Assembly of vorticity-aligned hard-sphere colloidal strings in a simple shear flow

Handle URI:
http://hdl.handle.net/10754/597608
Title:
Assembly of vorticity-aligned hard-sphere colloidal strings in a simple shear flow
Authors:
Cheng, X.; Xu, X.; Rice, S. A.; Dinner, A. R.; Cohen, I.
Abstract:
Colloidal suspensions self-assemble into equilibrium structures ranging from face- and body-centered cubic crystals to binary ionic crystals, and even kagome lattices. When driven out of equilibrium by hydrodynamic interactions, even more diverse structures can be accessed. However, mechanisms underlying out-of-equilibrium assembly are much less understood, though such processes are clearly relevant in many natural and industrial systems. Even in the simple case of hard-sphere colloidal particles under shear, there are conflicting predictions about whether particles link up into string-like structures along the shear flow direction. Here, using confocal microscopy, we measure the shear-induced suspension structure. Surprisingly, rather than flow-aligned strings, we observe log-rolling strings of particles normal to the plane of shear. By employing Stokesian dynamics simulations, we address the mechanism leading to this out-of-equilibrium structure and show that it emerges from a delicate balance between hydrodynamic and interparticle interactions. These results demonstrate a method for assembling large-scale particle structures using shear flows.
Citation:
Cheng X, Xu X, Rice SA, Dinner AR, Cohen I (2011) Assembly of vorticity-aligned hard-sphere colloidal strings in a simple shear flow. Proceedings of the National Academy of Sciences 109: 63–67. Available: http://dx.doi.org/10.1073/pnas.1118197108.
Publisher:
Proceedings of the National Academy of Sciences
Journal:
Proceedings of the National Academy of Sciences
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
23-Dec-2011
DOI:
10.1073/pnas.1118197108
PubMed ID:
22198839
PubMed Central ID:
PMC3252901
Type:
Article
ISSN:
0027-8424; 1091-6490
Sponsors:
X.C. and I. C. would like to acknowledge T. Beatus, J. Brady, Y.-C. Lin, J. McCoy, D. Pine, and L. Ristroph for help with experiments and useful discussions. X. X., S. A. R., and A. R. D would like to thank J. Brady, J. Morris, and J. Swan for help with the Stokesian dynamics simulations and useful discussions. The research by X. C. and I. C. was supported by grants from the Department of Energy, Basic Energy Sciences. This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). X. X., S. A. R., and A. R. D. acknowledge financial and central facilities assistance of the University of Chicago MRSEC, supported by the National Science Foundation (NSF DMR-MRSEC 0820054).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorCheng, X.en
dc.contributor.authorXu, X.en
dc.contributor.authorRice, S. A.en
dc.contributor.authorDinner, A. R.en
dc.contributor.authorCohen, I.en
dc.date.accessioned2016-02-25T12:42:58Zen
dc.date.available2016-02-25T12:42:58Zen
dc.date.issued2011-12-23en
dc.identifier.citationCheng X, Xu X, Rice SA, Dinner AR, Cohen I (2011) Assembly of vorticity-aligned hard-sphere colloidal strings in a simple shear flow. Proceedings of the National Academy of Sciences 109: 63–67. Available: http://dx.doi.org/10.1073/pnas.1118197108.en
dc.identifier.issn0027-8424en
dc.identifier.issn1091-6490en
dc.identifier.pmid22198839en
dc.identifier.doi10.1073/pnas.1118197108en
dc.identifier.urihttp://hdl.handle.net/10754/597608en
dc.description.abstractColloidal suspensions self-assemble into equilibrium structures ranging from face- and body-centered cubic crystals to binary ionic crystals, and even kagome lattices. When driven out of equilibrium by hydrodynamic interactions, even more diverse structures can be accessed. However, mechanisms underlying out-of-equilibrium assembly are much less understood, though such processes are clearly relevant in many natural and industrial systems. Even in the simple case of hard-sphere colloidal particles under shear, there are conflicting predictions about whether particles link up into string-like structures along the shear flow direction. Here, using confocal microscopy, we measure the shear-induced suspension structure. Surprisingly, rather than flow-aligned strings, we observe log-rolling strings of particles normal to the plane of shear. By employing Stokesian dynamics simulations, we address the mechanism leading to this out-of-equilibrium structure and show that it emerges from a delicate balance between hydrodynamic and interparticle interactions. These results demonstrate a method for assembling large-scale particle structures using shear flows.en
dc.description.sponsorshipX.C. and I. C. would like to acknowledge T. Beatus, J. Brady, Y.-C. Lin, J. McCoy, D. Pine, and L. Ristroph for help with experiments and useful discussions. X. X., S. A. R., and A. R. D would like to thank J. Brady, J. Morris, and J. Swan for help with the Stokesian dynamics simulations and useful discussions. The research by X. C. and I. C. was supported by grants from the Department of Energy, Basic Energy Sciences. This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). X. X., S. A. R., and A. R. D. acknowledge financial and central facilities assistance of the University of Chicago MRSEC, supported by the National Science Foundation (NSF DMR-MRSEC 0820054).en
dc.publisherProceedings of the National Academy of Sciencesen
dc.subjectColloidsen
dc.subjectShear-induced structureen
dc.titleAssembly of vorticity-aligned hard-sphere colloidal strings in a simple shear flowen
dc.typeArticleen
dc.identifier.journalProceedings of the National Academy of Sciencesen
dc.identifier.pmcidPMC3252901en
dc.contributor.institutionCornell University, Ithaca, United Statesen
dc.contributor.institutionUniversity of Chicago, Chicago, United Statesen
kaust.grant.numberKUS-C1-018-02en

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