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Title: Local elasticity in nonlinear rheology of interacting colloidal glasses revealed by neutron scattering and rheometry

Abstract

The flow of colloidal suspensions is ubiquitous in nature and industry. Colloidal suspensions showcase a wide range of rheological behavior, which should be closely related to the microscopic structure of the systems. With in situ small-angle neutron scattering complemented by rheological measurements, we investigated the deformation behavior of a charge-stabilized colloidal glass at particle level undergoing steady shear. A short-lived, localized elastic response at particle level, termed as the transient elasticity zone (TEZ), was identified from the neutron spectra. The existence of the TEZ, which could be promoted by the electrostatic interparticle potential, is a signature of deformation heterogeneity: the body of fluids under shear behaves like an elastic solid within the spatial range of the TEZ but like fluid outside the TEZ. The size of the TEZ shrinks as the shear rate increases in the shear thinning region, which shows that the shear thinning is accompanied by a diminishing deformation heterogeneity. More interestingly, the TEZ is found to be the structural unit that provides the resistance to the imposed shear, as evidenced by the quantitative agreement between the local elastic stress sustained by the TEZ and the macroscopic stress from rheological measurements at low and moderate shear rates. Ourmore » findings indicate an understanding on the nonlinear rheology of interacting colloidal glasses from a micro-mechanical view.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5];  [6];  [6];  [7];  [8]; ORCiD logo [6]
  1. Tsinghua Univ., Beijing (China); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Oita Univ., Oita (Japan)
  3. Inst. Laue-Langevin (ILL), Grenoble (France)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  6. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States
  7. National Center for Theoretical Sciences, Hsinchu (Taiwan)
  8. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1505304
Alternate Identifier(s):
OSTI ID: 1476119
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 21; Journal Issue: 1; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Wang, Zhe, Iwashita, Takuya, Porcar, Lionel, Wang, Yangyang, Liu, Yun, Sánchez-Díaz, Luis E., Wu, Bin, Huang, Guan-Rong, Egami, Takeshi, and Chen, Wei-Ren. Local elasticity in nonlinear rheology of interacting colloidal glasses revealed by neutron scattering and rheometry. United States: N. p., 2018. Web. doi:10.1039/C8CP05247F.
Wang, Zhe, Iwashita, Takuya, Porcar, Lionel, Wang, Yangyang, Liu, Yun, Sánchez-Díaz, Luis E., Wu, Bin, Huang, Guan-Rong, Egami, Takeshi, & Chen, Wei-Ren. Local elasticity in nonlinear rheology of interacting colloidal glasses revealed by neutron scattering and rheometry. United States. doi:10.1039/C8CP05247F.
Wang, Zhe, Iwashita, Takuya, Porcar, Lionel, Wang, Yangyang, Liu, Yun, Sánchez-Díaz, Luis E., Wu, Bin, Huang, Guan-Rong, Egami, Takeshi, and Chen, Wei-Ren. Fri . "Local elasticity in nonlinear rheology of interacting colloidal glasses revealed by neutron scattering and rheometry". United States. doi:10.1039/C8CP05247F. https://www.osti.gov/servlets/purl/1505304.
@article{osti_1505304,
title = {Local elasticity in nonlinear rheology of interacting colloidal glasses revealed by neutron scattering and rheometry},
author = {Wang, Zhe and Iwashita, Takuya and Porcar, Lionel and Wang, Yangyang and Liu, Yun and Sánchez-Díaz, Luis E. and Wu, Bin and Huang, Guan-Rong and Egami, Takeshi and Chen, Wei-Ren},
abstractNote = {The flow of colloidal suspensions is ubiquitous in nature and industry. Colloidal suspensions showcase a wide range of rheological behavior, which should be closely related to the microscopic structure of the systems. With in situ small-angle neutron scattering complemented by rheological measurements, we investigated the deformation behavior of a charge-stabilized colloidal glass at particle level undergoing steady shear. A short-lived, localized elastic response at particle level, termed as the transient elasticity zone (TEZ), was identified from the neutron spectra. The existence of the TEZ, which could be promoted by the electrostatic interparticle potential, is a signature of deformation heterogeneity: the body of fluids under shear behaves like an elastic solid within the spatial range of the TEZ but like fluid outside the TEZ. The size of the TEZ shrinks as the shear rate increases in the shear thinning region, which shows that the shear thinning is accompanied by a diminishing deformation heterogeneity. More interestingly, the TEZ is found to be the structural unit that provides the resistance to the imposed shear, as evidenced by the quantitative agreement between the local elastic stress sustained by the TEZ and the macroscopic stress from rheological measurements at low and moderate shear rates. Our findings indicate an understanding on the nonlinear rheology of interacting colloidal glasses from a micro-mechanical view.},
doi = {10.1039/C8CP05247F},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
number = 1,
volume = 21,
place = {United States},
year = {2018},
month = {9}
}

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