期刊
NANO LETTERS
卷 20, 期 7, 页码 4837-4841出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00709
关键词
emulsion inversion; interfaces; iPAINT; pH dependency; size dependency; super-resolution microscopy
类别
资金
- Dutch Science Foundation (NWO VIDI) [723.014.006]
- Dutch Ministry of Education, Culture and Science (Gravity Program) [024.001.035]
Pickering emulsions are increasingly applied in the production of medicines, cosmetics, and in food technology. To apply Pickering emulsions in a rational manner it is insufficient to examine properties solely on a macroscopic scale, as this does not elucidate heterogeneities in contact angles (theta) of individual particles, which may have a profound impact on stability and microstructure. Here, we apply the super-resolution technique iPAINT to elucidate for the first time the microscopic origins of macroscopically observed emulsion phase inversions induced by a variation in particle size and aqueous phase pH. We find theta of single carboxyl polystyrene submicron particles (CPS) significantly decreases due to increasing aqueous phase pH and particle size, respectively. Our findings confirm that theta of submicron particles are both size- and pH-dependent. Interestingly, for CPS stabilized water-octanol emulsions, this enables tuning of emulsion type from water-in-oil to oil-in-water by adjustments in either particle size or pH.
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