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Open AccessArticle

Development of Highly pH-Sensitive Hybrid Membranes by Simultaneous Electrospinning of Amphiphilic Nanofibers Reinforced with Graphene Oxide

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New Technologies Research Center (NTRC), Amirkabir University of Technology, Tehran 15914, Iran
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Department of Chemistry, Ardabil Branch, Islamic Azad University, Ardabil 5615731567, Iran
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The Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, University of Dublin, Dublin 2, Ireland
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Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK S7N5A9, Canada
*
Authors to whom correspondence should be addressed.
J. Funct. Biomater. 2019, 10(2), 23; https://doi.org/10.3390/jfb10020023
Received: 12 March 2019 / Revised: 25 April 2019 / Accepted: 8 May 2019 / Published: 21 May 2019
Nanofibrous-based pH sensors have shown promise in a wide range of industrial and medical applications due to their fast response time and good mechanical properties. In the present study, we fabricated pH-sensitive sensors of nanofibrous membranes by electrospinning polyurethane (PU)/poly 2-acrylamido-2-methylpropanesulfonic acid (PAMPS)/graphene oxide (GO) with indicator dyes. The morphology of the electrospun nanofibers was examined using scanning electron microscopy (SEM). The effect of hydrophilic polymer ratio and concentration of GO on the sensing response time was investigated. The sensitivity of the membranes was studied over a wide pH range (1–8) in solution tests, with color change measured by calculating total color difference using UV-vis spectroscopy. The membranes were also subjected to vapor tests at three different pH values (1, 4, 8). SEM results show the successful fabrication of bimodal fiber diameter distributions of PU (mean fiber diameter 519 nm) and PAMPS (mean fiber diameter 78 nm). Sensing response time decreased dramatically with increasing concentrations of PAMPS and GO. The hybrid hydrophobic/hydrophilic/GO nanofibrous membranes are capable of instantly responding to changes in solution pH as well as detecting pH changes in chemical vapor solution in as little as 7 s. View Full-Text
Keywords: pH sensitive; protective clothing; wound dressing; bimodal membrane pH sensitive; protective clothing; wound dressing; bimodal membrane
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MDPI and ACS Style

Gorji, M.; Sadeghianmaryan, A.; Rajabinejad, H.; Nasherolahkam, S.; Chen, X. Development of Highly pH-Sensitive Hybrid Membranes by Simultaneous Electrospinning of Amphiphilic Nanofibers Reinforced with Graphene Oxide. J. Funct. Biomater. 2019, 10, 23.

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