Wettability Investigation of UV-O3 and Acid Functionalized MWCNT and MWCNT-PMMA Nanocomposites by Contact Angle MeasurementReport as inadecuate

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Journal of Nanomaterials - Volume 2015 2015, Article ID 130270, 12 pages -

Research Article

Department of Fusion Chemical Engineering, Hanyang University, Ansan 426-791, Republic of Korea

Sabic SPADC, Riyadh Techno-Valley, Riyadh 11195, Saudi Arabia

Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia

Department of Materials Science and Engineering, Seoul National University of Science & Technology, Seoul 139-743, Republic of Korea

Institute for Frontier Materials, Deakin University, Geelong, VIC 3220, Australia

Received 20 November 2014; Revised 17 December 2014; Accepted 17 December 2014

Academic Editor: Yingkui Yang

Copyright © 2015 Seil Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The dispersion state of individual MWCNT in the polymer matrix influences the mechanical, thermal, and electrical properties of the resulting composite. One method of obtaining a good dispersion state of MWCNT in a polymer matrix is to functionalize the surface of MWCNT using various treatments to enhance the surface energy and increase the dispersibility of MWCNT. In this study, wettability and surface energy of UV-O3 and acid-treated multiwall carbon nanotubes MWCNTs and its polymethyl methacrylate PMMA polymer nanocomposites were measured using contact angle analysis in various solvent media. Contact angle analysis was based on ethylene glycol-water-glycerol probe liquid set and data was further fitted into geometric mean Fowkes, van Oss-Chaudhury-Good GvOC, and Chang-Qing-Chen CQC models to determine both nonpolar and acid base surface energy components. Analysis was conducted on MWCNT thin films subjected to different levels of UV-O3 and acid treatments as well as their resulting MWCNT-PMMA nanocomposites. Contact angle analysis of thin films and nanocomposites revealed that the total surface energy of all samples was well fitted with each other. In addition, CQC model was able to determine the surface nature and polarity of MWCNT and its nanocomposites. Results indicated that the wettability changes in the thin film and its nanocomposites are due to the change in surface chemistry. Finally, electrical properties of nanocomposites were measured to investigate the effect of surface functionality acid or basic on the MWCNT surfaces.

Author: Seil Kim, Abdullah A. Kafi, Ehsan Bafekpour, Young-In Lee, Bronwyn Fox, Manwar Hussain, and Yong-Ho Choa

Source: https://www.hindawi.com/


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