Magnetic assembly and annealing of colloidal lattices and superlattices

TL;DR

This paper presents a magnetic assembly and annealing method for creating and refining colloidal lattices and superlattices with various symmetries, overcoming limitations of traditional sedimentation techniques.

Contribution

The study introduces a magnetic approach to assemble and anneal colloidal lattices with complex symmetries, enabling faster and more versatile pattern formation.

Findings

Successful assembly of triangular, honeycomb, and kagome-like lattices

Use of binary mixtures to create diverse superlattices

Enhanced control over colloidal pattern complexity

Abstract

The ability to assemble mesoscopic colloidal lattices above a surface is important for fundamental studies related with nucleation and crystallization, but also for a variety of technological applications in photonics and micro-engineering. Current techniques based on particle sedimentation above a lithographic template are limited by a slow deposition process and by the use of static templates, which make difficult to implement fast annealing procedures. Here it is demonstrated a method to realize and anneal a series of colloidal lattices displaying triangular, honeycomb or kagome-like symmetry above a structure magnetic substrate. By using a binary mixture of particles, superlattices can be realized increasing further the variety and complexity of the colloidal patterns which can be produced.