We measure the bending deformation of SMA/PEI polymer multilayered nanotubes induced by a transverse hydrodynamic flow past optically trapped nanotube-micro-sphere assemblies in overhanging and end-supported beam configurations. Theoretical analysis of the deformation furnishes the bending stiffness and elastic modulus, the latter of which we compare to values from dry “nanopaper” sheets and other polymer multilayer systems reported in the literature. The results suggest that covalent cross-linking between the SMA and PEI layers produces stiff, water-stable laminates, whereas neither component forms a stable solid in water on its own. The proof of principle for optical-tweezers micromechanics demonstrated here furnishes a persistence length EI/(kBT)


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