Measurements of submicron particle adsorption and particle film elasticity at oil-water interfaces

Manga, Mohamed S., Hunter, Timothy N., Cayre, Olivier J., York, David W., Reichert, Matthew D., Anna, Shelly L., Walker, Lynn M., Williams, Richard A. and Biggs, Simon R. (2016) Measurements of submicron particle adsorption and particle film elasticity at oil-water interfaces. Langmuir, 32 17: 4125-4133. doi:10.1021/acs.langmuir.5b04586

Author Manga, Mohamed S.
Hunter, Timothy N.
Cayre, Olivier J.
York, David W.
Reichert, Matthew D.
Anna, Shelly L.
Walker, Lynn M.
Williams, Richard A.
Biggs, Simon R.
Title Measurements of submicron particle adsorption and particle film elasticity at oil-water interfaces
Journal name Langmuir   Check publisher's open access policy
ISSN 1520-5827
Publication date 2016-05-03
Year available 2016
Sub-type Article (original research)
DOI 10.1021/acs.langmuir.5b04586
Open Access Status Not Open Access
Volume 32
Issue 17
Start page 4125
End page 4133
Total pages 9
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Abstract The influence of particle adsorption on liquid/liquid interfacial tension is not well understood, and much previous research has suggested conflicting behaviors. In this paper we investigate the surface activity and adsorption kinetics of charge stabilized and pH-responsive polymer stabilized colloids at oil/water interfaces using two tensiometry techniques: (i) pendant drop and (ii) microtensiometer. We found, using both techniques, that charge stabilized particles had little or no influence on the (dynamic) interfacial tension, although dense silica particles affected the “apparent” measured tension in the pendent drop, due to gravity driven elongation of the droplet profile. Nevertheless, this apparent change additionally allowed the study of adsorption kinetics, which was related qualitatively between particle systems by estimated diffusion coefficients. Significant and real interfacial tension responses were measured using ∼53 nm core–shell latex particles with a pH-responsive polymer stabilizer of poly(methyl methacrylate)-b-poly(2-(dimethylamino)ethyl methacrylate) (pMMA-b-pDMAEMA) diblock copolymer. At pH 2, where the polymer is strongly charged, behavior was similar to that of the bare charge-stabilized particles, showing little change in the interfacial tension. At pH 10, where the polymer is discharged and poorly soluble in water, a significant decrease in the measured interfacial tension commensurate with strong adsorption at the oil–water interface was seen, which was similar in magnitude to the surface activity of the free polymer. These results were both confirmed through droplet profile and microtensiometry experiments. Dilational elasticity measurements were also performed by oscillation of the droplet; again, changes in interfacial tension with droplet oscillation were only seen with the responsive particles at pH 10. Frequency sweeps were performed to ascertain the dilational elasticity modulus, with measured values being significantly higher than previously reported for nanoparticle and surfactant systems, and similar in magnitude to protein stabilized droplets.
Keyword Chemistry, Multidisciplinary
Chemistry, Physical
Materials Science, Multidisciplinary
Materials Science
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID EP/GS01521/1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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