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Substrate wettability guided oriented self assembly of Janus particles.

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Substrate wettability dictates Janus particle orientation. Hydrophilic/hydrophobic surfaces control particle alignment, while neutral surfaces result in random orientation, enabling tailored functional coatings.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Surface Chemistry

Background:

  • Janus particles, with spatially inhomogeneous properties, are crucial for functional interfaces and solutions.
  • The influence of surface wettability on Janus particle self-assembly remains underexplored.

Purpose of the Study:

  • To investigate the role of substrate wettability in directing the orientation of amphiphilic metal-polymer Janus particles.
  • To understand the mechanisms governing substrate-wettability guided Janus particle assembly.

Main Methods:

  • Preparation of bifacial spherical Janus particles via topo-selective metal deposition on polystyrene (PS) particles.
  • Drop casting dilute dispersions of Janus colloids onto substrates with varying wettability.
  • Molecular dynamics simulations to analyze particle-substrate interactions and water molecule behavior.
  • Spin coating for creating ordered arrays of Janus particles.

Main Results:

  • Janus particles orient with hydrophobic (polymeric) or hydrophilic (metallic) sides facing upwards on hydrophobic and hydrophilic substrates, respectively.
  • Random orientation is observed on neutral substrates.
  • Molecular dynamics simulations reveal that water molecule arrangement and local densities near the substrate govern particle orientation.
  • Spin coating enables the formation of hexagonal close-packed arrays with controlled orientation on differential wettability substrates.

Conclusions:

  • Substrate wettability is a key factor in controlling the orientation of Janus particles during self-assembly.
  • Understanding these interactions allows for the design of functional coatings with specific particle orientations.
  • This work opens new avenues for substrate-wettability driven applications of Janus particles.