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Related Experiment Video

Updated: May 21, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

High-force NdFeB-based magnetic tweezers device optimized for microrheology experiments.

Jun Lin1, Megan T Valentine

  • 1Department of Mechanical Engineering, University of California, Santa Barbara, California 93106, USA.

The Review of Scientific Instruments
|June 7, 2012
PubMed
Summary

We developed a new magnetic tweezers system for microrheology, capable of applying large forces to soft materials. This advanced tool allows precise measurement of viscoelastic properties in various biological and material science applications.

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Area of Science:

  • Biophysics
  • Materials Science
  • Soft Matter Physics

Background:

  • Microrheology is crucial for understanding the mechanical properties of soft materials.
  • Existing magnetic tweezers often have limitations in force range and sample compatibility.
  • Accurate force application is essential for reliable microrheology measurements.

Purpose of the Study:

  • To design, calibrate, and test a novel magnetic tweezers device.
  • To enable the application of large forces for microrheology experiments on soft materials.
  • To achieve high-resolution measurements of viscoelastic moduli.

Main Methods:

  • Utilized two pairs of neodymium iron boron magnets with steel focusing tips.
  • Employed paramagnetic beads (∼4.5 μm) for force application.

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Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Related Experiment Videos

Last Updated: May 21, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

  • Integrated a high-speed camera, custom LED illumination, and a stabilized platform.

    • Main Results:

    • The device applies forces in the range of 1-1800 pN.
    • Operates with magnet-bead separations from 0.3-20 mm, compatible with standard sample geometries.
    • Successfully measured viscoelastic moduli up to ∼1 kPa.

    Conclusions:

    • The developed magnetic tweezers offer a versatile and powerful tool for microrheology.
    • The design facilitates large force application and high-resolution measurements of soft materials.
    • This system advances the study of material viscoelasticity in various scientific fields.