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About

Hiroaki Sai is a leading researcher in soft matter robotics and supramolecular polymer chemistry, whose work bridges the gap between synthetic materials and biological functions. His most impactful contribution is the development of hydrogel-metal hybrids capable of fast, programmable locomotion under light and magnetic fields—a breakthrough published in 2020 that has garnered 282 citations. This work demonstrates how internal fuels or external energy inputs can drive shape transformations and movement in soft materials, with potential applications ranging from robotics to smart chemical management. Sai has also made significant strides in supramolecular and hybrid bonding polymers, exploring how supramolecular components enhance the actuation speed of spiropyran hydrogels. His 2023 study on photo-actuation, with 21 citations, reveals that supramolecular polymers can dramatically accelerate reversible bending and locomotion in response to light. By integrating covalent and non-covalent interactions, Sai’s research offers a new paradigm for designing lifelike, responsive materials. His work not only advances fundamental polymer science but also paves the way for next-generation soft robots and adaptive devices that mimic the dynamic behaviors of living organisms.