Directed self-assembly of a colloidal kagome lattice

Area of Science:

• Materials Chemistry
• Condensed Matter Physics
• Colloidal Science

Background:

• Designing complex superstructures from molecular or nanoscale building blocks is a significant challenge.
• Existing methods often rely on organic molecules, metal ions, or clusters.
• Translating these concepts to colloidal building blocks for new materials and properties remains largely unexplored.

Purpose of the Study:

• To demonstrate a method for inducing colloidal spheres to self-assemble into predetermined complex crystal structures.
• To explore the formation of a colloidal kagome lattice, an open network structure.
• To investigate the potential for creating functional materials with tailored pore characteristics.

Main Methods:

• Utilizing triblock Janus spheres with specific hydrophobic and electrostatic interaction patterns.
• Decorating colloidal sphere surfaces with hydrophobic domains to direct self-assembly.
• Fabricating easily manufacturable colloidal building blocks.

Main Results:

• Successfully induced self-assembly of colloidal spheres into a predetermined kagome lattice structure.
• The resulting kagome lattice is an open network, distinct from close-packed arrangements.
• The lattice exhibits two distinct pore families: one hydrophobic-rimmed and one hydrophilic.

Conclusions:

• A 'convergent' self-assembly strategy using colloidal building blocks can encode target architectures.
• This method allows for the creation of complex supracolloidal networks beyond simple periodic arrangements.
• The approach is versatile and can be extended to synthesize other supracolloidal networks with potential for enhanced functionality.