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Related Experiment Video

Updated: Jul 15, 2026

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

Superparamagnetic nanoparticles in tap water.

Frank E Senftle¹, Arthur N Thorpe, Julius R Grant

¹Department of Physics and Astronomy, Howard University, Washington, DC 20059, USA.

|May 15, 2007

Summary

Magnetization measurements reveal particle sizes in water pipes, crucial for understanding hazardous substance adsorption. This helps characterize corrosion products in both flowing and stagnant water systems.

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Last Updated: Jul 15, 2026

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Published on: June 9, 2016

Area of Science:

Materials Science
Environmental Science
Analytical Chemistry

Background:

Corrosion of iron and steel municipal water pipes generates fine particles.
These particles can adsorb hazardous substances, impacting water quality.
Understanding particle size is key to assessing adsorption capacity.

Purpose of the Study:

To characterize corrosion product particles in municipal water using magnetic measurements.
To determine the size distribution of superparamagnetic particles in flowing and stagnant water.
To investigate the role of particle size in hazardous species adsorption.

Main Methods:

Utilized magnetization measurements to analyze corrosion product particles.
Applied methodology to water samples from flowing and stagnant tap water systems.
Characterized particle sizes ranging from nanometers to micrometers.

Main Results:

Flowing water contained multidomain ferromagnetic particles (>100 nm) and aggregates of superparamagnetic particles (3.2-5.6 nm).
Stagnant water samples showed small superparamagnetic particles (3.2-5.6 nm) and larger subdomain particles (59-67 nm).
Both particle sizes were found to be trapped by charcoal in household water filters.

Conclusions:

Magnetization measurements are effective for characterizing corrosion product particle sizes.
Particle size influences the adsorption of hazardous species in water systems.
Findings have implications for water quality management and filtration technologies.