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Title: Spatiotemporal periodicity of dislocation dynamics in a two-dimensional microfluidic crystal flowing in a tapered channel

When a many-body system is driven away from equilibrium, order can spontaneously emerge in places where disorder might be expected. Here we report an unexpected order in the flow of a concentrated emulsion in a tapered microfluidic channel. The velocity profiles of individual drops in the emulsion show periodic patterns in both space and time. Such periodic patterns appear surprising from both a fluid and a solid mechanics point of view. In particular, when the emulsion is considered as a soft crystal under extrusion, a disordered scenario might be expected based on the stochastic nature of dislocation dynamics in microscopic crystals. However, an orchestrated sequence of dislocation nucleation and migration is observed to give rise to a highly ordered deformation mode. This discovery suggests that nanocrystals can be made to deform more controllably than previously thought. It can also lead to novel flow control and mixing strategies in droplet microfluidics.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Stanford Univ., CA (United States)
Publication Date:
Grant/Contract Number:
SC0010412
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 113; Journal Issue: 43; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Stanford Univ., CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 77 NANOSCIENCE AND NANOTECHNOLOGY
OSTI Identifier:
1328597
Alternate Identifier(s):
OSTI ID: 1426212

Gai, Ya, Min Leong, Chia, Cai, Wei, and Tang, Sindy K. Y.. Spatiotemporal periodicity of dislocation dynamics in a two-dimensional microfluidic crystal flowing in a tapered channel. United States: N. p., Web. doi:10.1073/pnas.1606601113.
Gai, Ya, Min Leong, Chia, Cai, Wei, & Tang, Sindy K. Y.. Spatiotemporal periodicity of dislocation dynamics in a two-dimensional microfluidic crystal flowing in a tapered channel. United States. doi:10.1073/pnas.1606601113.
Gai, Ya, Min Leong, Chia, Cai, Wei, and Tang, Sindy K. Y.. 2016. "Spatiotemporal periodicity of dislocation dynamics in a two-dimensional microfluidic crystal flowing in a tapered channel". United States. doi:10.1073/pnas.1606601113.
@article{osti_1328597,
title = {Spatiotemporal periodicity of dislocation dynamics in a two-dimensional microfluidic crystal flowing in a tapered channel},
author = {Gai, Ya and Min Leong, Chia and Cai, Wei and Tang, Sindy K. Y.},
abstractNote = {When a many-body system is driven away from equilibrium, order can spontaneously emerge in places where disorder might be expected. Here we report an unexpected order in the flow of a concentrated emulsion in a tapered microfluidic channel. The velocity profiles of individual drops in the emulsion show periodic patterns in both space and time. Such periodic patterns appear surprising from both a fluid and a solid mechanics point of view. In particular, when the emulsion is considered as a soft crystal under extrusion, a disordered scenario might be expected based on the stochastic nature of dislocation dynamics in microscopic crystals. However, an orchestrated sequence of dislocation nucleation and migration is observed to give rise to a highly ordered deformation mode. This discovery suggests that nanocrystals can be made to deform more controllably than previously thought. It can also lead to novel flow control and mixing strategies in droplet microfluidics.},
doi = {10.1073/pnas.1606601113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 43,
volume = 113,
place = {United States},
year = {2016},
month = {10}
}

Works referenced in this record:

Soft Lithography
journal, August 1998