Sangam: A Confluence of Knowledge Streams

Interaction between Nearly Hard Colloidal Spheres at an Oil-Water Interface v2

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dc.contributor EPSRC - Engineering and Physical Sciences Research Council
dc.contributor University of Edinburgh
dc.contributor Muntz, Iain
dc.creator Muntz, Iain
dc.creator Hunter, Michael
dc.creator Waggett, Franceska
dc.creator Bartlett, Paul
dc.creator Marenduzzo, Davide
dc.creator Thijssen, Job H.J.
dc.creator Schofield, Andrew
dc.date 2020-06-11T10:56:49Z
dc.date 2020-06-11T10:56:49Z
dc.date.accessioned 2023-02-17T20:54:19Z
dc.date.available 2023-02-17T20:54:19Z
dc.identifier Muntz, Iain; Hunter, Michael; Waggett, Franceska; Bartlett, Paul; Marenduzzo, Davide; Thijssen, Job; Schofield, Andrew. (2020). Interaction between Nearly Hard Colloidal Spheres at an Oil-Water Interface v2, [dataset]. University of Edinburgh. https://doi.org/10.7488/ds/2848.
dc.identifier https://hdl.handle.net/10283/3660
dc.identifier https://doi.org/10.7488/ds/2848
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/244214
dc.description We show that the interaction potential between sterically stabilised, nearly hard-sphere (PMMA-PLMA) colloids at a water-oil interface has a negligible unscreened-dipole contribution, suggesting that models previously developed for charged particles at liquid interfaces are not necessarily applicable to sterically stabilised particles. Interparticle potentials, U(r), are extracted from radial distribution functions (g(r), measured by fluorescence microscopy) via Ornstein-Zernike (OZ) inversion and via a reverse Monte Carlo scheme. The results are then validated by particle tracking in a blinking optical trap. Using a Bayesian model comparison, we find that our PMMA-PLMA data is better described by screened monopole only rather than a functional form having a screened monopole plus an unscreened dipole term. We postulate that the long range repulsion we observe arises mainly through interactions between neutral holes on a charged interface i.e. the charge of the liquid interface cannot, in general, be ignored. In agreement with this interpretation, we find that the interaction can be tuned by varying salt concentration in the aqueous phase. Inspired by recent theoretical work on point charges at dielectric interfaces, which we explain is relevant here, we show that a screened 1/r^2 term can also be used to fit our data. Finally, we present measurements for PMMA-PHSA particles at a water-oil interface. These suggest that, for PMMA-PHSA particles, there is an additional contribution to the interaction potential. This is in line with our optical-tweezer measurements for PMMA-PHSA colloids in bulk oil, which indicate that they are slightly charged.
dc.format application/zip
dc.language eng
dc.publisher University of Edinburgh
dc.relation Muntz et al, Physical Review Research, Accepted
dc.relation https://datashare.is.ed.ac.uk/handle/10283/3638
dc.rights Creative Commons Attribution 4.0 International Public License
dc.subject Physical Sciences::Physics
dc.title Interaction between Nearly Hard Colloidal Spheres at an Oil-Water Interface v2
dc.type dataset


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