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 »
- Authors:
-
[1];
[4];
[6]
- Tsinghua Univ., Beijing (China); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Oita Univ., Oita (Japan)
- Inst. Laue-Langevin (ILL), Grenoble (France)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States
- National Center for Theoretical Sciences, Hsinchu (Taiwan)
- Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- 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
- Additional Journal Information:
- 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. https://doi.org/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. https://doi.org/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},
number = 1,
volume = 21,
place = {United States},
year = {Fri Sep 28 00:00:00 EDT 2018},
month = {Fri Sep 28 00:00:00 EDT 2018}
}
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Figures / Tables:
Fig. 1: (a) Illustration of the Rheo-SANS experiment under Couette geometry. 1, 2, and 3 denote the directions of flow (𝒗), velocity gradient (𝛁𝒗) and vorticity (𝝎), respectively. (b) Two-dimensional SANS spectra obtained from the flow-velocity gradient (𝒗−𝛁𝒗 or 1−2) plane and the flow-vorticity (𝒗−𝝎 or 1−3) plane at $𝛾̇$more »
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Works referencing / citing this record:
Connection between the anisotropic structure and nonlinear rheology of sheared colloidal suspensions investigated by Brownian dynamics simulations
journal, May 2019
- Sánchez-Diáz, Luis E.; Iwashita, Takuya; Egami, Takeshi
- Journal of Physics Communications, Vol. 3, Issue 5
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