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Directed polystyrene/poly(methyl methacrylate) phase separation and nanoparticle ordering on transparent chemically

Saman Harirchian-Saei1, Michael C P Wang, Byron D Gates

  • 1Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC V8W 3V6, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 29, 2012
PubMed
Summary

This study reveals how to precisely pattern polymer blends and quantum dots using surface-directed phase separation. Optimized conditions ensure accurate replication of chemical patterns on substrates for advanced material applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Chemistry

Background:

  • Surface-directed phase separation is crucial for creating ordered nanostructures.
  • Controlling polymer blend morphology on patterned substrates remains challenging.

Purpose of the Study:

  • To investigate surface-directed phase separation of polystyrene/poly(methyl methacrylate) blends on patterned substrates.
  • To optimize experimental conditions for precise pattern replication.
  • To demonstrate the applicability of the technique for patterning quantum dots.

Main Methods:

  • Spin-coating of polymer blends (polystyrene/poly(methyl methacrylate)) onto octadecyltrichlorosilane (OTS)-glass substrates.
  • Utilizing tandem processes of spinodal decomposition and selective wetting.
  • Varying polymer concentration, blend composition, and solvent volatility.
  • Characterizing pattern replication and feature alignment.

Main Results:

  • Phase-separated polymers laterally arranged according to the chemical pattern on the substrate.
  • Optimal pattern replication achieved when phase separation length scale matched substrate feature dimensions.
  • Precise registration of polymer blend patterns with the substrate achieved at specific blend composition ratios (30/70 PS/PMMA).
  • Low-volatility solvents like toluene enabled domain coarsening for better pattern transfer.
  • Successful patterning of CdS quantum dots into microscale arrays.

Conclusions:

  • Surface-directed phase separation offers a route to control polymer blend morphology on patterned surfaces.
  • Optimized spin-coating conditions (concentration, composition, solvent) are key for accurate pattern replication.
  • The developed technique is versatile, enabling the patterning of both polymer blends and quantum dots.