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Effect of glycerol on the mechanical and temperature-sensing properties of pectin films

Costanza, Vincenzo and Bonanomi, Luca and Moscato, Giovanni and Wang, Linghui and Choi, Yeong Suk and Daraio, Chiara (2019) Effect of glycerol on the mechanical and temperature-sensing properties of pectin films. Applied Physics Letters, 115 (19). Art. No. 193702. ISSN 0003-6951. doi:10.1063/1.5121710.

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Temperature-sensitive films embedded in electronic skins (e-skins) can provide temperature feedback to robots, high-tech prostheses, and wearable devices for health care monitoring. Pectin-based films have shown a temperature response at least two orders of magnitude higher than previously reported temperature-sensing materials. However, they are not easily stretchable and tearable, which limit their applications as e-skins that require repetitive bending and mechanical stresses. Here, we show how the addition of glycerol as a plasticizer in the fabrication of pectin-based films improves their mechanical properties. We report how the enhancement of the mechanical performance is accompanied by a decrease in the temperature responsivity. Through thermogravimetric analysis, we show that this reduction in responsivity can be associated with water retention due to the addition of the plasticizer. The link between the water content and the temperature response demonstrates that a dehydrated status of pectin is crucial to record its high temperature responsivity. Combining electrical and thermal characterization with the tensile strength test, we estimate the optimal concentration of glycerol for improving the mechanical properties without compromising the temperature response of the pectin films.

Item Type:Article
Related URLs:
URLURL TypeDescription Material
Costanza, Vincenzo0000-0002-2409-0632
Moscato, Giovanni0000-0001-5326-143X
Choi, Yeong Suk0000-0002-7231-9921
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2019 Published under license by AIP Publishing. Submitted: 30 July 2019; Accepted: 17 October 2019; Published Online: 7 November 2019. This research was funded by the Samsung Electronic GRO Program.
Funding AgencyGrant Number
Samsung ElectronicsUNSPECIFIED
Issue or Number:19
Record Number:CaltechAUTHORS:20191107-073748308
Persistent URL:
Official Citation:Effect of glycerol on the mechanical and temperature-sensing properties of pectin films. Vincenzo Costanza, Luca Bonanomi, Giovanni Moscato, Linghui Wang, Yeong Suk Choi, and Chiara Daraio. Applied Physics Letters 115:19.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99718
Deposited By: Tony Diaz
Deposited On:07 Nov 2019 18:13
Last Modified:16 Nov 2021 17:48

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