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Title:Non-Invasive Stretchable Epidermal Modulus Sensor
Author(s):Gur, Onur
Contributor(s):Rogers, John A.
Subject(s):Young's modulus
flexible electronics
Abstract:The purpose of this study is to create a Young’s modulus sensor that would be used on the skin. Knowledge of Young’s modulus can be helpful in detecting skin diseases and evaluating cosmetic products that are aimed at getting rid of wrinkles by changing the properties of skin. The main properties of this sensor are that it is epidermal, stretchable, and piezoelectric. The epidermal nature of this sensor eliminates the need to use any adhesive to attach our device to the skin. The stretchable nature of it enables us to get high performance from the parts of the body that have curves and need sensors with high conformity. We use lead zirconium titanate (PZT), to design a piezoelectric sensor that relies on a sensor actuator working principle. With the introduction of voltage to the actuator, the PZT nano ribbon causes strain on our sensor which propagates on the skin and is detected by the sensor. As a reverse piezoelectric effect, the sensor produces voltage which we collect. Finally, we apply a mathematical model that converts the resulting voltage to a Young’s modulus value. To ensure that our device works properly, we performed tests with Polydimethylsiloxane (PDMS) and compare our modulus values with values taken by dynamic mechanical analyzer (DMA). We performed stretching and peeling tests to confirm the robustness of our device. Finally, we used amps, glycerin, and urea solutions to confirm a plasticizing effect which dictates that the Young’s modulus of the skin should decrease and then restored in 2 hours after the application of above mentioned solutions.
Issue Date:2014-05
Date Available in IDEALS:2014-09-22

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