Abstract
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.
| Original language | English (US) |
|---|---|
| Article number | 1907865 |
| Journal | Advanced Functional Materials |
| Volume | 30 |
| Issue number | 26 |
| DOIs | |
| State | Published - Jun 1 2020 |
Funding
S.H. and T.D.N. contributed equally to this work. This material was based upon work supported by, or in part by, the U. S. Army Research Office under a MURI Grant Award No. W911NF‐10‐1‐0518. T.D.N. acknowledges prior support of the Vietnam Education Foundation. The authors further acknowledge insightful discussions with Howard Bernstein and Don Chickering, Seventh Sense Biosystems Inc., that helped shape the initial idea as well as the experimental design of the work reported in this manuscript. S.H. and T.D.N. contributed equally to this work. This material was based upon work supported by, or in part by, the U. S. Army Research Office under a MURI Grant Award No. W911NF-10-1-0518. T.D.N. acknowledges prior support of the Vietnam Education Foundation. The authors further acknowledge insightful discussions with Howard Bernstein and Don Chickering, Seventh Sense Biosystems Inc., that helped shape the initial idea as well as the experimental design of the work reported in this manuscript.
Keywords
- Janus particles
- bicompartmental
- magnetic actuation
- self-assembly
- stimuli-responsive materials
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- General Chemistry
- General Materials Science
- Electrochemistry
- Biomaterials