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Polysaccharide conformation and dispersion significantly impact shear-thickening fluids (STFs). Well-dispersed xylan nanocrystals (XNCs) and soluble xylan ethers enhance STF thickening properties, offering new possibilities for fluid additives.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Polymer Chemistry

Background:

  • Polysaccharide behavior in solution (dissolved, dispersed, aggregated) dictates bulk fluid properties.
  • The impact of polysaccharide nanostructures and solution states on rheology is under-explored.
  • Non-Newtonian shear-thickening fluids (STFs) are sensitive to their microstructural components.

Purpose of the Study:

  • To investigate how xylan conformation and dispersion influence the rheology of STFs.
  • To synthesize xylan derivatives with controlled dispersibility and solubility.
  • To quantify the effects of polysaccharide structure on STF thickening behavior.

Main Methods:

  • Synthesis of xylan nanocrystals (XNCs) and water-soluble xylan ethers.
  • Characterization of xylan dispersibility (well-dispersed vs. aggregated) and solubility.
  • Rheological testing of SiO2/poly(ethylene oxide) STFs modified with different xylan forms.

Main Results:

  • Well-dispersed XNCs and room-temperature-soluble xylan ethers significantly enhanced STF thickening.
  • The critical shear rate was reduced by two orders of magnitude.
  • Peak viscosity increased by 880% with optimal xylan additives.

Conclusions:

  • Polysaccharide conformation and dispersion are critical factors influencing STF rheology.
  • Tailoring polysaccharide structure offers a novel approach to control STF properties.
  • This research opens avenues for utilizing polysaccharides as effective fluid additives.