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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
Published on: January 26, 2016
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Anomalous dynamics at the hard-sphere glass transition
Paweł Kwaśniewski1, Andrei Fluerasu, Anders Madsen
1European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble, France.
Soft Matter
|September 27, 2014
Summary
Dynamics in concentrated hard sphere suspensions reveal anomalous relaxation modes near the glass transition. These findings suggest non-thermal stress drives the observed ergodicity restoration, aligning with mode coupling theory predictions.
Area of Science:
- Soft matter physics
- Materials science
- Condensed matter dynamics
Background:
- Hard sphere suspensions are model systems for studying phase transitions and glassy dynamics.
- Understanding dynamics near the glass transition is crucial for predicting material properties.
Purpose of the Study:
- To investigate the dynamic behavior of hard sphere suspensions at high concentrations, near the glass transition.
- To identify and characterize anomalous relaxation modes in these systems.
Main Methods:
- Utilizing X-ray photon correlation spectroscopy (XPCS) to probe dynamics.
- Analyzing relaxation modes and ergodicity in concentrated suspensions.
Main Results:
- Observed emergence of ergodicity restoring anomalous intermittent relaxation modes.
- These phenomena were detected in the highest concentration suspension, estimated above the glass transition concentration.
- Results were compared with predictions from mode coupling theory.
Conclusions:
- The observed anomalous dynamics are associated with non-thermal stress-induced relaxations.
- The findings provide insights into the complex dynamics occurring in dense colloidal systems.
- The study validates the interpretation through comparison with established theoretical frameworks like mode coupling theory.
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