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Related Experiment Video

Updated: May 5, 2026

Generation of Alginate Microspheres for Biomedical Applications
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Super absorbent microsphere used for slow-release thickening.

Xinyue Zhang1, Yiming Gu1, Yan Luo2

  • 1College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China.

Journal of Colloid and Interface Science
|December 13, 2024
PubMed
Summary

This study introduces super absorbent microsphere emulsions as a novel solution for polymer flooding in oil recovery, overcoming limitations of traditional polymers. These microspheres offer enhanced viscosity and slow-release properties, improving tertiary oil recovery efficiency.

Keywords:
Inverse emulsion polymerizationMicrosphereSlow-releaseSuper absorbentTemperature-sensitive property

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Petroleum Engineering

Background:

  • Traditional linear polymers used in tertiary oil recovery face issues like premature injection and shear-induced viscosity loss.
  • A novel super absorbent microsphere emulsion is proposed to address these limitations.

Purpose of the Study:

  • To develop and characterize a new super absorbent microsphere emulsion for enhanced polymer flooding.
  • To evaluate the performance of these microspheres in terms of viscosity, stability, and water absorption at elevated temperatures.

Main Methods:

  • Core-shell polymer microspheres synthesized using inverse emulsion polymerization with acrylamide (AM), acrylic acid (AA), and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as core monomers, and AM and N-isopropylacrylamide (NIPAM) as shell monomers.
  • Characterization of microsphere properties including functional groups (FT-IR), morphology (SEM, TEM), and thermal stability (TGA).
  • Optimization of emulsifier concentration and shell-core ratio for particle size distribution and solid content.

Main Results:

  • Optimized microspheres (10 wt% emulsifier, 1:10 shell-core ratio) exhibited a concentrated particle size distribution around 220 nm.
  • Microspheres showed spherical morphology, high thermal stability, and significant size expansion (10x) after aging at 80°C for 48h.
  • The microsphere emulsion displayed low initial viscosity (1.78 mPa·s at 80°C) with a slow-release thickening effect (9.06 mPa·s after 48h at 70°C).
  • The emulsion exhibited shear-thinning at low shear rates and shear-thickening at high shear rates.

Conclusions:

  • The developed super absorbent microsphere emulsion demonstrates excellent water absorption and thickening properties at high temperatures (80°C).
  • Its slow-release thickening behavior and stability under shear make it a promising alternative to traditional polymers for enhanced oil recovery.
  • This novel system offers potential for improved polymer flooding efficiency in challenging reservoir conditions.