Journal
LANGMUIR
Volume 33, Issue 49, Pages 14011-14019Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.7b02549
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Funding
- European Science Foundation COST Actions [MP1106, CM1101]
- European Space Agency (projects FASES, PASTA and MATRA)
- CNES
- GdRCNRS MFA
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An experimental investigation of spontaneous emulsification is proposed with a water drop pendant in a paraffin oil (PO) solution loaded with a surfactant (SPAN80). Optical microscopy in a transmission mode is employed for high-spatial resolution image recording. The kinetics of spontaneous emulsification is studied. It is shown to generate a darkening of the drops because of interface modification with a characteristic time that depends upon the SPAN80 concentration. For low concentrations, spontaneous emulsification is slow and produces micrometer-sized droplets, whereas for large concentrations, it is fast and bush-like microstructures are observed. These microstructures increase in size and progressively invade the complete water/PO interfaces, detach, and finally migrate into the PO phase. This transport phenomenon withdraws water from the drops and leads to a gradual shrinking of their volume. At the end of this process, they appear as deformed objects surrounded by a loose membrane.
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