Electrically Modulated Thin Film Dynamics Controlling Bubble Manipulation in Microfluidic Confinement

TL;DR

This paper uncovers a novel electro-mechanically driven thin film instability in microfluidic channels, enabling controlled bubble formation and manipulation through electric fields, with potential applications in miniaturized fluidic systems.

Contribution

It introduces a new instability mechanism governed by electro-hydrodynamics in confined thin films, advancing understanding of bubble dynamics in microfluidic environments.

Findings

Critical electric field induces ordered interfacial structures.

Bubbles undergo elongation, deformation, and breakup under electric fields.

Insights into electro-hydrodynamic control of microbubbles in confined spaces.

Abstract

Thin film dynamics and associated instability mechanisms have triggered a wide range of scientific innovations, as attributed to their abilities of creating fascinating patterns over small scales. Here, we demonstrate a new thin film instability phenomenon governed by electro-mechanics and hydrodynamics over interfacial scales in a narrow fluidic confinement. We first bring out the essential physics of this instability mechanism, in consideration with the fact that under the action of axial electrical field in a confined microfluidic environment, perturbations may be induced on the interfaces of thin corner films formed adjacent to the walls of a microchannel, leading to the inception of ordered lateral structures. A critical electric field exists beyond which these structures from the walls of the confinement intermingle to evolve into localized gas pockets in the form of bubbles. These bubbles do not remain static with further changes in electric field, but undergo a sequence of elongation-deformation-breakup episode in a dynamically evolving manner. By elucidating the complex interplay of electro-hydrodynmic forces and surface tension, we offer further insights into a new paradigm of interfacial instability mediated controlled microbubble manipulation for on-chip applications, bearing far-ranging scientific and technological consequences in executing designed fluidic operations in confined miniaturized environment.