caa a22 4500 605480303 CHVBK 20210128100414.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s10544-015-9948-7 doi (NATIONALLICENCE)springer-10.1007/s10544-015-9948-7 A microfluidic device based on an evaporation-driven micropump [Elektronische Daten] [Chuan Nie, Arjan Frijns, Rajesh Mandamparambil, Jaap den Toonder] In this paper we introduce a microfluidic device ultimately to be applied as a wearable sweat sensor. We show proof-of-principle of the microfluidic functions of the device, namely fluid collection and continuous fluid flow pumping. A filter-paper based layer, that eventually will form the interface between the device and the skin, is used to collect the fluid (e.g., sweat) and enter this into the microfluidic device. A controllable evaporation driven pump is used to drive a continuous fluid flow through a microfluidic channel and over a sensing area. The key element of the pump is a micro-porous membrane mounted at the channel outlet, such that a pore array with a regular hexagonal arrangement is realized through which the fluid evaporates, which drives the flow within the channel. The system is completely fabricated on flexible polyethylene terephthalate (PET) foils, which can be the backbone material for flexible electronics applications, such that it is compatible with volume production approaches like Roll-to-Roll technology. The evaporation rate can be controlled by varying the outlet geometry and the temperature. The generated flows are analyzed experimentally using Particle Tracking Velocimetry (PTV). Typical results show that with 1 to 61 pores (diameter = 250μm, pitch = 500μm) flow rates of 7.3 × 10-3 to 1.2 × 10-1μL/min are achieved. When the surface temperature is increased by 9.4°C, the flow rate is increased by 130%. The results are theoretically analyzed using an evaporation model that includes an evaporation correction factor. The theoretical and experimental results are in good agreement. The Author(s), 2015 Evaporation nationallicence Flexible system nationallicence Flow rate control nationallicence Micropump nationallicence Nie Chuan Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut Frijns Arjan Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut Mandamparambil Rajesh Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut den Toonder Jaap Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut Biomedical Microdevices Springer US; http://www.springer-ny.com 17/2(2015-04-01), 1-12 1387-2176 17:2<1 2015 17 10544 https://doi.org/10.1007/s10544-015-9948-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10544-015-9948-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nie Chuan Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut NATIONALLICENCE 700 1- Frijns Arjan Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut NATIONALLICENCE 700 1- Mandamparambil Rajesh Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut NATIONALLICENCE 700 1- den Toonder Jaap Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands aut NATIONALLICENCE 773 0- Biomedical Microdevices Springer US; http://www.springer-ny.com 17/2(2015-04-01), 1-12 1387-2176 17:2<1 2015 17 10544