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Updated: Jul 12, 2026

High Resolution Physical Characterization of Single Metallic Nanoparticles
Published on: June 28, 2019
"Nanoions": fundamental properties and analytical applications of charged nanoparticles
Kyle J M Bishop1, Bartosz A Grzybowski
1Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
Abstract:
Mixtures of oppositely charged nanoparticles (NPs) precipitate sharply only at the point of NP electroneutrality. This behavior-reminiscent of the threshold precipitation of inorganic ions-is specific to the nanoscale and can be attributed to the formation of like-charged NP clusters stabilized in solution by mutual electrostatic repulsions. NP titrations based on this phenomenon provide a uniquely accurate tool for measuring charges tethered onto nanoscopic objects and for studying the thermodynamics of surface reactions at the nanoscale.
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