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• W4206375058 abstract "Electrocoalescence is a powerful technique for manipulating water-hydrocarbon media. This study is a detailed experimental investigation of the influence of surfactant on electrowetting-induced surface electrocoalescence of micron-scale water droplets in hexadecane. Surface electrocoalescence is studied over a vast parameter space comprising surfactant concentration, voltage, frequency and electrode geometry. We develop phase maps for various electrocoalescence possibilities and identify the parameter space for significant coalescence using three dimensionless parameters: i) modified electric capillary number (Cae*), ii) frequency (τ), and iii) surfactant concentration (C*). Electrocoalescence effectiveness is quantified using the parameter (δ/α): δ is the droplet density/area and α is the fraction of surface not covered by droplets. Strong coalescence (no surfactant) corresponds to δ/α < 10 droplets/mm2, with best-case δ/α = 1.6 droplets/mm2, with no droplets < 20 µm diameter and electrocoalesced droplets as large as 750 μm. With surfactant, electrocoalescence weakens; parameter space for strong electrocoalescence progressively reduces with concentration. Nonetheless, electrocoalescence at all concentrations results in substantial radius enhancement (after/before electrocoalescence); measured ratio ranges from 3.1 to 6.3 in the parameter space of Cae*: 3.3–4.9, and τ≤1.25*10−2. Surface electrocoalescence therefore promotes significant aggregation of water droplets over a wide range of interfacial energies. This study also characterizes droplet generation (via satellite droplet ejection (SDE)) of 2–10 µm radii droplets. SDE scales with voltage, frequency and concentration, and inversely with electrode spacing. Overall, we show that water droplets can be coalesced or generated using the same microfluidic device, and identify the parametric space to enable surface-electrocoalescence-based fluidic separation and droplet generation." @default.
• W4206375058 created "2022-01-25" @default.
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• W4206375058 date "2022-06-01" @default.
• W4206375058 modified "2023-10-16" @default.
• W4206375058 title "Influence of surfactant on electrowetting-induced surface electrocoalescence of water droplets in hydrocarbon media" @default.
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• W4206375058 doi "https://doi.org/10.1016/j.colsurfa.2022.128325" @default.
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