Discrete Electrolytes Research

Liquid ionics beyond Poisson-Boltzmann

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Publications: recent

31.

M. Zhang & J.R.T. Seddon
"Nanobubble–nanoparticle interactions in bulk solutions"
Langmuir 32, 11280 (2016)

Nanobubbles form stable colloids in supersaturated solutions. Here we demonstrate the ability of these solutions to interact with Au nanoparticle suspensions. The principle goal was to demonstrate particle modification, similar to froth flotation, and we do indeed see bubble−particle interactions. However, unlike in froth flotation, where bubble−particle interactions are driven mainly through collisions, for bulk nanobubble solutions we find that the principle interaction is through nucleation of new nanobubbles on the particles.

30.

J.S. McGrath, J. Quist, J.R.T. Seddon, S.C.S. Lai, S.G. Lemay, & H. L. Bridle
"Deformability assessment of waterborne protozoa using a microfluidic-enabled force microscopy probe"
PLoS ONE 11, e0150438 (2016)

Many modern filtration technologies are incapable of the complete removal of Cryptosporidium oocysts from drinking-water. Consequently, Cryptosporidium-contaminated drinking-water supplies can severely implicate both water utilities and consumers. Existing methods for the detection of Cryptosporidium in drinking-water do not discern between non-pathogenic and pathogenic species, nor between viable and non-viable oocysts. Using FluidFM, a novel force spectroscopy method employing microchannelled cantilevers for single-cell level manipulation, we assessed the size and deformability properties of two species of Cryptosporidium that pose varying levels of risk to human health. A comparison of such characteristics demonstrated the ability of FluidFM to discern between Cryptosporidium muris and Cryptosporidium parvum with 86% efficiency, whilst using a measurement throughput which exceeded 50 discrete oocysts per hour. In addition, we measured the deformability properties for untreated and temperature-inactivated oocysts of the highly infective, human pathogenic C. parvum to assess whether deformability may be a marker of viability. Our results indicate that untreated and temperature-inactivated C. parvum oocysts had overlapping but significantly different deformability distributions.

29.

M. Jitvisate & J.R.T. Seddon
"Local structure and flow properties of ionic liquids on charged and inert substrates"
J. Phys. Chem. C 120, 4860 (2016)

We extract the conservative and dissipative interactions of the ionic liquid [Emim]+[NTf2]- on mica and HOPG. Charge-mediated layering on mica locks the counter- ions strongly in place, resulting in several liquid layers forming as the wall effect is integrated out, as well as much greater damping between the layers as compared to the bulk. Template-mediated layering on HOPG is much weaker than its Coulombic counterpart. In terms of local flow properties, layers on HOPG can glide easier over each other as compared to the bulk. This clearly demonstrates the importance of substrate for controlling near-wall dynamic response.