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Related Experiment Video

Updated: Apr 19, 2026

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

Published on: January 28, 2018

Flexible and stretchable micromagnet arrays for tunable biointerfacing.

Peter Tseng¹, Jonathan Lin, Keegan Owsley

¹Department of Bioengineering, University of California, Los Angeles, 420 Westwood Plaza, 5121E Engineering V, Los Angeles, California, 90095, USA.

Advanced Materials (Deerfield Beach, Fla.)

|December 25, 2014

Summary

Researchers developed a method to pattern polydimethylsiloxane (PDMS) with magnetic structures. These flexible magnetic PDMS surfaces enable new ways to manipulate droplets and organize cells using magnetic fields.

Keywords:

biomagnetism bioseparation flexible electromagnetics magnetic droplet magnetic separation

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Laser Micromachining for Polymer Surface Topography Design

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Published on: September 19, 2025

Area of Science:

Materials Science
Microfluidics
Biotechnology

Background:

Polydimethylsiloxane (PDMS) is a versatile silicone elastomer widely used in microfluidics and biotechnology.
Controlling microscale phenomena often requires precise manipulation of fluids and materials.
Integrating magnetic properties into flexible materials offers new avenues for dynamic control.

Purpose of the Study:

To develop a novel method for surface patterning of PDMS with ferromagnetic microstructures.
To investigate the application of these magnetic PDMS structures in manipulating droplets and organizing cells.
To explore the potential of these functionalized substrates for advanced microscale applications.

Main Methods:

Surface patterning of PDMS using ferromagnetic materials with controlled sizes (micrometer to millimeter) and thicknesses (>70 μm).
Fabrication of flexible magnetic PDMS substrates.
Demonstration of magnetic droplet manipulation and cell organization using the functionalized substrates.

Main Results:

Successfully created PDMS surfaces patterned with ferromagnetic structures.
Demonstrated that the flexible magnetic PDMS substrates can confer dynamic, additive properties to various substrates (e.g., coverslips, Eppendorf tubes).
Observed novel modes of magnetic droplet manipulation and tunable steering of magnetic-cell organization.

Conclusions:

The developed process enables the creation of versatile magnetic PDMS materials.
These materials offer enhanced capabilities for controlling microscale systems, including droplet manipulation and cell organization.
The findings open possibilities for advanced applications in microfluidics, lab-on-a-chip devices, and biomanipulation.