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Paramagnetism

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...

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Updated: Jun 19, 2026

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

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

Published on: June 23, 2017

Multifunctional superparamagnetic Janus particles.

Kai P Yuet¹, Dae Kun Hwang, Ramin Haghgooie

¹Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 22, 2009

Summary

This summary is machine-generated.

Researchers developed a microfluidic method to create Janus magnetic hydrogel particles. These particles self-assemble into complex superstructures, offering potential for tissue engineering and other advanced applications.

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Area of Science:

Materials Science
Biotechnology
Nanotechnology

Background:

Hydrogel particles are versatile building blocks for advanced materials.
Controlling particle assembly is crucial for creating functional superstructures.
Janus particles offer unique properties due to their distinct surface chemistries.

Purpose of the Study:

To develop a microfluidic method for synthesizing multifunctional Janus hydrogel particles.
To investigate the anisotropic superparamagnetic properties and self-assembly behavior of these particles.
To explore the potential applications of these particles in tissue engineering and beyond.

Main Methods:

Microfluidic synthesis of Janus hydrogel particles.
Utilizing uniform magnetic fields for particle assembly.
Characterization of particle properties including magnetic anisotropy and chemical composition.

Main Results:

Successfully synthesized multifunctional Janus hydrogel particles with anisotropic superparamagnetic properties.
Demonstrated controllable self-assembly into chainlike and meshlike superstructures by modulating particle density and composition.
Showcased the ability to encapsulate biological substances and achieve selective surface functionalization.

Conclusions:

The developed microfluidic method provides a flexible platform for creating advanced Janus magnetic particles.
These particles serve as tunable building blocks for constructing complex hydrogel superstructures.
Potential applications span tissue engineering, photonic crystals, microelectronics, and sensing.