DOI: 10.1063/1.2109907. Dynamic yielding, shear thinning, and stress rheology of polymer-particle suspensions and gels

Dynamic yielding, shear thinning, and stress rheology of polymer-particle suspensions and gels

10.1063/1.2109907

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The nonlinear rheological version of our barrier hopping theory for particle-polymer suspensions and gels has been employed to study the effect of steady shear and constant stress on the alpha relaxation time, yielding process, viscosity, and non-Newtonian flow curves. The role of particle volume fraction, polymer-particle size asymmetry ratio, and polymer concentration have been systematically explored. The dynamic yield stress decreases in a polymer-concentration- and volume-fraction-dependent manner that can be described as apparent power laws with effective exponents that monotonically increase with observation time. Stress- or shear-induced thinning of the viscosity becomes more abrupt with increasing magnitude of the quiescent viscosity. Flow curves show an intermediate shear rate dependence of an effective power-law form, becoming more solidlike with increasing depletion attraction. The influence of polymer concentration, particle volume fraction, and polymer-particle size asymmetry ratio on all properties is controlled to a first approximation by how far the system is from the gelation boundary of ideal mode-coupling theory (MCT). This emphasizes the importance of the MCT nonergodicity transition despite its ultimate destruction by activated barrier hopping processes. Comparison of the theoretical results with limited experimental studies is encouraging.

Bibliography

Kobelev, V., & Schweizer, K. S. (2005). Dynamic yielding, shear thinning, and stress rheology of polymer-particle suspensions and gels. The Journal of Chemical Physics, 123(16).

Authors 2

Vladimir Kobelev (first)
Kenneth S. Schweizer (additional)

References 36 Referenced 40

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{'volume-title': 'Liquids, Freezing and the Glass Transition', 'year': '1991', 'key': '2023080101594457600_c2a'} / Liquids, Freezing and the Glass Transition (1991)
10.1088/0953-8984/11/10A/002 / J. Phys.: Condens. Matter (1999)
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10.1103/PhysRevE.70.040401 / Phys. Rev. E (2004)
{'key': '2023080101594457600_c26'}

Dates

Type	When
Created	19 years, 10 months ago (Oct. 21, 2005, 6:02 p.m.)
Deposited	1 year, 6 months ago (Jan. 31, 2024, 1:10 a.m.)
Indexed	3 weeks, 6 days ago (July 30, 2025, 6:46 a.m.)
Issued	19 years, 10 months ago (Oct. 22, 2005)
Published	19 years, 10 months ago (Oct. 22, 2005)
Published Online	19 years, 10 months ago (Oct. 24, 2005)
Published Print	19 years, 10 months ago (Oct. 22, 2005)

Funders 0

None

BibTeX

@article{Kobelev_2005, title={Dynamic yielding, shear thinning, and stress rheology of polymer-particle suspensions and gels}, volume={123}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.2109907}, DOI={10.1063/1.2109907}, number={16}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Kobelev, Vladimir and Schweizer, Kenneth S.}, year={2005}, month=oct }

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