Surface analysis of hydrophobicity of Thai silk treated by SF6 plasma

• Main Authors: P. Suanpoot, K. Kueseng, S. Ortmann, R. Kaufmann, C. Umongno, P. Nimmanpipug, D. Boonyawan, T. Vilaithong
• Format: Journal
• Published: 2018
• Subjects: Materials Science; Physics and Astronomy
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=50349087018&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/60503
• Institution: Chiang Mai University

Hydrophobicity of Thai silk has been improved by plasma treatment using SF6gases discharged by an inductively coupled plasma (ICP). The plasma was generated under a pressure range of 1.3-40.0 Pa while the RF power input is in a range of 20-100 W. A single RF compensated Langmuir probe and optical emission spectroscopy (OES) were used for the plasma diagnostics. The mechanisms responsible for the hydrophobic behavior were evaluated by SEM, X-ray photoelectron spectroscopy (XPS), attenuated total reflection (ATR) infrared spectroscopy, and were compared with quantum mechanical calculation. ATR-IR detected slightly changes for the peak intensities of the bands located in the frequency region of 1000-1050 cm- 1. XPS analysis results show the presence of CF-CF group as the increment of C/F ratio with increasing pressures. The results also agree with the density functional calculation. A fluorine radical shows the deposition by CH + F-→ CF + H-reaction. © 2008 Elsevier B.V. All rights reserved.