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Kinetic glass transition in a micellar system with short-range attractive interaction
Mallamace1, Gambadauro, Micali
1Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 and Istituto Nazionale per la Fisica della Materia, Genova, Italy.
Physical Review Letters
|September 16, 2000
Summary
Percolation and structural arrest transitions coexist in copolymer-micellar systems due to intermicellar attraction. This leads to a nonergodic transition with unique time-dependent behaviors, explained by mode-coupling theory.
Area of Science:
- Soft matter physics
- Polymer science
- Physical chemistry
Background:
- Copolymer-micellar systems exhibit complex phase behaviors.
- Understanding transitions like percolation and structural arrest is crucial.
- Interactions between micelles influence system dynamics.
Purpose of the Study:
- To investigate the coexistence of percolation and structural arrest transitions.
- To correlate these transitions with intermicellar attraction.
- To analyze the dynamics of the copolymer-micellar system.
Main Methods:
- Phase diagram analysis of copolymer-micellar systems.
- Measurement of the intermediate scattering function.
- Time-dependent analysis of system dynamics.
Main Results:
- Percolation and structural arrest transitions were found to coexist in distinct phase regions.
- A nonergodic transition was observed, dependent on temperature and concentration.
- Logarithmic time dependence followed by power-law behavior was identified.
Conclusions:
- Short-range intermicellar attraction drives the observed transitions.
- The dynamics are consistent with a higher-order glass transition singularity predicted by mode-coupling theory.
- The study provides insights into the complex dynamics of soft matter systems.