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Self-assembly of inverse patchy colloids with tunable patch coverage.

Manigandan Sabapathy1, Remya Ann Mathews K, Ethayaraja Mani

  • 1Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai-600 036, India. ethaya@iitm.ac.in.

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Summary

We developed a method to create tunable inverse patchy colloidal particles (IPCs). Adding specific colloidal particles significantly enhances their self-assembly into controlled structures like chains and branched assemblies.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Self-Assembly

Background:

  • Inverse patchy colloidal particles (IPCs) exhibit unique interactions where patches repel and non-patch surfaces attract.
  • Controlling the self-assembly of these anisotropic particles is crucial for designing novel materials.

Purpose of the Study:

  • To develop a scalable technique for preparing IPCs with tunable patch coverage.
  • To investigate the self-assembly behavior of IPCs under varying conditions (patch coverage, electrolyte concentration, particle concentration).
  • To explore the use of negatively charged isotropic colloidal (NCIC) particles for tuning IPC self-assembly.

Main Methods:

  • Preparation of IPCs with controlled patch coverage.
  • Systematic variation of electrolyte and particle concentrations to study self-assembly.
  • Introduction of NCIC particles to influence IPC clustering efficiency and structure formation.
  • Quantitative analysis of self-assembled structures.

Main Results:

  • Identified distinct self-assembly regimes for IPCs: finite clusters, chain-like assemblies, and amorphous aggregates.
  • Observed formation of linear assemblies across a broad range of particle and salt concentrations, driven by anisotropic electrostatic interactions.
  • Demonstrated significant improvement in IPC clustering efficiency with NCIC addition, forming co-polymeric, flexible branched chains.
  • Classified clustering into finite-sized, linear, and dispersed states based on NCIC to IPC ratio.
  • Attributed structural evolution to seeding and crowding effects induced by NCIC particles.

Conclusions:

  • A simple and scalable method for preparing tunable IPCs is established.
  • Electrolyte and particle concentrations, along with anisotropic interactions, dictate IPC self-assembly pathways.
  • NCIC particles effectively control IPC self-assembly, enabling the formation of complex, tunable structures.
  • Seeding and crowding effects are key mechanisms by which NCIC particles influence self-assembly.