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Membrane undulations in a structured fluid: Universal dynamics at intermediate length and time scales
1The Stella and Avram Goren-Goldstein Department of Biotechnology Engineering, Ben-Gurion University of The Negev, 84105, Beer Sheva, Israel.
The European Physical Journal. E, Soft Matter
|January 5, 2018
Summary
Membrane undulations in structured fluids exhibit unique power-law dynamics. Researchers studied the crossover to bulk behavior, revealing a wide regime with distinct universal power laws for weakly coupled membranes.
Area of Science:
- Soft matter physics
- Fluid dynamics
- Biophysics
Background:
- Membrane undulations in viscous solvents follow anomalous power laws.
- In viscoelastic media, these dynamics are influenced by the bulk viscoelastic spectrum.
- Structured fluids require a characteristic correlation length to reach the continuum limit.
Purpose of the Study:
- Investigate the crossover dynamics of membrane undulations in structured fluids.
- Analyze how the continuum limit affects universal behaviors.
- Characterize the transition from structured fluid to bulk dynamics.
Main Methods:
- Utilized a generalized theory of hydrodynamic interactions in structured fluids.
- Analyzed the slow spatial decay of interactions towards the bulk limit.
- Focused on membranes weakly coupled to the structured medium.
Main Results:
- Identified a wide crossover regime governing membrane dynamics.
- Observed distinct, universal dynamic power laws within this regime.
- Demonstrated a slow spatial decay of hydrodynamic interactions.
Conclusions:
- The crossover to asymptotic bulk dynamics in structured fluids is characterized by novel power laws.
- These findings are relevant for various soft matter and biological systems.
- The study delineates the observable time regimes for these dynamic behaviors.
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