Evaluation of Hydrophilic Properties of Polydimethylsiloxane for Possible Microfluidic Sweat Sensor Applications

Sweat contains similar health indicators as blood. Consequently, sweat collection for medical diagnostic purposes is an attractive prospect as it doesn't require needles and can reveal information about electrolyte, hydration, and pH levels in the body. Models of sweat sensors range from rigid structures to more flexible designs that incorporate RFID chips and pH sensitive ionogel indicators. The utility of polydimethylsiloxane's (PDMS) qualities such as chemical inertness an induced hydrophilic surfaces might prove beneficial to microfluidic sweat sensors that could require fewer components, enhance fluid flow, and still maintain desired function. This paper details the initial experiments that primarily focused on measuring water droplets through digital images and contact angle measurement.This project was an undergraduate student research requirement of Central Michigan University's (CMU)Ronald E. McNair Scholars program; itwas intended to further develop skills related to laboratorytechniqueand academic writingunder the guidance of an experienced research mentor.Scanning electron microscopy was explored as an additional means to observe hydrophilic surface properties. Contact angle analysis revealed that repeated exposure to moisture over time reduced the quality and lifetime of hydrophilic PDMS surfaces.

White, Thomas, Tolga Kaya

Proceedings of the 2016 ASEE North Central Section Conference



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