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Photodeformable Azo Polymer Janus Particles Obtained upon Nonsolvent-Induced Phase Separation and Asynchronous

Chuyi Liao¹, Xiaogong Wang¹

¹Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing100084, People's Republic of China.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 4, 2022

Summary

This summary is machine-generated.

Submicron Janus particles made from azo polymer and PMMA were created using nonsolvent-induced phase separation. These photodeformable particles change shape when exposed to polarized light, offering potential for advanced materials.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Janus particles (JPs) are versatile nanomaterials with distinct properties on each hemisphere.
Controlling JP morphology and photomechanical response is crucial for advanced applications.

Purpose of the Study:

To fabricate submicron Janus particles (JPs) from epoxy-based azo polymer (BP-AZ-CN) and poly(methyl methacrylate) (PMMA).
To investigate the influence of nonsolvent-induced phase separation on JP formation and morphology.
To explore the photodeformable behavior of the fabricated JPs.

Main Methods:

Nonsolvent-induced phase separation by adding deionized water to a tetrahydrofuran (THF) solution of BP-AZ-CN and PMMA.
Ternary phase diagrams calculated using Flory-Huggins theory to analyze phase separation.
Controlled dilution and solvent evaporation to modify JP shape.
Laser irradiation (488 nm, linearly polarized) to assess photodeformability.

Main Results:

JPs were successfully fabricated, with phase separation driven by polymer incompatibility.
JP morphology and asymmetry were tunable by adjusting water content and dilution multiples.
BP-AZ-CN domains within the JPs exhibited significant elongation upon polarized laser irradiation.

Conclusions:

Nonsolvent-induced phase separation provides a viable route for creating asymmetric Janus particles.
The photomechanical response of JPs is linked to the BP-AZ-CN component and polarized light.
These photodeformable Janus particles hold promise for applications in responsive materials and actuators.