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Related Experiment Video

Updated: Jun 22, 2026

Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments

Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments

Published on: February 4, 2021

Experimental evidence for two-step nucleation in colloidal crystallization.

J R Savage¹, A D Dinsmore

¹Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.

Physical Review Letters

|June 13, 2009

Summary

This summary is machine-generated.

Researchers studied colloidal sphere freezing in 2D. They observed both single-step and two-step nucleation processes, with the latter involving amorphous cluster growth before rapid crystallization, influenced by gas-liquid coexistence.

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Area of Science:

Soft matter physics
Colloidal science
Phase transitions

Background:

Understanding crystallization mechanisms is crucial for materials science.
Two-dimensional systems offer unique insights into nucleation phenomena.
Colloidal systems provide a tunable platform for studying fundamental physics.

Purpose of the Study:

To investigate the freezing dynamics of colloidal spheres in two dimensions.
To resolve crystallization processes at the single-particle level.
To explore the role of metastable states in nucleation.

Main Methods:

Utilized micron-size, charge-stabilized polystyrene spheres.
Induced temperature-dependent depletion attraction using surfactant micelles.
Monitored particle motion with single-particle resolution during supercooling and crystallization.

Main Results:

Observed single-step nucleation consistent with classical nucleation theory at low concentrations.
Identified two-step nucleation where amorphous clusters grew before rapid crystallization.
Measured free energies revealed the influence of metastable gas-liquid coexistence on nucleation rates.

Conclusions:

Two-step nucleation is a significant pathway in 2D colloidal freezing.
Metastable gas-liquid coexistence can enhance nucleation rates, especially after deep quenches.
Single-particle resolution provides critical data for validating nucleation theories.