The Role of Citric Acid in the Stabilization of Nanoparticles and Colloidal Particles in the Environment: Measurement of Surface Forces between Hafnium Oxide Surfaces in the Presence of Citric Acid

Shuhei Shinohara, Namsoon Eom, E. Jen Teh, Kaoru Tamada, Drew Parsons, Vincent S.J. Craig

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The interactions between colloidal particles and nanoparticles determine solution stability and the structures formed when the particles are unstable to flocculation. Therefore, knowledge of the interparticle interactions is important for understanding the transport, dissolution, and fate of particles in the environment. The interactions between particles are governed by the surface properties of the particles, which are altered when species adsorb to the surface. The important interactions in the environment are almost never those between the bare particles but rather those between particles that have been modified by the adsorption of natural organic materials. Citric acid is important in this regard not only because it is present in soil but also as a model of humic and fulvic acids. Here we have studied the surface forces between the model metal oxide surface hafnia in the presence of citric acid in order to understand the stability of colloidal particles and nanoparticles. We find that citric acid stabilizes the particles over a wide range of pH at low to moderate ionic strength. At high ionic strength, colloidal particles will flocculate due to a secondary minimum, resulting in aggregates that are dense and easily redispersed. In contrast, nanoparticles stabilized by citric acid remain stable at high ionic strengths and therefore exist in solution as individual particles; this will contribute to their dispersion in the environment and the uptake of nanoparticles by mammalian cells.

Original languageEnglish
Pages (from-to)2595-2605
Number of pages11
JournalLangmuir
Volume34
Issue number8
DOIs
Publication statusPublished - Feb 27 2018

Fingerprint

Hafnium oxides
hafnium oxides
citric acid
Citric acid
Citric Acid
Stabilization
stabilization
Ionic strength
Nanoparticles
nanoparticles
Humic Substances
Particle interactions
Flocculation
Oxides
Surface properties
Dissolution
Metals
Cells
Soils
Adsorption

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

The Role of Citric Acid in the Stabilization of Nanoparticles and Colloidal Particles in the Environment : Measurement of Surface Forces between Hafnium Oxide Surfaces in the Presence of Citric Acid. / Shinohara, Shuhei; Eom, Namsoon; Teh, E. Jen; Tamada, Kaoru; Parsons, Drew; Craig, Vincent S.J.

In: Langmuir, Vol. 34, No. 8, 27.02.2018, p. 2595-2605.

Research output: Contribution to journalArticle

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