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

S. Shinohara; N. Eom; E-J Teh; K. Tamada; D. Parsons; V.S.J. Craig

doi:10.1021/acs.langmuir.7b03116

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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

Journal article

Peer reviewed

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

S. Shinohara, N. Eom, E-J Teh, K. Tamada, D. Parsons and V.S.J. Craig

Langmuir, Vol.34(8), pp.2595-2605

2018

DOI: https://doi.org/10.1021/acs.langmuir.7b03116

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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.

Details

Title: 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
Authors/Creators: S. Shinohara (Author/Creator) - Kyushu University
N. Eom (Author/Creator) - Australian National University
E-J Teh (Author/Creator) - Australian National University
K. Tamada (Author/Creator) - Kyushu University
D. Parsons (Author/Creator) - Murdoch University
V.S.J. Craig (Author/Creator) - Australian National University
Publication Details: Langmuir, Vol.34(8), pp.2595-2605
Publisher: American Chemical Society
Identifiers: 991005542003907891
Murdoch Affiliation: School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.167 Microelectromechanical Systems; 2.167.555 Atomic Force Microscopy
Web Of Science research areas: Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary
ESI research areas: Chemistry