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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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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Types of Fluids01:27

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Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
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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 that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Alignment-Rheology Relationship of Biosourced Rod-Like Colloids and Polymers under Flow.

Marvin Detert1,2, Tatiana Porto Santos3, Amy Q Shen3

  • 1Physics of Fluids, Max Planck Center Twente for Complex Fluid Dynamics, and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

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Summary

This study reveals a universal relationship between the alignment of rod-like colloids and polymers and their viscosity. This finding simplifies predicting fluid behavior in applications like fiber spinning.

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Area of Science:

  • Rheology
  • Materials Science
  • Colloid Science

Background:

  • Fluids with rod-like colloids (RC) and polymers (RP) are vital for applications like fiber spinning.
  • Understanding the link between their flow-induced alignment and rheological properties is challenging.

Purpose of the Study:

  • To investigate the alignment-rheology relationship in biosourced RC and RP fluids.
  • To establish a universal trend connecting fluid structure and viscosity.

Main Methods:

  • Simultaneous measurement of shear viscosity and fluid anisotropy.
  • Rheometric shear flows applied to various biosourced RC and RP systems.

Main Results:

  • A universal trend was observed between specific viscosity (ηsp) and the alignment of RC and RP.
  • This trend was independent of concentration for all tested systems.
  • A dimensionless parameter (β) was developed to predict zero shear rate viscosity (η0,sp).

Conclusions:

  • A strong link exists between flow-induced structural changes and rheological properties in RC and RP fluids.
  • Findings can aid in developing constitutive models for predicting fluid behavior.
  • This research offers insights into the complex flow dynamics of rod-like particle suspensions.