Abstract
Here we presented a novel technology to achieve a Super-hydrophobic coating with microscopic roughness on copper surface. First, make a layer of verdigris grow on the fresh pure copper surface. Gain it by exposing the copper to air and the mist of acetic acid solution. The green coating is a mixture of basic copper(II) carbonate and copper(II) acetate. Second heat the coating and make it decompose to CuO. Lastly, form an n-octadecanethiol self-assembled monolayers coating on the outermost surface. Contact angle test, scanning electron microscope analysis and electrochemical testing were carried out to characterize the surface, and a heat transfer experiment for dropwise condensation of steam was performed also. Results show that the modified surface bears a few Super-hydrophobic features, the static contact angle is higher than that in literatures, reaching 153.1±1.7°. The microscopic roughness can be seen in SEM images, differing much from H2O2 etched surface and bare copper surface. The condensation of steam on the surface is a typical form of dropwise condensation, in the measured range of temperature difference, under 0.1 MPa, the average convection heat transfer coefficients of the vertical surface are 1.7∼2.1 times for those of film condensation. At the same time, the inhibition efficiency of surface is improved to some extent comparing with the same kind of SAMs, which suggests that the lifetime of maintenance dropwise condensation would have the possibility to surpass the existing record.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Rose, J. W. (2002). Dropwise condensation theory and experiment: a review. Proceedings Institute of Mechanical Engineers, Part A: J. Power and Energy, 216(2), 115–128
Ma, X. H., Rose, J.W., Xu, D., et al. (2000). Advances in dropwise condensation heat transfer: Chinese research. Chemical Engineering J, 78(2–3), 87–93
Kulkarni, S. A., Ogale, S. B., Vijayamohanan, K. P. (2008). Tuning the hydrophobic properties of silica particles by surface silanization using mixed self-assembled monolayers. Journal of Colloid and Interface Science, 318(2), 372–379
Yang, Q., Gu, A. (2006). Dropwise Condensation on SAM and Electroless Composite Coating Surfaces. Journal of Chemical Engineering of Japan, 39(8), 826–830
Hoque, E., DeRose, J. A., Hoffmann, P. (2007). Chemical stability of non-wetting, low adhesion self-assembled monolayer films formed by perfluoroalkylsilanization of copper. The Journal of Chemical Physics, 126(11), 4706
Blackman, L. C. F., Dewar, M. J. S., Hampson, H. (1957). An investigation of compounds promoting the dropwise condensation of steam. J. Appl. Chem, 7, 160–171
Blackman, L. C. F., Dewar, M. J. S. (1957). Promoters for the dropwise condensation of steam. Parts I–IV. J. Chem. Soc., 162–176
Das, A. K., Kilty, H. P., Marto, P. J., et al. (2000). The use of an organic self-assembled monolayer coating to promote dropwise condensation of steam on horizontal tubes. ASME. J. Heat Transfer, 122(2), 278–286
Das, A. K., Kilty, H.P., Marto. (2000). Dropwise Condensation of Steam on Horizontal Corrugated Tubes Using an Organic Self-Assembled Monolayer Coating. Journal of Enhanced Heat Transfer, 7(2), 109–123
Vemuri, S., Kim, K. J., Wood, B. D., et al. (2006). Long term testing for dropwise condensation using self- assembled monolayer coatings of n-octadecyl mercaptan. Applied Thermal Engineering, 26(4), 421–429
Shukla, N., Svedberg, E. B., Ell J. (2006). FePt nanoparticle adsorption on a chemically patterned silicon-gold substrate. Surface & Coatings Tech., 201(3–4): 1256–1261
Cheng, Y. T., Rodak, D. E., Wong, C. A., et al. (2006). Effects of micro- and nano-structures on the self-cleaning behaviour of lotus leaves. Nanotechnology, 17(5), 1359–1362
Qian, B. T., Shen, Z. Q. (2006). Super-hydrophobic CuO Nanoflowers by Controlled Surface Oxidation on Copper. J. Inorganic Materials, 21(3), 747–752
Masterson, W. L., Hurley, C. N. (2004). Chemistry: Principles and Reactions, 498 5th Ed. Thomson Learning, Inc., Boston.
Ren, N., Zhang, X. F., Bai, J. H., et al. (2001). Study on Thermal Decomposition Kinetics of Copper Acetate Dihydrate with Popescu Method. J. Hebei Normal University (Natural Science Edition), 29(6), 584–587
Željka Petrović, Mirjana Metikoš-Huković, Ranko Babić. (2008). Modification of copper with self-assembled organic coatings. Progress in Organic Coatings, 61(1), 1–6
Zhao, Q., Zhang, D. C., Lin, J. F., et al. (1996). Dropwise condensation on L-B film surface. Chem. Eng. & Proc., 35(6), 473–477
Liang, S. Q., Chen, J., Fang, X. Y., et al. (2005). A visualizing experimental study on dropwise condensation process of steam. J. Engineering Thermophysics, 26(6), 986–988
Ma, X. H., Zhou, X. D., Lan, Z., et al. (2008). Condensation heat transfer enhancement in the presence of non-condensable gas using the interfacial effect of dropwise condensation. Int. J. Heat & Mass Trans., 51(7), 1728–1737
O’Neill, G. A., Westwater, J. W. (1984). Dropwise condensation of steam on electroplated silver surfaces. Int. J. Heat Mass Transf., 27(9), 1539–1549
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Chen, L., Liang, S., Yan, R. et al. n-Octadecanethiol self-assembled monolayer coating with microscopic roughness for dropwise condensation of steam. J. Therm. Sci. 18, 160–165 (2009). https://doi.org/10.1007/s11630-009-0160-z
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11630-009-0160-z