Strain heterogeneity in sheared colloids revealed by neutron scattering

Kevin Chen, Bin Wu, Lilin He, Gregory S. Smith, Changwoo Do, Guan Rong Huang, Gaibo Zhang, Yangyang Wang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Recent computational and theoretical studies have shown that the deformation of colloidal suspensions under a steady shear is highly heterogeneous at the particle level and demonstrate a critical influence on the macroscopic deformation behavior. Despite its relevance to a wide variety of industrial applications of colloidal suspensions, scattering studies focusing on addressing the heterogeneity of the non-equilibrium colloidal structure are scarce thus far. Here, we report the first experimental result using small-angle neutron scattering. From the evolution of strain heterogeneity, we conclude that the shear-induced deformation transforms from nearly affine behavior at low shear rates, to plastic rearrangements when the shear rate is high.

Original languageEnglish
Pages (from-to)6050-6054
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number9
DOIs
StatePublished - 2018

Funding

This research at CNMS and SNS of Oak Ridge National Laboratory was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. K. C. acknowledges the support of ORNL High School Research Experience program. G. Z. thanks the support of ORNL Higher Education Research Experiences program. This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division. G.-R. H. acknowledges the supports from the National Center for Theoretical Sciences, Ministry of Science and Technology in Taiwan (Project No. MOST 106-2119-M-007-019) and the Shull Wollan Center during his visit to ORNL. We thank Peter Schall and Alessio Zaccone for helpful discussions.

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