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

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...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Damping01:17

Magnetic Damping

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...
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...

You might also read

Related Articles

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

Sort by
Same author

Understanding Discharge-Driven Growth of Cathode Impedance in Ni-Rich NMC Cathodes.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same author

Microwave-Assisted Rapid Extraction of Oleuropein from Olive Leaf By-Product and Processing into Oleuropein@Zeolite Nanohybrids for Antioxidant Food Applications (Fortified Salt and Active Gelatin Films).

Molecules (Basel, Switzerland)·2026
Same author

Correction to "Biodegradable Electrospun Conduit with Aligned Fibers Based on Poly(lactic-co-glycolic Acid) (PLGA)/Carbon Nanotubes and Choline Bitartrate Ionic Liquid".

ACS applied bio materials·2026
Same author

Shell-Free CuInS<sub>2</sub> Nanocrystals with Near-Unity Photoluminescence for Deep-Red LEDs.

ACS applied optical materials·2026
Same author

Dual Role of Ionic Liquids as Plasticizer and Co-Foaming Agent of Polylactide Matrix.

Polymers·2025
Same author

Plasticulture Functionalized with Pesticides for Sustainable Crop Protection: A Systematic Review.

Journal of agricultural and food chemistry·2025

Related Experiment Video

Updated: May 9, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Self-suspended permanent magnetic FePt ferrofluids.

Panagiotis Dallas1, Antonios Kelarakis, Ritu Sahore

  • 1Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.

Journal of Colloid and Interface Science
|July 18, 2013
PubMed
Summary

We developed novel self-suspended ferrofluids using ionic liquids and L10 FePt nanoparticles, achieving room temperature remanent magnetization without aggregation. These stable magnetic fluids offer tunable properties for advanced applications.

Keywords:
FePtFerrofluidsIonic liquidThiol

More Related Videos

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
11:01

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention

Published on: September 18, 2015

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
10:23

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Published on: December 13, 2016

Related Experiment Videos

Last Updated: May 9, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
11:01

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention

Published on: September 18, 2015

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
10:23

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Published on: December 13, 2016

Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Traditional ferrofluids often use volatile solvents or superparamagnetic nanoparticles lacking permanent magnetization.
  • Achieving stable, self-suspended ferrofluids with remanent magnetization is a significant challenge.

Purpose of the Study:

  • To synthesize and characterize a new class of self-suspended ferrofluids with room temperature remanent magnetization.
  • To investigate the role of ionic liquid chemisorption on nanoparticle stability and magnetic properties.

Main Methods:

  • Chemisorption of thiol-terminated ionic liquid onto L10 FePt nanoparticles.
  • Characterization using Raman spectroscopy and thermal analysis.
  • Rheological measurements and magnetic property evaluation at varying FePt loadings.

Main Results:

  • Successful synthesis of stable ferrofluids via strong ionic liquid chemisorption, preventing flocculation.
  • Composites with 40-70 wt% FePt showed pseudo solid-like behavior and high remanent magnetization (10.1-12.8 emu/g).
  • 12 wt% FePt loading resulted in liquid-like behavior with remanent and saturation magnetization of 3.5 and 6.2 emu/g.

Conclusions:

  • The developed ferrofluids exhibit stable self-suspension and remanent magnetization at room temperature.
  • Magnetic and rheological properties are tunable by controlling FePt nanoparticle type and concentration.
  • This work presents a promising platform for advanced magnetic fluid applications.