An advanced viscosity and density sensor based on diamagnetically stabilized levitation

Clara, Stefan; Antlinger, H.; Abdallah, Ali; Reichel, Erwin K.; Hilber, Wolfgang; Jakoby, Bernhard

doi:10.1016/j.sna.2016.07.021

Cited by 18 publications

(7 citation statements)

References 10 publications

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“…9b shows a MEMS metallic suspended plate resonator for viscosity sensing of complex low-viscous fluids (Reichel et al 2010(Reichel et al , 2011. Different membrane and immersed resonators, using either Lorentz force or piezo actuation, have been developed for viscosity and density measurements on low-viscous fluids (Reichel et al 2009;Clara et al 2016;Lu et al 2017;Lucklum et al 2011). Other examples include parallel plate and waveguide techniques for probing viscosities > 1 Pa•s (Abdallah et al 2016;Kazys et al 2013).…”

Section: Cantilevers and Resonating Viscometersmentioning

confidence: 99%

Bulk rheometry at high frequencies: a review of experimental approaches

et al. 2019

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High-frequency rheology is a form of mechanical spectroscopy which provides access to fast dynamics in soft materials and hence can give valuable information about the local scale microstructure. It is particularly useful for systems where timetemperature superposition cannot be used, when there is a need to extend the frequency range beyond what is possible with conventional rotational devices. This review gives an overview of different approaches to high-frequency bulk rheometry, i.e. mechanical rheometers that can operate at acoustic (20 Hz-20 kHz) or ultrasound (> 20 kHz) frequencies. As with all rheometers, precise control and know-how of the kinematic conditions are of prime importance. The inherent effects of shear wave propagation that occur in oscillatory measurements will hence be addressed first, identifying the gap and surface loading limits. Different high-frequency techniques are then classified based on their mode of operation. They are reviewed critically, contrasting ease of operation with the dynamic frequency range obtained. A comparative overview of the different types of techniques in terms of their operating window aims to provide a practical guide for selecting the right approach for a given problem. The review ends with a more forward looking discussion of selected material classes for which the use of high-frequency rheometry has proven particularly valuable or holds promise for bringing physical insights.

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Section: Cantilevers and Resonating Viscometersmentioning

confidence: 99%

Bulk rheometry at high frequencies: a review of experimental approaches

et al. 2019

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“…During the last decades, levitation of liquid droplets, 4,5 cells, 6 and solid particles 5 has been demonstrated using small permanent magnets. Moreover, this passive levitation has been used for realizing devices like accelerometers, 7,8 energy harvesters, [9][10][11] viscosity/density sensors, 12 and force sensors. 13 To realize highly sensitive resonant sensors, it is essential to characterize their frequency response and dissipation mechanisms that are closely linked to the precision with which frequencies of a resonant sensor can be determined and that are intrinsically coupled to the thermomechanical noise floor via the fluctuation dissipation theorem.…”

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confidence: 99%

Rigid body dynamics of diamagnetically levitating graphite resonators

Chen

Keşkekler

Alijani

et al. 2020

Applied Physics Letters

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“…In recent years, some applications based on diamagnetically stabilized levitation have been reported, such as sensors [ 4 , 5 , 6 ], actuators [ 7 ], and vibration energy harvesters [ 8 , 9 , 10 ]. Hilber et al [ 11 ] presented a sensor based on diamagnetically stabilized levitation, which can be used to measure the density and viscosity of fluids in microfluidic systems.…”

Section: Introductionmentioning

confidence: 99%

Levitation Characteristics Analysis of a Diamagnetically Stabilized Levitation Structure

Cheng

Wang

et al. 2021

Micromachines

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A diamagnetically stabilized levitation structure is composed of a floating magnet, diamagnetic material, and a lifting magnet. The floating magnet is freely levitated between two diamagnetic plates without any external energy input. In this paper, the levitation characteristics of a floating magnet were firstly studied through simulation. Three different levitation states were found by adjusting the gap between the two diamagnetic plates, namely symmetric monostable levitation, bistable levitation, and asymmetric monostable levitation. Then, according to experimental comparison, it was found that the stability of the symmetric monostable levitation system is better than that of the other two. Lastly, the maximum moving space that allows the symmetric monostable levitation state is investigated by Taguchi method. The key factors affecting the maximum gap were determined as the structure parameters of the floating magnet and the thickness of highly oriented pyrolytic graphite (HOPG) sheets. According to the optimal parameters, work performance was obtained by an experiment with an energy harvester based on the diamagnetic levitation structure. The effective value of voltage is 250.69 mV and the power is 86.8 μW. An LED light is successfully lit on when the output voltage is boosted with a Cockcroft–Walton cascade voltage doubler circuit. This work offers an effective method to choose appropriate parameters for a diamagnetically stabilized levitation structure.

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An advanced viscosity and density sensor based on diamagnetically stabilized levitation

Cited by 18 publications

References 10 publications

Bulk rheometry at high frequencies: a review of experimental approaches

Bulk rheometry at high frequencies: a review of experimental approaches

Rigid body dynamics of diamagnetically levitating graphite resonators

Levitation Characteristics Analysis of a Diamagnetically Stabilized Levitation Structure

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