Research of Bihydrogel Particles as pH and Thermal Microsensor
Date Issued
2015
Date
2015
Author(s)
Hsu, Chia-Wei
Abstract
Stimuli-sensitive hydrogels change dramatically in volume in response to alterations of certain environmental parameter. In recent years, this category of materials has attracted much attention in field of sensors. We proposed a pH microsensor consisting of two parallel phases of pH-sensitive hydrogel, acrylic acid, and insensitive hydrogel, PEGDA[1]. Working similarly to bimetallic strip, this type of sensor can bend to different degree on the corresponding environmental parameter and therefore was named bihydrogel microsensers. To demonstrate this general idea is also workable for microsensors sensitive to environmental parameters other than pH value, we use temperature-sensitive hydrogel, NIPAAm, and PEGDA to form temperature bihydrogel microsensors. We measure the response time of the temperature bihydrogel microsensors, and also apply them to measure the temperature rise caused by Joule heating in microchannel. Besides we also propose H-shaped pH and temperature bihydrogel microsensors with two separate phases of stimuli-sensitive and insensitive hydrogels. With marked graduations on the phase of stimuli-insensitive hydrogel, the measurements of the environmental parameters are more direct and convenient. These freestanding bihydrogel particles are low-cost and easy to manufacture by stop-flow lithography printing technique in PDMS microchannel. They are particularly suitable for use in confined environment where most sensors are unable to fit in.
Subjects
bihydrogel
stimuli-sensitive hydrogel
thermal sensor
Type
thesis
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