Stability study of ZnO nanoparticles in aqueous solutions of carboxylate anions

Anna Godymchuk, Elizaveta Karepina, Elena Nikolaevna Yunda, Galina Lyamina, Natalia Kosova, Denis Kuznetsov

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1 Citation (Scopus)

Abstract

The paper is devoted to the use of carboxylic acids and salts for the elaboration of stable suspensions of ZnO engineered nanoparticles (40 and 200 nm) in physiological media at pH 6–8. It was shown that the aggregation degree of ZnO-200 particles increases with the growth of carboxylic anion activity, e.g., at pH 7 in the row «Acetate–Citrate3−–Oxalate2−» the average size of ZnO-200 particles in suspensions amounts to «169–523–770» nm, zeta potential–«35.9–−19.9–+5.42 mV», respectively. The aggregation degree of ZnO-40 particles increases in the row «Citrate3−–Acetate–Oxalate2−», at pH 7, the average size of ZnO-40 particles in suspension amounts to «50–121–430» nm, zeta potential–«−28.3–−14.5–+2.3» mV, respectively. pH-impact was found to be size-dependent: there was a significantly less effect of pH on adsorption, dispersion, and electrokinetic properties of ZnO-40 particles when compared to ZnO-200 particles. The main reason for the difference between micro- and nanosized particles behavior is a change of the ratio of acidic, basic, and neutral Bronsted centers for particles of nanosized scale.

Original languageEnglish
JournalJournal of Nanoparticle Research
Volume17
Issue number3
DOIs
Publication statusPublished - 1 Jan 2015

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Keywords

  • Acid–base surface properties
  • Carboxyl groups
  • Dispersion of nanoparticles
  • Nanoparticles
  • Nanoparticles aggregation
  • Zinc oxide

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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