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ACS Appl Mater Interfaces

Title:		VOC-Induced Flexing of Single and Multilayer Polyethylene Films As Gas Sensors
Author(s):		Alipour N; Andersson RL; Olsson RT; Gedde UW; Hedenqvist MS;
Address:		"KTH Royal Institute of Technology, School of Chemical Science and Engineering, Fibre and Polymer Technology SE-100 44 Stockholm, Sweden"
Journal Title:		ACS Appl Mater Interfaces
Year:		2016
Volume:		20160406
Issue:		15
Page Number:		9946 - 9953
DOI:		10.1021/acsami.6b01178
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"The differential swelling and bending of multilayer polymeric films due to the dissimilar uptake of volatile organic compounds (VOCs; n-hexane, limonene) in the different layers was studied. Motions of thin polyethylene films triggered by the penetrant were investigated to learn more about how their deformation is related to VOC absorption. Single layers of metallocene or low-density polyethylene, and multilayers (2-288 layers) of these in alternating positions were considered. Single-, 24-, and 288-layer films displayed no motion when uniformly subjected to VOCs, but they could display simple curving modes when only one side of the film was wetted with a liquid VOC. Two-layer films displayed simple bending when uniformly subjected to VOCs due to the different swelling in the two layers, but when the VOC was applied to only one side of the film, more complex modes of motion as well as dynamic oscillations were observed (e.g., constant amplitude wagging at 2 Hz for ca. 50 s until all the VOC had evaporated). Diffusion modeling was used to study the transport behavior of VOCs inside the films and the different bending modes. Finally a prototype VOC sensor was developed, where the reproducible curving of the two-layer film was calibrated with n-hexane. The sensor is simple, cost-efficient, and nondestructive and requires no electricity"
Keywords:		VOC sensor flexing modeling multilayer films polyethylene;
Notes:		"PubMed-not-MEDLINEAlipour, Nazanin Andersson, Richard L Olsson, Richard T Gedde, Ulf W Hedenqvist, Mikael S eng Research Support, Non-U.S. Gov't 2016/03/30 ACS Appl Mater Interfaces. 2016 Apr 20; 8(15):9946-53. doi: 10.1021/acsami.6b01178. Epub 2016 Apr 6"