We report our discovery of volume self-oscillation in a microcapsule system. The oscillation was first achieved using smart membrane system that is inspired by cellular calcium oscillations observed in biological oscillating system, such as a circadian clock or a molecular mechanism that determines nerve impulse firing or that governs the cell cycle. The oscillation in our system consists of volume expansion and shrinking driven by osmotic pressure differences across the membrane of microcapsule. Because oscillations can be often observed in bistable system with delayed feedback, such as predator-prey cycles, we used a permselective membrane which is highly sensitive to the pH environment in order to build such a feedback into our microcapsule system.

Self-oscillation observed in pH sensitive microcapsules and its release behavior

246th National Meeting (2013)

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