Existence of a Precipitation Threshold in the Electrostatic Precipitation of Oppositely Charged Nanoparticles

Hideyuki Nakanishi, András Deák, Gábor Hólló, István Lagzi

doi:10.1002/ange.201809779

Existence of a Precipitation Threshold in the Electrostatic Precipitation of Oppositely Charged Nanoparticles

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Hideyuki Nakanishi

Department of Macromolecular Science and Engineering, Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Kyoto 606-8585 Japan
András Deák

Hungarian Academy of Sciences Centre for Energy Research Konkoly-Thege út 29–33 1120 Budapest Hungary
Gábor Hólló

MTA-BME Condensed Matter Research Group Budapest University of Technology and Economics 1111 Budafoki út 8 Budapest Hungary
István Lagzi

MTA-BME Condensed Matter Research Group Budapest University of Technology and Economics 1111 Budafoki út 8 Budapest Hungary

説明

<jats:title>Abstract</jats:title><jats:p>Oppositely charged nanoparticles precipitate rapidly only at the point of electroneutrality, wherein their charges are macroscopically compensated. We investigated the aggregation and precipitation of oppositely charged nanoparticles at concentrations ranging from 10 to 10<jats:sup>−3</jats:sup> m<jats:sc>m</jats:sc> (based on gold atoms) by using UV/Vis measurements. We employed solutions of equally sized (4.6 nm) gold nanoparticles, which were functionalized and stabilized with either positively or with negatively charged alkanethiols. Results showed that oppositely charged nanoparticles do not precipitate if their concentration is below a certain threshold even if the electroneutrality condition is fulfilled. This finding suggests a universal behavior of chemical systems comprising oppositely charged building blocks such as ions and charged nanoparticles.</jats:p>