Magnet levitation at your fingertips

Geim, A. K.; Simon, M.; Boamfa, Marius I.; Heflinger, L. O.

doi:10.1038/22444

Cited by 140 publications

(82 citation statements)

References 7 publications

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“…This technique has been used to present levitating dishes of a couple of centimetres (e.g., Anthony Martin at Morimoto -New York [33]). Diamagnetic levitation uses repulsion from magnets [16], but the effect is weaker and the materials are still limited.…”

Section: Acoustic Levitationmentioning

confidence: 99%

TastyFloats

Thanh

Marzo

Ablart

et al. 2017

Proceedings of the 2017 ACM International Conference on Interactive Surfaces and Spaces

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We present two realizations of TastyFloats, a novel system that uses acoustic levitation to deliver food morsels to the users' tongue. To explore TastyFloats' associated design framework, we first address the technical challenges to successfully levitate and deliver different types of foods on the tongue. We then conduct a user study, assessing the effect of acoustic levitation on users' taste perception, comparing three basic taste stimuli (i.e., sweet, bitter and umami) and three volume sizes of droplets (5µL, 10µL and 20µL). Our results show that users perceive sweet and umami easily, even in minimal quantities, whereas bitter is the least detectable taste, despite its typical association with an unpleasant taste experience. Our results are a first step towards the creation of new culinary experiences and innovative gustatory interfaces.

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Section: Acoustic Levitationmentioning

confidence: 99%

TastyFloats

Thanh

Marzo

Ablart

et al. 2017

Proceedings of the 2017 ACM International Conference on Interactive Surfaces and Spaces

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“…Here, we will show that magnetic forces can be used to simulate variable gravity environments for paramecia. This work builds on previous studies using magnetic levitation (14)(15)(16) to simulate zero gravity for protein crystallization (17,18) and fluid dynamics experiments (19) and magnetic forces to alter gravitropism in plants (20). In an earlier report (21), a magnetic force buoyancy variation technique (MFBV) was introduced to vary the apparent weight of immobile cells with magnetic forces.…”

mentioning

confidence: 99%

Swimming Paramecium in magnetically simulated enhanced, reduced, and inverted gravity environments

Guevorkian

Valles

2006

Proc. Natl. Acad. Sci. U.S.A.

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Earth's gravity exerts relatively weak forces in the range of 10 -100 pN directly on cells in biological systems. Nevertheless, it biases the orientation of swimming unicellular organisms, alters bone cell differentiation, and modifies gene expression in renal cells. A number of methods of simulating different strength gravity environments, such as centrifugation, have been applied for researching the underlying mechanisms. Here, we demonstrate a magnetic force-based technique that is unique in its capability to enhance, reduce, and even invert the effective buoyancy of cells and thus simulate hypergravity, hypogravity, and inverted gravity environments. We apply it to Paramecium caudatum, a single-cell protozoan that varies its swimming propulsion depending on its orientation with respect to gravity, g. In these simulated gravities, denoted by f gm, Paramecium exhibits a linear response up to fgm ‫؍‬ 5 g, modifying its swimming as it would in the hypergravity of a centrifuge. Moreover, experiments from f gm ‫؍‬ 0 to ؊5 g show that the response is symmetric, implying that the regulation of the swimming speed is primarily related to the buoyancy of the cell. The response becomes nonlinear for f gm >5 g. At fgm ‫؍‬ 10 g, many paramecia ''stall'' (i.e., swim in place against the force), exerting a maximum propulsion force estimated to be 0.7 nN. These findings establish a general technique for applying continuously variable forces to cells or cell populations suitable for exploring their force transduction mechanisms.buoyancy ͉ force ͉ gravikinesis ͉ levitation ͉ microorganism

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“…Many semiconductor materials including carbon nanotubes are diamagnetic [11,12]. Such material will be attracted to a region with minimum magnetic field as has been demonstrated in various magnetic levitation systems [13][14][15][16][17]. Thus in principle, it should be possible to design certain magnetic configuration that can trap cylindrical diamagnetic objects.…”

mentioning

confidence: 99%

A parallel dipole line system

Gunawan¹,

Virgus

Tai

2015

Applied Physics Letters

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The ability to trap matter is of great importance in experimental physics since it allows isolation and measurement of intrinsic properties of the trapped matter. We present a study of a three dimensional (3D) trap for a diamagnetic rod in a pair of diametric cylindrical magnets. This system yields a fascinating 1D camelback potential along the longitudinal axis which is one of the elementary model potentials of interest in physics. This potential can be tailored by controlling the magnet length/radius aspect ratio. We develop theoretical models and verify them with experiments using graphite rods. We show that, in general, a camelback field or potential profile exists in between a pair of parallel linear dipole distribution. By exploiting this potential, we demonstrate a unique and simple technique to determine the magnetic susceptibility of the rod. This system could be further utilized as a platform for custom-designed 1D potential, a highly sensitive force-distance transducer or a trap for semiconductor nanowires.Various matter and particle traps using optical or electromagnetic systems have been developed and instrumental in investigation of many physical phenomena [1][2][3]. Most macroscale matter trap systems work for spherical or arbitrary shape objects [2] but almost none has been specifically developed for cylindrical objects. This work is initially motivated by the challenge to solve the problem of future electronic integrated circuit fabrication at the end of transistor scaling limit, specifically for semiconductor nanowire (or carbon nanotube) based integrated circuit [4][5][6]. Such nanowire electronic circuit can be fabricated by top-down approach using conventional e-beam lithography [7,8], however this method is expensive and has low throughput. An alternative technique is "bottom-up" approach where the nanowires are grown, such as using vapor-liquid-solid technique [9] and then harvested in massive quantities [10]. Unfortunately there remains a key problem of how to assemble these nanowires precisely to targeted locations for integrated circuit fabrication. One possible route is to seek a scalable system that could trap cylindrical objects such as these nanowires. Many semiconductor materials including carbon nanotubes are diamagnetic [11,12]. Such material will be attracted to a region with minimum magnetic field as has been demonstrated in various magnetic levitation systems [13][14][15][16][17]. Thus in principle, it should be possible to design certain magnetic configuration that can trap cylindrical diamagnetic objects.In this report, we study a 3D confinement produced by a pair of cylindrical diametric magnets i.e. magnet with magnetization along the diameter. We discovered that a 1D camelback potential naturally arises along the longitudinal direction of the magnet. This potential is one of the elementary model potentials of special interest in physics as it represents a simple confinement potential with two barriers. It is also reminiscent of a double rectangular barrier potential syste...

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Magnet levitation at your fingertips

Cited by 140 publications

References 7 publications

TastyFloats

TastyFloats

Swimming Paramecium in magnetically simulated enhanced, reduced, and inverted gravity environments

A parallel dipole line system

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