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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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Supplementary files

Article information


Submitted
23 Mar 2016
Accepted
15 Apr 2016
First published
20 Apr 2016

This article is Open Access

RSC Adv., 2016,6, 46643-46653
Article type
Paper
Author version available

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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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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