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Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening
High-pressure microfluidization is used to prepare a series of oil-in-water Pickering nanoemulsions using sterically-stabilized diblock copolymer nanoparticles as the Pickering emulsifier. The droplet phase comprised either n-octane, n-decane, n-dodecane, or n-tetradecane. This series of oils enable...
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| Format: | Default Article |
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2018
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| Online Access: | https://hdl.handle.net/2134/9810566.v1 |
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| _version_ | 1818168095481528320 |
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| author | Kate L Thompson Matthew J Derry Fiona Hatton Steven P Armes |
| author_facet | Kate L Thompson Matthew J Derry Fiona Hatton Steven P Armes |
| author_sort | Kate L Thompson (7376063) |
| collection | Figshare |
| description | High-pressure microfluidization is used to prepare a series of oil-in-water Pickering nanoemulsions using sterically-stabilized diblock copolymer nanoparticles as the Pickering emulsifier. The droplet phase comprised either n-octane, n-decane, n-dodecane, or n-tetradecane. This series of oils enabled the effect of aqueous solubility on Ostwald ripening to be studied, which is the primary instability mechanism for such nanoemulsions. Analytical centrifugation (LUMiSizer instrument) was used to evaluate the long-term stability of these Pickering nanoemulsions over time scales of weeks/months. This technique enables convenient quantification of the fraction of growing oil droplets and confirmed that using n-octane (aqueous solubility = 0.66 mg dm-3 at 20 °C) leads to instability even over relatively short time periods. However, using n-tetradecane (aqueous solubility = 0.386 μg dm-3 at 20 °C) leads to significantly improved long-term stability with respect to Ostwald ripening, with all droplets remaining below 1 μm diameter after 6 weeks storage at 20 °C. In the case of n-dodecane, the long-term stability of these new copolymer-stabilized Pickering nanoemulsions is significantly better than the silica-stabilized Pickering nanoemulsions reported in the literature by Persson et al. (Colloids Surf., A, 2014, 459, 48-57). This is attributed to a much greater interfacial yield stress for the former system, as recently described in the literature (see P. J. Betramo et al. Proc. Natl. Acad. Sci. U.S.A., 2017, 114, 10373-10378). |
| format | Default Article |
| id | rr-article-9810566 |
| institution | Loughborough University |
| publishDate | 2018 |
| record_format | Figshare |
| spelling | rr-article-98105662018-07-12T00:00:00Z Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening Kate L Thompson (7376063) Matthew J Derry (7375970) Fiona Hatton (5731820) Steven P Armes (1305918) Nano-emulsions Nanocomposite particles Latex-particles Oil Ph Colloidosomes Optimization Temperature Emulsifiers Surfactants High-pressure microfluidization is used to prepare a series of oil-in-water Pickering nanoemulsions using sterically-stabilized diblock copolymer nanoparticles as the Pickering emulsifier. The droplet phase comprised either n-octane, n-decane, n-dodecane, or n-tetradecane. This series of oils enabled the effect of aqueous solubility on Ostwald ripening to be studied, which is the primary instability mechanism for such nanoemulsions. Analytical centrifugation (LUMiSizer instrument) was used to evaluate the long-term stability of these Pickering nanoemulsions over time scales of weeks/months. This technique enables convenient quantification of the fraction of growing oil droplets and confirmed that using n-octane (aqueous solubility = 0.66 mg dm-3 at 20 °C) leads to instability even over relatively short time periods. However, using n-tetradecane (aqueous solubility = 0.386 μg dm-3 at 20 °C) leads to significantly improved long-term stability with respect to Ostwald ripening, with all droplets remaining below 1 μm diameter after 6 weeks storage at 20 °C. In the case of n-dodecane, the long-term stability of these new copolymer-stabilized Pickering nanoemulsions is significantly better than the silica-stabilized Pickering nanoemulsions reported in the literature by Persson et al. (Colloids Surf., A, 2014, 459, 48-57). This is attributed to a much greater interfacial yield stress for the former system, as recently described in the literature (see P. J. Betramo et al. Proc. Natl. Acad. Sci. U.S.A., 2017, 114, 10373-10378). 2018-07-12T00:00:00Z Text Journal contribution 2134/9810566.v1 https://figshare.com/articles/journal_contribution/Long-term_stability_of_n-alkane-in-water_pickering_nanoemulsions_Effect_of_aqueous_solubility_of_droplet_phase_on_Ostwald_ripening/9810566 CC BY 4.0 |
| spellingShingle | Nano-emulsions Nanocomposite particles Latex-particles Oil Ph Colloidosomes Optimization Temperature Emulsifiers Surfactants Kate L Thompson Matthew J Derry Fiona Hatton Steven P Armes Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening |
| title | Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening |
| title_full | Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening |
| title_fullStr | Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening |
| title_full_unstemmed | Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening |
| title_short | Long-term stability of n-alkane-in-water pickering nanoemulsions: Effect of aqueous solubility of droplet phase on Ostwald ripening |
| title_sort | long-term stability of n-alkane-in-water pickering nanoemulsions: effect of aqueous solubility of droplet phase on ostwald ripening |
| topic | Nano-emulsions Nanocomposite particles Latex-particles Oil Ph Colloidosomes Optimization Temperature Emulsifiers Surfactants |
| url | https://hdl.handle.net/2134/9810566.v1 |