Microfluidic Pumping Utilizing a PDMS Membrane With an Integrated Nonuniform Open-Porous Foam

Hilber, Wolfgang; Clara, Stefan; Jakoby, Bernhard

doi:10.1109/jsen.2015.2438431

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…The open-porous foam membrane is used in order to simultaneously assure filtration and pumping. This approach can be used in microfiltration being less sensitive to the fouling due to the intrinsic vibration of the membrane [ 102 ].…”

Section: Design and Fabrication Of The Microfluidic Systemsmentioning

confidence: 99%

Microelectromechanical Systems Based on Magnetic Polymer Films

et al. 2022

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Microelectromechanical systems (MEMS) have been increasingly used worldwide in a wide range of applications, including high tech, energy, medicine or environmental applications. Magnetic polymer composite films have been used extensively in the development of the micropumps and valves, which are critical components of the microelectromechanical systems. Based on the literature survey, several polymers and magnetic micro and nanopowders can be identified and, depending on their nature, ratio, processing route and the design of the device, their performances can be tuned from simple valves and pumps to biomimetic devices, such as, for instance, hearth ventricles. In many such devices, polymer magnetic films are used, the disposal of the magnetic component being either embedded into the polymer or coated on the polymer. One or more actuation zones can be used and the flow rate can be mono-directional or bi-directional depending on the design. In this paper, we review the main advances in the development of these magnetic polymer films and derived MEMS: microvalve, micropump, micromixer, microsensor, drug delivery micro-systems, magnetic labeling and separation microsystems, etc. It is important to mention that these MEMS are continuously improving from the point of view of performances, energy consumption and actuation mechanism and a clear tendency in developing personalized treatment. Due to the improved energy efficiency of special materials, wearable devices are developed and be suitable for medical applications.

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Section: Design and Fabrication Of The Microfluidic Systemsmentioning

confidence: 99%

Microelectromechanical Systems Based on Magnetic Polymer Films

et al. 2022

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“…Although no application in microfluidics has so far been reported, it has been used for sensing and energy harvesting [86], and the material may also be suitable for actuators. An open-pored PDMS foam with a gradient in pore size has been used for simultaneous filtration and pumping of fluids [87]. This foam together with a small ring magnet for actuation was integrated into a membrane.…”

Section: Microstructures Based On Pdmsmentioning

confidence: 99%

“…Since Beebe et al introduced PH structures for autonomous flow control inside microfluidic structures in 2000 [101], their publication has been cited over 1000 times, and hydrogel-based actuator schemes are among the most widely published basic approaches. Several review papers address hydrogel-based actuators in the context of (1) general issues concerning possibilities and limitations [102], (2) their mechanical deformation behavior [103], and (3) their application in From [87], Ó2015 IEEE. Reproduced with permission Fig.…”

Section: Polymer Hydrogelsmentioning

confidence: 99%

Stimulus-active polymer actuators for next-generation microfluidic devices

Hilber

2016

Appl. Phys. A

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Microfluidic devices have not yet evolved into commercial off-the-shelf products. Although highly integrated microfluidic structures, also known as lab-on-a-chip (LOC) and micrototal-analysis-system (lTAS) devices, have consistently been predicted to revolutionize biomedical assays and chemical synthesis, they have not entered the market as expected. Studies have identified a lack of standardization and integration as the main obstacles to commercial breakthrough. Soft microfluidics, the utilization of a broad spectrum of soft materials (i.e., polymers) for realization of microfluidic components, will make a significant contribution to the proclaimed growth of the LOC market. Recent advances in polymer science developing novel stimulus-active soft-matter materials may further increase the popularity and spreading of soft microfluidics. Stimulus-active polymers and composite materials change shape or exert mechanical force on surrounding fluids in response to electric, magnetic, light, thermal, or water/solvent stimuli. Specifically devised actuators based on these materials may have the potential to facilitate integration significantly and hence increase the operational advantage for the end-user while retaining costeffectiveness and ease of fabrication. This review gives an overview of available actuation concepts that are based on functional polymers and points out promising concepts and trends that may have the potential to promote the commercial success of microfluidics.

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“…References [1]- [4] For valve-less piezoelectric pump, it is composed of PZT diaphragm and flow jet part. Between the two main components, there are many factors in output performance including channel shapes [4]- [7], chamber configuration [8], [9], structure parameters [10]- [12] and flow channel distribution [13]- [15], etc. Those above are intertwined with the flow rectify ability directly or indirectly.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Verification on Characteristics of Valve-Less Piezoelectric Pump Effected by Valve Hole Spacing

Chen

Xie

et al. 2019

IEEE Access

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Valve-less piezoelectric pumps possess the advantages of simple structure and absence of electromagnetic interference, which has accordingly drawn widespread attention. In this paper, in order to improve the performance of valve-less piezoelectric pumps, various kinds of the prototypes had been designed and fabricated to discover the relationship between the performance and the structural parameters of valve hole spacing. The prototype is comprised of a piezoelectric actuator and a pump chamber through a conical tube that connects the pump chamber with the buffer chamber. First, the flow characteristics of the valve-less pump were performed by using COMSOL Multiphysics. According to the simulation result, the decline of flow velocity around the valve holes on the side far from the center of the pump chamber may be the reasons for the performance degradation. Second, the effect of valve hole spacing on the prototype was investigated with respect to several parameters, such as the chamber height and cone angle. The experimental results indicated that the valve-less piezoelectric pump output flowrate can be improved by reducing spacing valve hole spacing. A maximum flowrate of 8.43mL/min was achieved at valve hole spacing of 3 mm, which is 13.6% and 47.1% higher than that at 15 mm and 25 mm, respectively. We finally verify the feasibility of improving the capacity of valve-less piezoelectric pumps by reducing valve hole spacing. INDEX TERMS Valve hole spacing, valve-less piezoelectric pump, output flowrate.

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Microfluidic Pumping Utilizing a PDMS Membrane With an Integrated Nonuniform Open-Porous Foam

Cited by 6 publications

References 12 publications

Microelectromechanical Systems Based on Magnetic Polymer Films

Microelectromechanical Systems Based on Magnetic Polymer Films

Stimulus-active polymer actuators for next-generation microfluidic devices

Design and Experimental Verification on Characteristics of Valve-Less Piezoelectric Pump Effected by Valve Hole Spacing

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