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Three-dimensional positioning and control of colloidal objects utilizing engineered liquid crystalline defect

H Yoshida¹, K Asakura¹, J Fukuda²

¹Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.

Nature Communications

|May 22, 2015

Summary

Researchers created complex 3D liquid crystal defect lines on flat surfaces using patterned substrates. These defects act as templates to build and reconfigure colloidal superstructures with low voltage, enabling new material applications.

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Area of Science:

Materials Science
Soft Matter Physics
Liquid Crystal Technology

Background:

Topological defects in liquid crystals influence material properties and can template colloidal assembly.
Previous methods for complex defect generation required curved geometries or specialized colloids, limiting device applications.

Purpose of the Study:

To demonstrate controlled generation of 3D liquid crystal defect lines with non-trivial shapes and chirality on flat substrates.
To utilize these engineered defects as templates for constructing reconfigurable colloidal superstructures.

Main Methods:

Utilizing topologically patterned substrates to guide the formation of 3D defect lines in a nematic liquid crystal slab.
Employing the electric response of liquid crystals to assemble and manipulate colloidal objects along defect templates.

Main Results:

Successful controlled generation of 3D liquid crystal defect lines with complex shapes and chirality on flat surfaces.
Construction of colloidal superstructures templated by these defect lines.
Reversible reconfiguration of colloidal superstructures at voltages as low as 1.3 V.

Conclusions:

Topologically patterned substrates offer a versatile method for 3D defect engineering in liquid crystals.
This approach enables the creation of reconfigurable colloidal superstructures with potential applications in self-healing composites and artificial frustrated phases.