Univ Paris, CNRS, Matiere & Syst Complexes, F-75013 Paris - France
 Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas - Brazil
 Specif Polymers, ZAC Via Domitia, F-34160 Castries - France
Total Affiliations: 3
Journal of Physical Chemistry C;
NOV 25 2020.
Web of Science Citations:
Bio-inspired materials are commonly used in the development of functional devices. The fabrication of artificial cilia mimicking the biological functions has emerged as a promising strategy for fluid manipulation in miniaturized systems. In this study, we propose a different physicochemical insight for the preparation of magnetic cilia based on the temperature-triggered reversible assembly of coated iron oxide nanoparticles in a bio-compatible template-free approach. The length of the prepared cilia could be tuned between 10 and 100 mu m reaching aspect ratios up to 100 in a very dense array of flexible structures with persistence lengths around 8 mu m. Magnetic actuation of the cilia revealed robust structures (over several hours of actuation) with a wide range of bending amplitudes resulting from high susceptibility of the filaments. The results demonstrate that the proposed strategy is an efficient and versatile alternative for templated fabrication methods and producing cilia with remarkable characteristics and dimensions within the template-free approaches. (AU)