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The only intrinsic property of the elastic tail that governs the form and rate of wave propagation along its length is the bending stiffness. Such traveling wave motion is performed by spermatozoa, which possess a tail that is characterized by intrinsic variable stiffness along its length. In this paper, the passive bending stiffness of the magnetic nanoparticle\u2010coated flagella of bull sperm cells is measured using a contactless electromagnetic\u2010based excitation method. Numerical elasto\u2010hydrodynamic models are first developed to predict the magnetic excitation and relaxation of nanoparticle\u2010coated nonuniform flagella. Then solutions are provided for various groups of nonuniform flagella with disparate nanoparticle coatings that relate their bending stiffness to their decay rate after the magnetic field is removed and the flagellum restores its original configuration. The numerical models are verified experimentally, and capture the effect of the nanoparticle coating on the bending stiffness. It is also shown that electrostatic self\u2010assembly enables arbitrarily magnetizable cellular segments with variable stiffness along the flagellum. The bending stiffness is found to depend on the number and location of the magnetized cellular\u00a0segments.<\/jats:p>","DOI":"10.1002\/adts.202100438","type":"journal-article","created":{"date-parts":[[2022,1,27]],"date-time":"2022-01-27T03:11:35Z","timestamp":1643253095000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Modeling and Characterization of the Passive Bending Stiffness of Nanoparticle\u2010Coated Sperm Cells using Magnetic Excitation"],"prefix":"10.1002","volume":"5","author":[{"given":"Jo\u00e3o M. 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