If imitation is the most sincere form of flattery, then Eugenia Kumacheva is paying respect to a true master. A professor of chemistry at the University of Toronto, her laboratory develops soft materials to mimic biological responses found in nature. In particular, she is interested in materials that can be programmed to change their shape or size in response to triggers such as light or temperature. These shape-shifting materials that adapt to save energy and space have diverse applications, ranging from biomedicine to data storage.
One of Kumacheva’s goals is to make optical data storage more compact, which she has applied to biometric identification for security purposes. She is also developing smart materials to cut off the blood supply to tumours by taking advantage of their unusually high acidity: her materials expand to block blood capillaries in response to the acidic tumour environment.
With a muse as vast as the natural world, shape-shifting inspiration can be found anywhere. Kumacheva says, “I’ve just returned from Costa Rica, and we were in the rainforest, and all of a sudden I saw this amazing plant: it folds up and then opens up, depending on time of the day, and I thought that it would be good to make such a material because it can serve many applications. For example, saving energy and space: make it fold and unfold depending on the particular state.”