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Updated: Sep 30, 2025

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

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Published on: June 23, 2017

Multifunctional Photonic Janus Particles.

Qilin He¹, Harikrishnan Vijayamohanan¹, Jie Li¹

¹Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society

|March 17, 2022

Summary

This summary is machine-generated.

Researchers developed tunable photonic Janus particles from block copolymers. These particles exhibit angle-dependent structural colors, enabling applications in magnetic control and sensitive biosensing, including pathogen detection.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

Area of Science:

Materials Science
Nanotechnology
Polymer Chemistry

Background:

Photonic particles offer tunable optical properties.
Janus particles possess distinct surface chemistries for multifunctional applications.
Block copolymers are versatile building blocks for self-assembly.

Purpose of the Study:

To synthesize novel photonic Janus particles using phase-separated block copolymers.
To achieve tunable structural colors and magnetic responsiveness.
To demonstrate potential applications in biosensing, specifically for pathogen detection.

Main Methods:

Fabrication of photonic Janus particles via solvent evaporation of oil-in-water emulsions using dendronized brush block copolymers (den-BBCP) and poly(4-vinylpyridine)-r-polystyrene (P4VP-r-PS).
Self-assembly of den-BBCP to form ordered lamellar structures responsible for structural colors.
Surface modification of the P4VP-r-PS phase with Fe3O4 nanoparticles for magnetic control and antibody immobilization for biosensing.

Main Results:

Successfully created sphere-cone shaped photonic Janus particles with angle-dependent structural colors tunable across the visible spectrum by adjusting den-BBCP molecular weight.
Achieved real-time magnetic control of reflected color by coating with Fe3O4 nanoparticles.
Demonstrated electrostatic immobilization of antibodies onto the Fe3O4 surface for biosensing applications.

Conclusions:

Developed multifunctional photonic Janus particles with tunable structural colors and magnetic responsiveness.
Validated the potential of these particles for sensitive biosensing, exemplified by a Salmonella detection sensor.
Highlighted the significance of angle-dependent structural color in the sensing mechanism.