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ZnO nanoparticle interactions with phospholipid monolayers

Vakurov, Alex; Guillermo, Mokry; Drummond-Brydson, Rik; Wallace, Rachel; Svendsen, Claus; Nelson, Andrew. 2013 ZnO nanoparticle interactions with phospholipid monolayers. Journal of Colloid and Interface Science, 404. 161-168. 10.1016/j.jcis.2013.05.010

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Abstract/Summary

Aqueous ZnO nanoparticle dispersions interaction with a dioleoyl phosphatidylcholine (DOPC) monolayer is reported in this paper. ZnO-DOPC interactions were investigated using rapid cyclic voltammetry (RCV) by focusing on the effect of the interactions on the characteristics of the capacitance current peaks representing two potential induced phase transitions. Results showed: - (1) The order of interaction of common commercially sourced nanoparticles with DOPC coated Hg electrodes was NanoTek>NanoShield>metals basis. This extent of interaction was inversely related to the ZnO particle size where the metals basis nanoparticles were strongly aggregated. The contribution of the non-ionic dispersant added by manufacturer to the NanoTek and NanoShield interaction was uncertain. (2) Freshly prepared aqueous Nanosun ZnO nanoparticle (~25 nm) dispersions interacted with and penetrated DOPC coated Hg electrodes. Aggregation of the nanoparticles, coating of the ZnO with phosphate and coating of the ZnO with fulvic acid minimised ZnO-DOPC interaction. (3) In-house synthesised ZnO nanoparticles of lower primary particle size (~6 nm) than Nanosun ZnO nanoparticles interacted strongly with DOPC coated Hg electrodes with no evidence of penetration of the nanoparticle in the DOPC monolayer. Even after considerable aggregation of the particle to between 1 and 10 μm, a strong interaction of the in-house synthesised ZnO with DOPC was observed.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.jcis.2013.05.010
CEH Sections: Acreman
ISSN: 0021-9797
Additional Keywords: zinc oxide nanoparticles, phospholipid monolayers, rapid cyclic voltammetry, particle size, particle aggregation
NORA Subject Terms: Ecology and Environment
Date made live: 24 Mar 2014 11:21 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/506536

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