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Title: Dynamic Oscillation and Motion of Oil‐in‐Water Emulsion Droplets

Journal Article · · Angewandte Chemie
ORCiD logo [1];  [2];  [1];  [2];  [3]; ORCiD logo [4]
  1. Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
  2. Department of Chemical Engineering The Pennsylvania State University University Park PA 16802 USA
  3. Department of Chemistry The Pennsylvania State University University Park PA 16802 USA, Department of Material Science and Engineering The Pennsylvania State University University Park PA 16802 USA
  4. Department of Chemistry The Pennsylvania State University University Park PA 16802 USA, Department of Chemical Engineering The Pennsylvania State University University Park PA 16802 USA

Abstract The interplay of interfacial tensions on droplets results in a range of self‐powered motions that mimic those of living systems and serve as a tunable model to understand their complex non‐equilibrium behavior. Spontaneous shape deformations and oscillations are crucial features observed in nature but difficult to incorporate in synthetic artificial systems. Here, we report sessile oil‐in‐water emulsions that exhibit rapid oscillating behavior. The oscillations depend on the nature and concentration of the surfactant, the chemical composition of the oil, and the wettability of the solid substrate. The rapid changes in the contact angle per oscillation are observed using side‐view optical microscopy. We propose that the changes in the interfacial tension of the oil droplets is due to the partitioning of the surfactant into the oil phase and the movement of self‐emulsified oil out of the parent droplets giving rise to the rhythmic variation in droplet contact‐line. The ability to control and understand droplet oscillation can help model similar oscillations in out‐of‐equilibrium systems in nature and reproduce biomimetic behavior in artificial systems for various applications, such as microfluidic lab‐on‐a‐chip and adaptive materials.

Sponsoring Organization:
USDOE
OSTI ID:
2217684
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 136 Journal Issue: 6; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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