Premium
Cooperative Switching in Large‐Area Assemblies of Magnetic Janus Particles
Author(s) -
Hwang Sangyeul,
Nguyen Trung Dac,
Bhaskar Srijanani,
Yoon Jaewon,
Klaiber Marvin,
Lee Kyung Jin,
Glotzer Sharon C.,
Lahann Joerg
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201907865
Subject(s) - janus , materials science , nanotechnology , superparamagnetism , janus particles , magnetic nanoparticles , cloaking , particle (ecology) , magnetic particle inspection , nanoparticle , magnetization , magnetic field , optoelectronics , metamaterial , physics , oceanography , quantum mechanics , geology
Magnetic Janus particles (MJPs) have received considerable attention for their rich assembly behavior and their potential technological role in applications ranging from simple magnetophoretic displays to smart cloaking devices. However, further progress is hampered by the lack of predictive understanding of the cooperative self‐assembly behavior of MJPs and appropriate dynamic control mechanisms. In this paper, a detailed experimental and theoretical investigation into the magnetically directed spatiotemporal self‐assembly and switching of MJPs is presented. For this purpose, a novel type of MJPs with defined hemispherical compartments carrying superparamagnetic iron oxide nanoparticles as well as a novel simulation model to describe their cooperative switching behavior is established. Combination of the theoretical and experimental work culminates in a simple method to direct assemblies of MJPs, even at high particle concentrations. In addition, a magnetophoretic display with switchable MJPs is developed on the basis of the theoretical findings to demonstrate the potential usefulness of controlled large‐area assemblies of magnetic Janus particles.