Print Email Facebook Twitter Fluorocarbon coatings deposited on micron-sized particles by atmospheric PECVD Title Fluorocarbon coatings deposited on micron-sized particles by atmospheric PECVD Author Abadjieva, E. van der Heijden, A.E.D.M. Creyghton, Y.L.M. van Ommen, J.R. Publication year 2012 Abstract Fluorocarbon coatings have been deposited on micron-sized silica particles by means of atmospheric pressure plasma-enhanced chemical vapor deposition (PECVD). The silica particles have a diameter in the range between 40 and 70 ?m. They are fluidized at atmospheric pressure in a circulating fluidized bed combined with a dielectric barrier discharge (DBD) reactor. Four coatings have been produced with four different precursors, respectively, octafluorocyclobutane (C 4F 8), hexafluoropropylene (C 3F 6), trifluorethanol (C 2H 3OF 3) and hexafluoro-2-propanol (C 3H 2OF 6). The Ar filamentary discharges are sustained with a plasma power of 150 W at 25 kHz. The chemical and morphological features of the coatings are investigated by means of scanning electron microscopy (SEM), X-ray microanalysis, and X-ray photoelectron spectroscopy (XPS). All coatings have a flake-like morphology and variable thickness. The F/C ratio, also called "Teflon" parameter, has the following values: 1.37, 1.09, 0.30 and 1.45 for each of the four precursors, respectively. The coating produced with trifluorethanol is highly cross-linked, but has relatively poor fluorinated surface. The highest surface fluorination is achieved, when octafluorocyclobutane is used as a precursor. The presented results enable the comparison and selection of precursors, so that particle surface functionality may be developed for improved blast performance and sensitivity of advanced energetic materials. The XPS C 1s peak of the coating deposited in filamentary Ar/C 3F 6 discharge can be fitted with five peaks. The chemical nature of the coating is characterized by nearly equal contribution of the CF, CF 2 and CF 3 bonds. The F/C ratio, also called Teflon character, is 1.09. The coating, with a thickness up to few microns, is deposited on micron-sized particles using PECVD in a fluidized bed. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Subject Fluid Mechanics Chemistry & EnergeticsEM - Energetic MaterialsTS - Technical SciencesDefence, Safety and SecurityAtmospheric pressureFuidzed bedFuorocarbon coatingPrticlesPlasma-enhanced chemical vapor deposition (PE-CVD) To reference this document use: http://resolver.tudelft.nl/uuid:b42d5d6c-1e51-4ec5-8455-3a22572006cd DOI https://doi.org/10.1002/ppap.201100044 TNO identifier 446767 ISSN 1612-8850 Source Plasma Processes and Polymers, 9 (2), 217-224 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.