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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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In structural analysis, singularity functions are crucial in simplifying the representation of shear forces in beams under discontinuous loading. These functions describe discontinuous  variations in shear force across a beam with varying loads by using a single mathematical expression, regardless of the complexity of the loading conditions. The singularity functions are derived from creating a free-body diagram of the beam and then making conceptual cuts at specific points to examine the...
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A Shear Thickening Colloidal Suspension Functioning via Progressive Impact Jamming with Persistent Lubrication Layer.

Yiran Wu1,2, Yifeng Yu1, Yiqiu Zhao3

  • 1Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 20, 2026
PubMed
Summary

This study explores ionic liquid-based shear thickening fluids (ILSTFs) in jamming dynamics. ILSTFs show lubricated behavior during shear thickening and impact-induced jamming, revealing a progressive jamming mechanism.

Keywords:
ionic liquid‐based shear thickening fluidlubrication layermodified added mass modelprogressive jamming

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Rheology

Background:

  • Conventional shear thickening fluids (STFs) and their jamming dynamics are well-researched.
  • Existing models explain hydrodynamics, lubrication breakdown, and interparticle friction in STFs.

Purpose of the Study:

  • To investigate the jamming dynamics of ionic liquid-based shear thickening fluids (ILSTFs).
  • To explore the lubricated nature of ILSTFs during shear thickening and impact-induced solidification.
  • To develop a model for jamming dynamics in ILSTFs.

Main Methods:

  • Rheology tests to characterize shear thickening behavior.
  • Dynamic normal impact tests to trigger jamming and solidification.
  • Development and application of a Modified Added Mass Model based on the Impact-Activated Normal Solidification (IANS) framework.

Main Results:

  • ILSTFs exhibit lubricated behavior not only in strong shear thickening but also during jamming and solidification.
  • A solvation layer of a few nanometers lubricates silica nanoparticles during impact jamming.
  • The solvation layer thickness decreases due to squeezing from increasing stress, defining a progressive jamming realm.

Conclusions:

  • Ionic liquid-based shear thickening fluids demonstrate unique lubricated jamming dynamics.
  • The Modified Added Mass Model accurately describes jamming with a solid boundary.
  • The findings introduce a new understanding of progressive jamming in ILSTFs.