涂脂石墨微粒在溶液中的磁电取向
Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution
摘要：
我们证明，第一次，限制微米级石墨片的取向到一个明确的平面。我们在水溶液中使用均匀磁场和AC电场的组合并利用HOPG的各向异性抗磁性和电学性质来定向和旋转捕获脂质涂覆的高度有序热解石墨（HOPG）微片。通过测量旋转陷阱中单个取向粒子的旋转布朗涨落，我们定量地确定了微片的旋转陷阱刚度、最大施加转矩和极化各向异性，以及它们对电场频率的依赖关系。此外，我们量化的微粒与相邻的玻璃表面的各种表面处理的相互作用。我们概述了这项工作的各种应用，包括生物系统中的扭矩传感。
英文摘要：
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.
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