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Updated: Dec 20, 2025

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Dynamical processes of interstitial diffusion in a two-dimensional colloidal crystal.

Sung-Cheol Kim¹, Lichao Yu¹, Alexandros Pertsinidis¹

¹Department of Physics, Brown University, Providence, RI 02912.

Proceedings of the National Academy of Sciences of the United States of America

|May 30, 2020

Summary

This summary is machine-generated.

Point defects, like interstitials, are key in 2D solids. This study reveals their dynamics in colloidal crystals, showing interstitials diffuse faster than vacancies and can induce local melting.

Keywords:

2D colloidal crystal detailed balance diffusion interstitial defects

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$Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography$

Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography

Published on: April 24, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Statistical Mechanics

Background:

Point defects (vacancies, interstitials) are topological defect bound states in 2D solids.
Their role in system thermodynamics is significant, yet their dynamics are poorly understood.
2D colloidal crystals offer a model system for real-time defect dynamics study.

Purpose of the Study:

Investigate the dynamical processes of interstitials in 2D colloidal crystals.
Quantify diffusion constants of mono- and diinterstitials.
Explore the symmetry and lattice distortion associated with interstitial defects.

Main Methods:

Utilized video microscopy to observe real-time dynamics of defects in 2D colloidal crystals.
Measured diffusion constants for mono- and diinterstitials.
Analyzed the positional patterns of disclinations relative to defect centers.

Main Results:

Diffusion constants of interstitials (mono- and di-) are significantly higher than vacancies.
Diinterstitials diffuse slower than monointerstitials.
Monointerstitials exhibit sixfold symmetry, indicating equilibrium and local detailed balance.
Diinterstitials do not show this symmetry within the observed window, suggesting severe, slow-recovering lattice distortions.

Conclusions:

Interstitials play a crucial role in the dynamics of 2D colloidal crystals.
The observed symmetry breaking by diinterstitials suggests a pathway to inducing local lattice melting.
This research provides a foundation for microscopic studies on melting dynamics in model systems.