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

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<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>

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