Ferrofluids (FFs) can adapt their shape to a magnetic field. However, they cannot maintain their shape when the magnetic field is removed. Here, with a magneto-responsive and reconfigurable interfacial self-assembly (MRRIS) process, we show that FFs can be structured by a magnetic field and maintain their shape, like solids, after removing the magnetic field. The competing self-assembly of magnetic and nonmagnetic nanoparticles at the liquid interface endow FFs with both reconfigurability and structural stability. By manipulating the external magnetic field, we show that it is possible to "write" and "erase" the shape of the FFs remotely and repeatedly. To gain an in-depth understanding of the effect of MRRIS on the structure of FFs, we systematically study the shape variation of these liquids under both the static and dynamic magnetic fields. Our study provides a simple yet novel way of manipulating FFs and opens opportunities for the fabrication of all-liquid devices.
Derek Popple, Mikhail Shekhirev, Chunhui Dai, Paul Kim, Katherine Xiaoxin Wang, Paul D. Ashby, Brett A. Helms, Yury Gogotsi, Thomas P. Russell, Alex Zettl
Jeffrey D. Cain, Amin Azizi, Kathleen Maleski, Babak Anasori, Emily C. Glazer, Paul Y. Kim, Yury Gogotsi, Brett A. Helms, Thomas P. Russell, Alex Zettl
Caique Serati de Brito, Paulo E. Faria, Talieh S. Ghiasi, Josep Ingla‐Aynés, Cesar Rabahi, Camila Cavalini, Florian Dirnberger, Samuel Mañas‐Valero, Kenji Watanabe, Takashi Taniguchi, Klaus Zollner, Jaroslav Fabian, Christian Schüller, Herre S. J. van der Zant, Y. Galvão Gobato
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