Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.8K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.8K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
1.8K
Magnetic Damping01:17

Magnetic Damping

791
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.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
791
Diamagnetism01:26

Diamagnetism

2.8K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.8K
Paramagnetism01:30

Paramagnetism

2.9K
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...
2.9K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

<i>In Situ</i> Imaging of Nanorod Adsorption and Assembly at Liquid Surfaces.

ACS nano·2026
Same author

Dynamic permeability in metastable droplet interfacial bilayers.

Soft matter·2026
Same author

Interfacial Inversion of Stealth Surfactants.

Journal of the American Chemical Society·2026
Same author

Synthesis of Asymmetric Bottlebrush Random Copolymers and Their Assembly in the Bulk and at Fluid Interfaces.

Angewandte Chemie (International ed. in English)·2026
Same author

Solid-Like yet Reconfigurable 3D-Printed Liquid Tubular Wires From Nonconductive Molecules.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

Surface Mobility of a Glass-Forming Polymer in an Ionic Liquid.

Macromolecules·2026

Related Experiment Video

Updated: Nov 17, 2025

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

5.6K

Ferromagnetic liquid droplets with adjustable magnetic properties.

Xuefei Wu1,2,3, Robert Streubel4,5,6, Xubo Liu1,2,3,7

  • 1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

Proceedings of the National Academy of Sciences of the United States of America
|February 19, 2021
PubMed
Summary

Researchers created magnetic liquid droplets (FMLDs) by jamming magnetic nanoparticles (NPs) at liquid interfaces. They explored tuning FMLDs

Keywords:
3D nanomagnetismferromagnetic liquid dropletliquid–liquid interfacemagnetic nanoparticle-surfactantsself-assembly

More Related Videos

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
12:37

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

12.7K
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

9.0K

Related Experiment Videos

Last Updated: Nov 17, 2025

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

5.6K
Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
12:37

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

12.7K
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

9.0K

Area of Science:

  • Soft Matter Physics
  • Nanotechnology
  • Fluid Dynamics

Background:

  • Magnetic nanoparticles (NPs) can assemble at liquid-liquid interfaces.
  • This assembly can create ferromagnetic liquid droplets (FMLDs) with tunable magnetization.
  • Understanding the factors influencing FMLD properties is crucial for applications.

Purpose of the Study:

  • To investigate the hydrodynamics and magnetization of FMLDs.
  • To explore methods for tuning FMLD properties via chemical, structural, and magnetic means.
  • To examine FMLD formation with mixtures of magnetic and nonmagnetic NPs.

Main Methods:

  • Utilized hydrodynamics experiments to study FMLDs.
  • Analyzed the role of jammed and dispersed magnetic NPs at the interface.
  • Investigated magnetic dipole-driven clustering of NP-surfactants.

Main Results:

  • FMLDs exhibit remanent magnetization due to interfacial jammed and coupled NPs.
  • FMLDs can form even with low concentrations of magnetic NPs when mixed with nonmagnetic NPs.
  • Magnetic dipole-driven clustering induces local magnetic properties, mimicking pure magnetic NP solutions.

Conclusions:

  • The magnetization and response of FMLDs are tunable through various parameters.
  • Mixing magnetic and nonmagnetic NPs facilitates FMLD formation and can lead to heterogeneous surfaces.
  • This platform offers potential for creating structured liquids with controllable magnetic behaviors.