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Short-Time Glassy Dynamics in Viscous Protein Solutions with Competing Interactions
P Douglas Godfrin1, Steven D Hudson2, Kunlun Hong3
1Center for Neutron Science, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA.
Physical Review Letters
|December 10, 2015
Summary
Colloidal dispersions with competing interactions exhibit unique glass transition dynamics. Understanding intermediate-range order is crucial for predicting macroscopic properties in these complex systems.
Area of Science:
- Colloid science
- Soft matter physics
- Biophysics
Background:
- Colloidal dispersions are complex fluids with unique phase behaviors.
- Understanding glass transitions in these systems is vital for materials science.
- Lysozyme solutions offer a model system for studying protein interactions.
Purpose of the Study:
- To investigate the glass transition in colloidal dispersions with competing interactions.
- To explore the role of short-ranged attraction and long-ranged repulsion.
- To elucidate the relationship between microstructure and macroscopic properties.
Main Methods:
- Utilizing highly purified lysozyme solutions as a model system.
- Performing rheological measurements to assess liquid behavior.
- Analyzing short-time dynamics to identify glassy features.
Main Results:
- Newtonian liquid behavior was observed across all conditions.
- High protein concentrations revealed glassy colloidal system dynamics.
- A heterogeneous microstructure at intermediate length scales was identified.
Conclusions:
- The competition between attractive and repulsive forces drives unique behaviors.
- Intermediate-range order significantly influences macroscopic properties.
- Existing theories require incorporating intermediate-range order for accuracy.
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