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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Microcapsules with tailored properties are crucial for diverse applications.
  • Controlling surface characteristics of microcapsules influences their functional performance.

Purpose of the Study:

  • To create hybrid cellulose microcapsules with tunable surface roughness and wetting properties.
  • To develop superamphiphobic surfaces using engineered microcapsules.
  • To demonstrate the encapsulation of functional nanoparticles within microcapsules.

Main Methods:

  • Nanoengineering the outer walls of precursor cellulose microcapsules.
  • In-situ formation of silica nanoparticles on microcapsule surfaces.
  • Utilizing different preparation routes to achieve varied surface roughness (raspberry-like vs. broccoli-like).
  • Encapsulating hydrophobic superparamagnetic nanoparticles (SPIONs) into the microcapsule core.

Main Results:

  • Achieved microcapsules with distinct surface topographies (raspberry or broccoli-like).
  • Demonstrated superamphobicity (contact angle >150°, roll-off angle <6°) on glass slides coated with broccoli-like microcapsules.
  • Showcased strong oleophobicity and hydrophobicity for raspberry-like microcapsule coatings.
  • Successfully created magnetic, superamphiphobic coatings on curved surfaces using SPION-loaded microcapsules and an external magnetic field.

Conclusions:

  • The nanoengineering approach allows precise control over microcapsule surface properties and wetting behavior.
  • Hybrid cellulose microcapsules offer a versatile platform for creating advanced functional surfaces.
  • The developed superamphiphobic coatings exhibit high performance for both aqueous and oil-based liquids.
  • The integration of magnetic nanoparticles enables facile manipulation and application of these coatings.