Long-Term Stability of n-Alkane-in-Water Pickering Nanoemulsions: Effect of Aqueous Solubility of Droplet Phase on Ostwald Ripening.

Langmuir : the ACS Journal of Surfaces and Colloids
Kate L ThompsonS P Armes

Abstract

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 nanoemul...Continue Reading

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Apr 7, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Kate L ThompsonSteven P Armes
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Oct 13, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Kate L ThompsonSteven P Armes
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Citations

Nov 27, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Qingqing LiuQin Wang
Dec 29, 2020·Advances in Colloid and Interface Science·Francesca RaveraLibero Liggieri
Mar 2, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Tahir MehmoodZaheer Ahmed
Mar 8, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Gieberth Rodriguez-LopezJhoan Toro-Mendoza
Mar 3, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Tahir Mehmood, Anwaar Ahmed
Dec 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Saul J Hunter, Steven P Armes
Dec 18, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Saul J HunterSteven P Armes

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Methods Mentioned

BETA
dynamic light scattering
NMR
X-ray
optical microscopy
by optical

Software Mentioned

Irena SAS
SOLEIL
LUMiSizer
Foxtrot

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