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Modulating Interactions between Molten Polystyrene and Porous Solids Using Atomic Layer Deposition.

Tian Ren1, Renjing Huang1, Raymond J Gorte1

  • 1Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 6, 2021
PubMed
Summary
This summary is machine-generated.

Atomic layer deposition (ALD) modifies silica nanoparticle surfaces to control polymer interactions. This method allows tuning polymer wetting on porous solids without altering pore structure, crucial for advanced materials.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Controlling polymer-solid interactions in nanoporous materials is vital for catalysis and nanocomposite fabrication.
  • Modifying pore surface chemistry is key, but challenging without affecting nanopore structure.

Purpose of the Study:

  • To demonstrate atomic layer deposition (ALD) for modulating polymer-nanoparticle interactions.
  • To investigate the effect of surface composition on polymer wetting in porous media.

Main Methods:

  • Disordered silica nanoparticle (NP) packings were modified with TiO2, WO3, and CaCO3 using ALD.
  • Surface coverage was estimated via mass gain and refractive index changes.
  • Polymer (polystyrene) infiltration time determined contact angles via capillarity.

Main Results:

  • ALD successfully altered NP surface composition, enabling tunable contact angles for polystyrene.
  • Contact angles varied significantly: SiO2 (20°), TiO2 (62°), WO3 (70°), CaCO3 (10°).
  • Polymer wetting did not strongly correlate with water contact angles, highlighting limitations of hydrophilicity-based predictions.

Conclusions:

  • ALD provides a method to precisely control polymer-surface interactions in nanoporous solids.
  • This technique is applicable to various polymer-surface systems for designing catalytic materials and composite films.
  • Predicting polymer wetting requires considering specific polymer-surface interactions beyond simple hydrophilicity.