"Nanoions": fundamental properties and analytical applications of charged nanoparticles. |
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| Authors: | Kyle J M Bishop Bartosz A Grzybowski |
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| Institution: | Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA. |
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| 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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| Keywords: | analytical methods charge measurements colloids electrostatic interactions nanoparticles |
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