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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Published on: September 30, 2014

A liquid/liquid interface excited by stimulation with water.

Satoshi Nakata1, Kumika Ishibashi, Kouhei Kawata

  • 1Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan. nakatas@hiroshima-u.ac.jp

Journal of Colloid and Interface Science
|January 13, 2009
PubMed
Summary

Adding a small amount of water to a calcium chloride (CaCl2) aqueous and ester interface can cause excitation, like bursting and flow. This phenomenon occurs above a critical CaCl2 concentration and depends on the specific ester used.

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Area of Science:

  • Physical Chemistry
  • Interface Science
  • Fluid Dynamics

Background:

  • Immiscible liquid-liquid interfaces are crucial in various chemical and physical processes.
  • Understanding interfacial phenomena, such as excitation and flow, is key to controlling these processes.
  • The Marangoni effect, driven by surface tension gradients, can induce fluid motion.

Purpose of the Study:

  • To investigate the excitation phenomenon at a CaCl2 aqueous-ester interface induced by water addition.
  • To determine the critical CaCl2 concentration for interface excitation.
  • To explore the influence of different ester types on the excitation characteristics.

Main Methods:

  • Creating an immiscible interface of CaCl2 aqueous and ester phases.
  • Controlled addition of small amounts of water to the interface.
  • Observation and analysis of interfacial excitation (bursting and flow).
  • Varying CaCl2 concentration and ester composition.

Main Results:

  • Interfacial excitation was observed above a critical CaCl2 concentration.
  • The critical concentration and degree of excitation were dependent on the type of ester.
  • The excitation involved bursting and flow phenomena at the interface.
  • Interfacial tension measurements and Marangoni effect analysis were performed.

Conclusions:

  • The excitation of the immiscible interface is triggered by the addition of water.
  • A critical concentration of CaCl2 in the aqueous phase is necessary for excitation.
  • The nature of the ester significantly influences the excitation process.
  • The observed phenomenon is explained by interfacial tension gradients and the Marangoni effect.