packed to close-packed lattices during crystal growth.
Demonstrated that this transformation is thermodynamically driven.
Showed that size-dependent free energy dictates the relative stability of the two structures.

Conclusions:

Structural selection in this binary colloidal system is governed by thermodynamics, specifically size-dependent free energy.
This contrasts with previous attributions to growth kinetics or fluid interactions.
Findings highlight the importance of thermodynamic control in colloidal self-assembly.