Deformation Characteristics of Soft Hyper-elastic Microgels in a Two Phases Converging Flow Microchannel
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Linear elastic assumptions for biological tissues and soft materials result in significant evaluation errors across a wide stress range. We investigate hyper-elastic properties of ultra-soft poly(N-isopropyl acrylamide) microgels (USPNMs) in a converging channel flow, representing biological tissues. Employing baby hydrogel-oil carrier fluid to transport hydrophilic USPNMs, we balance shear stress, elongational stress, elastic stress, and interfacial Laplace pressure at the flow's centerline. Microscopic images construct a non-linear stress-strain curve, effectively characterized by conventional hyper-elastic models. USPNM's elastic modulus (30 Pa) compares to animal brain tissue, promising accurate evaluations in soft materials, biology, and medicine.