Microcapsules are solid matrix or liquid globules containing valuable compounds covered by a protective shell membrane that allows controlled release of the enclosed material. The best example of a natural microcapsule is a red blood cell. It is essential to understand the deformation of capsules in the nonlinear regimes to estimate their yield stress, ultimate stress, and membrane characteristics, such as hardening or softening, that are typically observed in the nonlinear regime.

This research work is to incorporate the electrohydrodynamic technique for computing various interfacial rheological properties of the microcapsules using the creep and oscillatory tests. It is challenging to study the interfacial rheology of microcapsule membranes at high frequencies as most commercially available rheometers work in the frequency range between 0.01 Hz to 200 Hz. We demonstrate the application of the electrodeformation technique to study the interfacial rheological properties of capsules in the high-frequency range. The microstructure-rheology relationship for polysiloxane and human serum albumin microcapsules is studied. The work establishes an equivalence between a simple "whole-cell" like spring-dashpot element-based model with the complete viscoelastoelectrohydrodynamic model.