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

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI: https://doi.org/10.1039/C8CP05247F · OSTI ID:1505304
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)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1505304
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 1 Vol. 21; ISSN 1463-9076; ISSN PPCPFQ
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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