PSI - Issue 28

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 ScienceDirect

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Procedia Structural Integrity 28 (2020) 1679–1685

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract The aim of the present work is to study aqueous reduced graphene oxide (rGO) dispersions through the application of Electrical Impedance Spectroscopy. The first step of the production of rGO/cement composites is the production of such dispersions. Six rGO dispersions were produced corresponding to different concentrations of the binder. Ultrasonic energy was applied in all dispersions and their electrical properties are measured through the application of Electrical Impedance Spectroscopy during ultrasonication. The experimental results showed that the appropriate rGO concentration was at 0.15 wt% of the binder, as the dispersion was dense enough for the production of conductive networks, and at sonication energy of 60 kJ, as significant decrease of electrical impedance was noticed. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review nder responsibility of the European Structural Integrity Society (ESIS) ExCo 1 st Virtual European Conference on Fracture Study of Reduced Graphene Oxide Dispersions via Electrical Impedance Spectroscopy Angeliki-Eirini Dimou a , Ioanna Sakellariou a , George M. Maistros b , Nikolaos D. Alexopoulos a,* a University of the Aegean, School of Engineering, Department of Financial Engineering, 821 32 Chios, Greece b ADVISE, 17 Gymnasiarchou Madia St., 82100 Chios, Greece Abstract The aim of the present work is to study aqueous reduced graphene oxide (rGO) dispersions through the application of Electrical Impedance Spectroscopy. The first step of the production of rGO/cement composites is the production of such dispersions. Six rGO dispersions were produced corresponding to different concentrations of the binder. Ultrasonic energy was applied in all dispersions and their electrical properties are measured through the application of Electrical Impedance Spectroscopy during ultrasonication. The experimental results showed that the appropriate rGO concentration was at 0.15 wt% of the binder, as the dispersion was dense enough for the production of conductive networks, and at sonication energy of 60 kJ, as significant decrease of electrical impedance was noticed. 1 st Virtual European Conference on Fracture Study of Reduced Graphe e Oxide Dispersions via Electrical Impedance Spectroscopy Angeliki-Eirini Dimou a , Ioanna Sakellariou a , George M. M istros b , Nikolaos D. Alexopoulos a,* a University of the Aegean, School of Engineering, Department of Financial Engineering, 821 32 Chios, Greece b ADVISE, 17 Gymnasiarchou Madia St., 82100 Chios, Greece Keywords: reduced graphene oxide (rGO), dispersion, Electrical Impedance Spectroscopy (EIS)

Keywords: reduced graphene oxide (rGO), dispersion, Electrical Impedance Spectroscopy (EIS)

* Corresponding author. Tel.: +30 22710 35464 E-mail address: nalexop@aegean.gr * Corresponding author. Tel.: +30 22710 35464 E-mail address: nalexop@aegean.gr

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.142