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Colloidally stable nanoparticle suspensions of iron hydroxide FeO(OH) at pH 2 have been prepared and shown to be non-magnetic. However, when the pH of the dispersion was raised to destabilise the suspension, aggregates near 200nm diameter were detected by Photon Correlation Spectroscopy (PCS), and these were influenced by magnetic fields in the 50kAm −1 range. These aggregates were unusual...
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