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Dynamics and yielding of binary self-suspended nanoparticle fluids
Akanksha Agrawal1, Hsiu-Yu Yu, Samanvaya Srivastava
1School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY 14853, USA. laa25@cornell.edu.
Soft Matter
|June 9, 2015
Summary
Adding larger particles to nanoparticle suspensions fluidizes them, speeding up particle motion and reducing energy loss during yielding. This study explores ligand-mediated jamming and un-jamming in hairy particle systems.
Area of Science:
- Colloid and Surface Science
- Materials Science
- Rheology
Background:
- Bi-disperse particle suspensions exhibit complex yielding and flow behaviors.
- Understanding these transitions is crucial for designing advanced materials.
Purpose of the Study:
- To investigate yielding and flow transitions in solvent-free, self-suspended nanoparticle systems.
- To elucidate the role of particle size disparity on suspension properties.
Main Methods:
- Utilized a model system of self-suspended spherical nanoparticles.
- Studied suspensions with varying size ratios of smaller and larger particles.
Main Results:
- Addition of larger particles softens suspensions, leading to complete fluidization with large size disparities.
- Observed accelerated de-correlation dynamics for all particles.
- Found a reduction in energy dissipated at the yielding transition.
Conclusions:
- Particle size disparity significantly impacts suspension rheology.
- Findings suggest ligand-mediated jamming and un-jamming mechanisms govern these behaviors in hairy particle suspensions.
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