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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Colloidal gels tuned by oscillatory shear.

Esmaeel Moghimi1, Alan R Jacob1, Nick Koumakis2

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Oscillatory shear flow tunes colloidal gel properties by altering microstructure. Different strain amplitudes create distinct gel structures, influencing mechanical strength and yielding behavior for efficient material property control.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Colloid Science

Background:

  • Colloidal gels are complex fluids with tunable properties.
  • Understanding their response to shear flow is crucial for material design.
  • Microstructural changes dictate macroscopic mechanical behavior.

Purpose of the Study:

  • To investigate microstructural and mechanical changes in colloidal gels under oscillatory shear.
  • To compare oscillatory shear with steady shear flow for tuning gel properties.
  • To correlate shear-induced structural heterogeneity with mechanical response and yielding.

Main Methods:

  • Rheometry was used to measure mechanical properties.
  • Brownian Dynamics (BD) simulations modeled colloidal gel behavior.
  • A model depletion colloid-polymer mixture (hard sphere suspension + linear polymers) was employed.

Main Results:

  • Three distinct regimes were observed based on oscillatory shear strain amplitude.
  • Large strains created homogenous, stronger gels; intermediate strains yielded heterogeneous, weak gels; low strains produced less heterogeneous, stronger solids.
  • Oscillatory shear induced greater structural heterogeneity than steady shear flow.

Conclusions:

  • Oscillatory shear is a highly effective method for tuning colloidal gel mechanical properties.
  • Shear-induced structural heterogeneity is key to observed mechanical responses.
  • Pre-shearing conditions significantly impact the nonlinear yielding behavior of colloidal gels.