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External Field Response and Applications of Metal Coated Hemispherical Janus Particles

Department of Physics, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
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Appl. Sci. 2018, 8(4), 653; https://doi.org/10.3390/app8040653
Received: 30 January 2018 / Revised: 16 April 2018 / Accepted: 16 April 2018 / Published: 23 April 2018
(This article belongs to the Section Optics and Lasers)
Hemispherical Janus particles that were coated with silver or nickel on the equatorial plane of hemispherical polymer microparticles were prepared and dispersed in water and the responses to AC electric and stationary magnetic fields applied were investigated. Both of the particles are so oriented that the equatorial plane is parallel to the AC electric field, owing to electric-field induced dipole orientation, which is the response proportional to the quadratic electric field. The nickel coated particles are self-assembled to make a chain-like structure aligned in the direction of the stationary magnetic field. In addition, when both AC electric and stationary magnetic fields are applied, the orientation of a nickel-coated hemispherical particle is uniquely determined in such a way that the equatorial plane is parallel to both electric and magnetic fields. Because the particle is magnetized on the plane, its direction is reversed when the magnetic field is reversed, which is the response that is proportional to the magnetic field. Utilizing these features, mirrors are fabricated that can switch the transmittance and reflectance with electric and magnetic fields. Such features of the Janus particles as to be controlled by an electric and magnetic fields will find wide applications in the fields of microoptics and microfluidics. View Full-Text
Keywords: Janus particle; microparticle; hetero-shaped particle; heteromorphic particle; silver; nickel; micromirror; electric field; magnetic field; self-organization Janus particle; microparticle; hetero-shaped particle; heteromorphic particle; silver; nickel; micromirror; electric field; magnetic field; self-organization
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MDPI and ACS Style

Aizawa, S.; Seto, K.; Tokunaga, E. External Field Response and Applications of Metal Coated Hemispherical Janus Particles. Appl. Sci. 2018, 8, 653. https://doi.org/10.3390/app8040653

AMA Style

Aizawa S, Seto K, Tokunaga E. External Field Response and Applications of Metal Coated Hemispherical Janus Particles. Applied Sciences. 2018; 8(4):653. https://doi.org/10.3390/app8040653

Chicago/Turabian Style

Aizawa, So; Seto, Keisuke; Tokunaga, Eiji. 2018. "External Field Response and Applications of Metal Coated Hemispherical Janus Particles" Appl. Sci. 8, no. 4: 653. https://doi.org/10.3390/app8040653

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