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

Llorente Garcia, I; Nguyen, J; Contera, S; (2016) Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution. RSC Advances , 52 (6) pp. 46643-46653. 10.1039/C6RA07657B. Green open access

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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.

Type: Article
Title: Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/C6RA07657B
Publisher version: http://dx.doi.org/10.1039/C6RA07657B
Language: English
Additional information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1482083
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