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Related Experiment Video

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Glassy dislocation dynamics in 2D colloidal dimer crystals.

Sharon J Gerbode¹, Umang Agarwal, Desmond C Ong

¹Department of Physics, Cornell University, Ithaca, New York 14853, USA.

Physical Review Letters

|September 28, 2010

Summary

This summary is machine-generated.

Researchers discovered a new type of glassy dynamics in 2D colloidal dimer crystals. Dislocations within these crystals exhibit two-stage relaxation, revealing novel glassy behavior in ordered systems.

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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Published on: January 26, 2016

Area of Science:

Condensed Matter Physics
Materials Science
Soft Matter Physics

Background:

Glassy relaxation is typically linked to disordered systems.
Dislocation motion in 2D dimer crystals is known to be influenced by particle orientation.

Purpose of the Study:

To investigate a novel type of glassy dynamics.
To explore dislocation motion and relaxation in 2D colloidal dimer crystals.

Main Methods:

Experimentally dragging an optically trapped particle through 2D dimer crystals to create dislocations.
Conducting simulations of sheared dimer crystals.

Main Results:

Observed a two-stage relaxation process for dislocations: initial gliding followed by logarithmic slow relaxation.
Dislocations become caged by particles, leading to hopping between configurations.
Simulations showed a caging plateau in dislocation mean squared displacement, characteristic of glassy dynamics.

Conclusions:

Identified a new glassy system within an ordered colloidal crystal.
Demonstrated that dislocations in 2D dimer crystals exhibit glassy dynamics.
Dislocation dynamics are governed by particle orientation and caging effects.