A high current density DC magnetohydrodynamic (MHD) micropump

Homsy, Alexandra; Koster, Sander; Eijkel, Jan C.T.; Berg, Albert van den; Lucklum, Frieder; Verpoorte, Elisabeth; Rooij, N. F. de

doi:10.1039/b417892k

Cited by 122 publications

(100 citation statements)

References 17 publications

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“…We measured the flow velocity with the same bead technique as described in Ref. [15]. Briefly, the linear flow velocity was determined by measuring the time required for beads to travel between two defined points in the pumping channel.…”

Section: Flow Measurement Methodsmentioning

confidence: 99%

“…[15]. Briefly, two micromachined frit-like structures connect the pumping channel to adjacent side reservoirs.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…At this point, the system begins to heat up, and the increase in temperature changes the physical behavior of the pumped fluid [19]. For each of these thresholds, we also calculated the corresponding power dissipation Q diss [15]:…”

Section: Joule Heating and Power Consumptionmentioning

confidence: 99%

“…[15]. The first set of wafers includes the microchannel, and the second the holes for fluidic access to the side reservoirs.…”

Section: Micropump Fabricationmentioning

confidence: 99%

“…With the help of an MHD pump that solves the bubble generation problem [15], we show in this paper MHD pumping for fluid delivery of high ionic strength solutions in a NMR magnet. In the bulky NMR magnet, we had to develop an alternative technique to allow accurate measurement of MHD flow rate.…”

Section: Introductionmentioning

confidence: 99%

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Magnetohydrodynamic pumping in nuclear magnetic resonance environments

Homsy

Linder

Lucklum

et al. 2007

Sensors and Actuators B: Chemical

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We present a DC magnetohydrodynamic (MHD) pump as component of a nuclear magnetic resonance (NMR) microfluidic chip. This is the first time that MHD pumping in an NMR environment was observed and demonstrated. This chip generates a maximum flow rate of 1.5 L min −1 (2.8 mm s −1 in the microchannel) for an applied voltage of 19 V with only 38 mW of power consumption in a 7 T superconductive magnet. We developed a simple method of flow rate measurement inside the bulky NMR magnet by monitoring the displacement of a liquid-liquid interface of two immiscible liquids in an off-chip capillary. We compared and validated this flow measurement technique with another established technique for microfluidics based on the displacement of microbeads. This allowed us to characterize and compare the flow rate generated by the micropump on top of a permanent magnet (B 1 = 0.33 T) with the superconductive magnet (B 0 = 7.05 T). We observed a 21-fold increase in flow rate corresponding to the ratio of the magnetic field intensities (B 0 /B 1 = 21) in accordance with the theoretical flow dependence on the magnetic field intensity. The final aim is to integrate MHD pumps together with planar coils in a microfluidic system for NMR analysis. The high performance of MHD pumps at relatively low flow rates is seen as an asset for NMR and MRI applications.

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Section: Flow Measurement Methodsmentioning

confidence: 99%

“…[15]. Briefly, two micromachined frit-like structures connect the pumping channel to adjacent side reservoirs.…”

Section: Experimental Methodsmentioning

confidence: 99%

Section: Joule Heating and Power Consumptionmentioning

confidence: 99%

“…[15]. The first set of wafers includes the microchannel, and the second the holes for fluidic access to the side reservoirs.…”

Section: Micropump Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetohydrodynamic pumping in nuclear magnetic resonance environments

Homsy

Linder

Lucklum

et al. 2007

Sensors and Actuators B: Chemical

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The Magnetohydrodynamic Effect and Its Associated Material Designs for Biomedical Applications: A State‐of‐the‐Art Review

Gregory

Cheng

Tang

et al. 2016

Adv Funct Materials

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The presented article discusses recent advances in biomedical applications of classical Magnetohydrodynamics (MHD), with a focus on operating principles and associated material considerations. These applications address novel approaches to common biomedical problems from micro-particle sorting for lab-on-a-chip devices to advanced physiological monitoring techniques. 100 papers in the field of MHDs were reviewed with a focus on studies with direct biomedical applications. The body of literature was categorized into three primary areas of research including Material Considerations for MHD Applications, MHD Actuation Devices, and MHD Sensing Techniques. The state of the art in the field was examined and research topics were connected to provide a wide view of the field of biomedical MHDs. As this field develops, the need for advanced simulation and material design will continue to increase in importance in order to further expand its reach to maturity. As the field of biomedical MHDs continues to grow, advances towards micro-scale transitions will continue to be made, maintaining its clinically driven nature and moving towards real-world applications.

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Laser‐Induced Graphene: From Discovery to Translation

2018

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direct laser scribing with a commercial CO 2 infrared laser system as found in most machine shops, the product being termed laser-induced graphene (LIG). [15] LIG exhibits high surface area (≈340 m 2 g −1 ), high thermal stability (>900 °C), and excellent conductivity (5-25 S cm −1 ). [15] The entire process can be performed in ambient air without any solvents, thereby making it exceedingly attractive for industrial use. This protocol combines the 3D graphene synthesis with writing into a single step process that has stimulated research ranging from fundamental studies on the transformation process to the development of a large variety of engineering applications. [15][16][17][18][19][20][21][22] Here, starting from the discovery of LIG, we will first emphasize strategies for the engineering of chemical, physical, and electronic properties of LIG; specifically, the regulation of laser parameters, atmosphere, and substrates to control the porosity, composition, and morphology of the LIG. The controllable synthesis of LIG and ease in property engineering makes it a versatile material in various applications including in sustainable energy conversions such as water splitting and fuel cell technology, [20,23] supercapacitors (SCs) for energy storage, [15,16,[24][25][26] sensors for sound, photon, strain, and chemicals detection, [27][28][29][30][31][32][33] and microfluidics [34][35][36] that are applicable to the laboratory and industrial scales, as outlined. Finally, the future advancement, such as the development of flexible electronics and biodegradable devices, will be discussed.Laser-induced graphene (LIG) is a 3D porous material prepared by direct laser writing with a CO 2 laser on carbon materials in ambient atmosphere. This technique combines 3D graphene preparation and patterning into a single step without the need for wet chemical steps. Since its discovery in 2014, LIG has attracted broad research interest, with several papers being published per month using this approach. These serve to delineate the mechanism of the LIG-forming process and to showcase the translation into many application areas. Herein, the strategies that have been developed to synthesize LIG are summarized, including the control of LIG properties such as porosity, composition, and surface characteristics, and the advancement in methodology to convert diverse carbon precursors into LIG. Taking advantage of the LIG properties, the applications of LIG in broad fields, such as microfluidics, sensors, and electrocatalysts, are highlighted. Finally, future development in biodegradable and biocompatible materials is briefly discussed. Laser-Induced Graphene

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A high current density DC magnetohydrodynamic (MHD) micropump

Cited by 122 publications

References 17 publications

Magnetohydrodynamic pumping in nuclear magnetic resonance environments

Magnetohydrodynamic pumping in nuclear magnetic resonance environments

The Magnetohydrodynamic Effect and Its Associated Material Designs for Biomedical Applications: A State‐of‐the‐Art Review

Laser‐Induced Graphene: From Discovery to Translation

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