Nucleation in systems with a metastable liquid–gas critical point is the prototypical example of a two-step nucleation process in which the appearance of the critical nucleus is preceded by the formation of a liquid-like density fluctuation. So far, the majority of studies on colloidal and protein crystallization have focused on one-component systems, and we are lacking a clear description of two-step nucleation processes in multicomponent systems, where critical fluctuations involve coupled density and concentration inhomogeneities. Here, we examine the nucleation process of a binary mixture of patchy particles designed to nucleate into a diamond lattice. By combining Gibbs-ensemble simulations and direct nucleation simulations over a wide range of thermodynamic conditions, we are able to pin down the role of the liquid–gas metastable phase diagram on the nucleation process. In particular, we show that the strongest enhancement of crystallization occurs at an azeotropic point with the same stoichiometric composition of the crystal.
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Two-step nucleation in a binary mixture of patchy particles
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21 April 2023
Research Article|
April 17 2023
Two-step nucleation in a binary mixture of patchy particles
Special Collection:
Nucleation: Current Understanding Approaching 150 Years After Gibbs
Camilla Beneduce
;
Camilla Beneduce
(Conceptualization, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing)
1
Dipartimento di Fisica, Sapienza Università di Roma
, Piazzale Aldo Moro 5, 00185 Rome, Italy
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Diogo E. P. Pinto
;
Diogo E. P. Pinto
(Conceptualization, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing)
1
Dipartimento di Fisica, Sapienza Università di Roma
, Piazzale Aldo Moro 5, 00185 Rome, Italy
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Petr Šulc
;
Petr Šulc
(Conceptualization, Investigation, Methodology, Writing – original draft, Writing – review & editing)
2
School of Molecular Sciences and Center for Molecular Design and Biomimetics, The Biodesign Institute, Arizona State University
, 1001 South McAllister Avenue, Tempe, Arizona 85281, USA
3
Life and Medical Sciences (LIMES), University of Bonn
, 53121 Bonn, Germany
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Francesco Sciortino
;
Francesco Sciortino
(Conceptualization, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing)
1
Dipartimento di Fisica, Sapienza Università di Roma
, Piazzale Aldo Moro 5, 00185 Rome, Italy
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John Russo
John Russo
a)
(Conceptualization, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing)
1
Dipartimento di Fisica, Sapienza Università di Roma
, Piazzale Aldo Moro 5, 00185 Rome, Italy
a)Author to whom correspondence should be addressed: john.russo@uniroma1.it
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a)Author to whom correspondence should be addressed: john.russo@uniroma1.it
Note: This paper is part of the JCP Special Topic on Nucleation: Current Understanding Approaching 150 Years After Gibbs.
J. Chem. Phys. 158, 154502 (2023)
Article history
Received:
December 31 2022
Accepted:
March 24 2023
Citation
Camilla Beneduce, Diogo E. P. Pinto, Petr Šulc, Francesco Sciortino, John Russo; Two-step nucleation in a binary mixture of patchy particles. J. Chem. Phys. 21 April 2023; 158 (15): 154502. https://doi.org/10.1063/5.0140847
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