Referenzen
- Vorführexperimente, Videos
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Diamagnetic Levitation with Pyrolytic Graphite - $20 How-To
A demonstration showing how arrange small neodymium magnets for the diamagnetic levitation of pyrolytic graphite
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Laser Motion Control of Levitating Graphite
Demonstration of optical motion control of levitating graphite
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Levitate a Piece of Graphite on Magnets - $10 Project
Demonstration how to float a piece of graphite on 9 cube magnets.
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Optical Motion Control of Maglev Graphite
Demonstration of optical Motion Control of Maglev Graphite - even in sunlight
- Wissenschaftliche Artikel
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Laser control of graphite plate tilting on a magnet surface
When a diamagnetic graphite plate is placed on top of a magnet, it is subject to both magnetic levitation and gravitational forces. Computational modeling is used to demonstrate that these forces can balance each other to allow a stable tilt angle to be attained when the graphite plate pivots on the magnet surface. The tilt angle depends on the magnetic susceptibility, which can be controlled by using laser irradiation to change the temperature of the graphite. Over a limited temperature range, there is a linear relation between the angle change and the temperature change. This predicted behavior is confirmed experimentally using a graphite plate placed on top of a neodymium iron boride magnet. Using a 532 nm laser, the tilt angle could be continuously tuned by varying the laser power.
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Optical control and manipulation of diamagnetically levitated pyrolytic graphite
When levitating above an alternating-pole permanent magnet array, pyrolytic graphite can be displaced by asymmetric diamagnetic forces resulting from optically-induced, localized temperature changes and the thermal dependence of pyrolytic graphite’s magnetic susceptibility. In this paper, they present methods for addressable, automated position control of levitating pyrolytic graphite samples acting as milli-robots for small-scale assembly and manipulation applications using optical actuation and machine vision techniques.
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Optical Motion Control of Maglev Graphite
They show that the magnetically levitating pyrolytic graphite can be moved in the arbitrary place by simple photoirradiation. The optical movement is driven by photothermally
induced changes in the magnetic susceptibility of the graphite. Moreover, they demonstrate that light energy can be converted into rotational kinetic energy by means of the
photothermal property. They find that the levitating graphite disk rotates at over 200 rpm under the sunlight.https://www.agofuelcells.com/wp-content/uploads/2016/01/diamagnetic-controll-system.pdf
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Optomechanical actuation of diamagnetically levitated pyrolytic graphite
Under an external magnetic field, a levitated pyrolytic graphite sample with a localized temperature change experiences unequal diamagnetic forces. In this paper, they present a study of the macroscale optomechanical displacement of a levitated pyrolytic graphite sample by using a laser source to locally increase the temperature. Dynamic finite-element method simulations show that a localized increase in the sample temperature, simulating a laser source, decreases the diamagnetic force in that local area, leading to the displacement of the pyrolytic graphite sample in the plane of the permanent magnet array.
https://www.usna.edu/MechEngDept/_files/documents/brownell_files/Ewall-Wice_TMAG_2019.pdf
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Passive Maglev: An investigation on diamagnetic levitation of graphite sheets
They investigate the resonant behaviour, equilibrium position and temperature dependence of pyrolytic and isotropic graphite sheets of various sizes levitating in an array of permanent magnets, making use of novel and accessible methods without the need for advanced equipment. Using these results, they characterize the magnetic susceptibility at room temperature experimentally as well as the change in susceptibility with different temperatures.