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Issue 52, 2016
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Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution

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Abstract

We demonstrate, for the first time, confinement of the orientation of micron-sized graphitic flakes to a well-defined plane. We orient and rotationally trap lipid-coated highly ordered pyrolytic graphite (HOPG) micro-flakes in aqueous solution using a combination of uniform magnetic and AC electric fields and exploiting the anisotropic diamagnetic and electrical properties of HOPG. Measuring the rotational Brownian fluctuations of individual oriented particles in rotational traps, we quantitatively determine the rotational trap stiffness, maximum applied torque and polarization anisotropy of the micro-flakes, as well as their dependency on the electric field frequency. Additionally, we quantify interactions of the micro-particles with adjacent glass surfaces with various surface treatments. We outline the various applications of this work, including torque sensing in biological systems.

Graphical abstract: Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution

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Publication details

The article was received on 23 Mar 2016, accepted on 15 Apr 2016 and first published on 20 Apr 2016


Article type: Paper
DOI: 10.1039/C6RA07657B
Citation: RSC Adv., 2016,6, 46643-46653
  • Open access: Creative Commons BY license
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    Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution

    J. Nguyen, S. Contera and I. Llorente García, RSC Adv., 2016, 6, 46643
    DOI: 10.1039/C6RA07657B

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