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High Throughput Single-cell and Multiple-cell Micro-encapsulation
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Superlubricity Microcapsules.

Yi Zhang1, Hao Chen1,2, Kai Gao3

  • 1State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China.

ACS Applied Materials & Interfaces
|February 19, 2025
PubMed
Summary

Researchers achieved macroscale superlubricity in polymer composites using a microcapsule technique. This novel self-lubricating method releases oil on demand, significantly reducing friction.

Keywords:
macroscale superlubricitymicrocapsulepolymer compositesynergistic lubricationtribo-film

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Area of Science:

  • Materials Science
  • Tribology
  • Polymer Engineering

Background:

  • Superlubricity, defined by a coefficient of friction (COF) below 0.01, is well-established in various materials but rarely achieved in polymer composites.
  • Existing methods for achieving superlubricity often involve specific liquid lubricants or advanced materials like 2D and carbon-based structures.

Purpose of the Study:

  • To develop a novel method for achieving macroscale superlubricity in polymer composites.
  • To investigate the effectiveness of a microcapsule-based self-lubricating strategy for polymer materials.

Main Methods:

  • Fabrication of a polymer composite utilizing solid submicrometer capsules as matrix units and oil-containing microcapsules as lubricant fillers.
  • Testing the tribological performance of the composite under atmospheric conditions across a wide temperature range (0-200 °C).

Main Results:

  • Achieved robust macroscale superlubricity with a COF ranging from 0.003 to 0.009.
  • Demonstrated sustained superlubricity over sliding distances exceeding 500 m.
  • Observed the formation of a hydrodynamic film and a boundary tribo-film with ultralow shear strength due to released oil.

Conclusions:

  • The microcapsule technique provides an effective on-demand self-lubricating mechanism for polymer composites.
  • This approach offers a new pathway to realize superlubricity in polymer-based materials.
  • The findings have the potential to expand the engineering applications of superlubricity in demanding environments.