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      Hydrophobicity Improvement of PET Fabrics after SF 6 Plasma Treatment


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          We have used plasma assisted surface fluorination of polyethylene terephthalate (PET) fabrics to increase the water repellency of the fabrics. Treatment at different operating conditions for the radio-frequency inductively coupled in a SF 6 atmosphere resulted in improved hydrophobicity. The water repellency of treated fabrics was characterized by water contact angle and absorption time measurement. The measured contact angle of optimum-treated fabrics was 140 degrees, and the absorption time was 210 min. The morphology changes in the surface of PET were obtained by scanning electron microscopy and atomic force microscopy. The rms surface roughness of PET was increased from 28 nm to 45 nm after plasma treatment. The changes in chemical composition were observed in X-ray photoelectron spectra (XPS) analysis. We found that the F/C atom ratios obtaining by XPS analysis on PET were correlated to the pressure, the RF power, and the treatment time. An increase in the F/C atom ratios seems to contribute to the absorption time.

          Most cited references20

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          Characterization and Distribution of Water-repellent, Self-cleaning Plant Surfaces

          C Neinhuis (1997)
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            Quantitative assessment to the structural basis of water repellency in natural and technical surfaces.

            Many plant surfaces are water-repellent because of a complex 3-dimensional microstructure of the epidermal cells (papillae) and a superimposed layer of hydrophobic wax crystals. Due to its surface tension, water does not spread on such surfaces but forms spherical droplets that lie only on the tips of the microstructures. Studying six species with heavily microstructured surfaces by a new type of confocal light microscopy, the number, height, and average distance of papillae per unit area were measured. These measurements were combined with those of an atomic force microscope which was used to measure the exposed area of the fine-structure on individual papillae. According to calculations based upon these measurements, roughening results in a reduction of the contact area of more than 95% compared with the projected area of a water droplet. By applying water/methanol solutions of decreasing surface tension to a selection of 33 water-repellent species showing different types of surface structures, the critical value at which wetting occurs was determined. The results impressively demonstrated the importance of roughening on different length scales for water-repellency, since extremely papillose surfaces, having an additional wax layer, are able to resist up to 70% methanol. Surfaces that lack papillae or similar structures on the same length scale are much more easily wetted.
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              Influence of surface roughness on water- and oil-repellent surfaces coated with nanoparticles


                Author and article information

                International Polymer Processing
                Carl Hanser Verlag
                : 23
                : 2
                : 135-139
                1 Department of Physics, Faculty of Science, Chulalongkorn University Bangkok, Thailand
                2 Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University Bangkok, Thailand
                Author notes
                Mail address: Satreerat K. Hodak, Department of Physics, Faculty of Science, Chulalongkorn University Bangkok, Thailand. E-mail: Satreerat.H@ 123456chula.ac.th
                © 2008, Carl Hanser Verlag, Munich
                : 18 December 2006
                : 17 January 2008
                Page count
                References: 20, Pages: 5
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Invited Papers

                Polymer science,Materials technology,Materials characterization,General engineering,Polymer chemistry


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