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Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Real-time manipulation with magnetically tunable structures.

Yangying Zhu¹, Dion S Antao, Rong Xiao

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

Advanced Materials (Deerfield Beach, Fla.)

|July 23, 2014

Summary

Researchers developed magnetically tunable micropillar arrays capable of extreme, uniform tilt angles for real-time manipulation. These flexible uniform responsive microstructures (μFUR) offer dynamic control over liquid spreading, fluid drag, and optical properties.

Keywords:

directional wettability dynamic material magnetic real-time manipulation tunable surface

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Area of Science:

Materials Science
Microfluidics
Nanotechnology

Background:

Micropillar arrays are used in various applications, but achieving uniform and controllable tilt angles remains a challenge.
Real-time manipulation of microstructures is crucial for advanced functionalities.

Purpose of the Study:

To report magnetically tunable micropillar arrays with uniform and extreme tilt angles.
To develop a model for accurately capturing the behavior of these microstructures.
To demonstrate the application of these microstructures in dynamic manipulation tasks.

Main Methods:

Fabrication of micropillar arrays.
Application of magnetic fields for tuning tilt angles.
Experimental characterization of tilt angles (0° to 57°).
Development of a theoretical model to predict microstructure behavior.

Main Results:

Achieved uniform tilt angles from 0° to 57°.
Demonstrated dynamic control over liquid spreading directionality.
Showcased the ability to control fluid drag.
Tuned optical transmittance over a large range using the microstructures.

Conclusions:

Magnetically tunable micropillar arrays offer precise, real-time control over microstructural orientation.
Flexible uniform responsive microstructures (μFUR) have significant potential in microfluidic devices, adaptive optics, and tunable surfaces.