Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

Ferromagnetism

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...

You might also read

Related Articles

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

Sort by

Same author

Multicentre international audit of IMACS malignancy screening guidelines in idiopathic inflammatory myopathies: insights from the myositis audit and research collaborative group.

RMD open·2026

Same author

Pharmacist-led communication strategies using social norm nudging and numerical information: a randomized field study on the willingness of Japanese patients to initiate treatment.

The International journal of pharmacy practice·2026

Same author

<i>In vivo</i> endoscopic visualization of the Micra AV2 retrieval interface.

European heart journal. Case reports·2026

Same author

Reply to the comment on "Association between periventricular white matter hyperintensities around the anterior horn and CSF tap test responsiveness in idiopathic normal pressure hydrocephalus".

Journal of the neurological sciences·2026

Same author

A case of gallbladder adenoma causing gallbladder haemorrhage.

Journal of surgical case reports·2026

Same author

Performance and potential impact of the IMACS cancer screening guideline in myositis: analysis in a myositis referral centre.

Rheumatology advances in practice·2026

Search research articles

Related Experiment Video

Updated: Jun 28, 2026

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Published on: October 19, 2015

Synthesis of Lophine-Modified Magnetite Nano-LEGO Blocks.

Takeru Iwamura^1,2, Naoki Osada², Kazuma Iwata²

¹Department of Applied Chemistry, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Tokyo 158-8557, Japan.

|December 8, 2025

Summary

Magnetite nano-LEGO blocks were synthesized for easy collection and redispersion. These magnetic nanoparticles aggregate into submicron particles for efficient separation and can be redispersed with LED light.

More Related Videos

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Published on: December 13, 2016

Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles

Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles

Published on: February 27, 2021

Related Experiment Videos

Last Updated: Jun 28, 2026

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Published on: October 19, 2015

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells

Published on: December 13, 2016

Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles

Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles

Published on: February 27, 2021

Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Nanosized materials pose environmental pollution risks.
Magnetite nanoparticles offer reversible dispersion and aggregation for easy collection.
Developing methods for controlled nanoparticle assembly and recovery is crucial.

Purpose of the Study:

To synthesize novel magnetite nano-LEGO blocks.
To achieve controlled aggregation and magnetic collection of nanoparticles.
To enable light-induced redispersion of aggregated nanoparticles.

Main Methods:

Williamson ether synthesis to modify magnetite nanoparticles.
Surface functionalization with lophine skeletons.
Oxidation reaction using potassium ferricyanide for aggregation.
LED light irradiation for redispersion.

Main Results:

Successfully synthesized magnetite nano-LEGO blocks with lophine skeletons.
Achieved aggregation into submicron particles (~280 nm) via oxidation.
Demonstrated high-yield magnetic collection of aggregated particles.
Showcased reversible redispersion of particles upon LED light exposure.

Conclusions:

Magnetite nano-LEGO blocks provide a novel approach for nanoparticle management.
The developed method allows for efficient magnetic collection and light-triggered redispersion.
This technology has potential applications in environmental remediation and materials processing.