Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지
DOI QR코드

DOI QR Code

Dynamic Sliding Behavior of Water Droplets on the Coated Hydrophobic Surfaces

발수코팅된 표면에서의 수적의 동적 전락거동

  • Song, Jeong-Hwan (Dept. of Information and Electronic Materials Engineering, PaiChai University) ;
  • Nakajima, Akira (Dept. of Metallurgy and Ceramic Science, Tokyo Institute of Technology)
  • 송정환 (배재대학교 정보전자소재공학과) ;
  • 중도장 (동경공업대학 이공학연구과 재료공학)
  • Published : 2007.11.27
Download PDF
⟨ Previous Next ⟩

Abstract

The static and dynamic hydrophobicities of the water droplets placed on a hydrophobic surface coated using a fluoroalkylsilanes monolayer with different molecular chain lengths were investigated through direct observation of the actual droplet motion during the sliding process. The surface roughness of both was found to be less than 1 nm. The static contact angles of the coated FAS-3 and FAS-17 were respectively $80^{\circ}$ and $108^{\circ}$ at $150^{\circ}C$, 1 h. The slope of sliding acceleration against the water droplet mass exhibited an inflection point, thus suggesting the switching of the dominant sliding mode from slipping to rolling. While their sliding angles were similar in value, notable differences were exhibited in terms of their sliding behavior. This can be understood as being due to the contribution of the shear stress difference at the interface between the solid surface and water during the sliding process. These results show that the sliding acceleration of the water droplets depends strongly on the balance between gravitational and retentive forces on the hydrophobic surface.

Keywords

References

  1. W. A. Zisman, Ind. Eng. Chem., 55, 19 (1963) https://doi.org/10.1021/ie50646a003
  2. R. E. Baier and P. E. Meyer, Chemtech, 16, 178 (1986)
  3. P. L. Nostro, Adv. Colloid. Interf. Sci., 56, 245 (1995) https://doi.org/10.1016/0001-8686(95)00234-H
  4. G. Yamauchi, K. Takai and H. Saito, IEICE Trans. Electron., E83-C, 1139 (2000)
  5. M. Morra, E. Occhiello and F. Garbassi, Langmuir, 5, 872 (1989) https://doi.org/10.1021/la00087a050
  6. R. N. Wenzel, J. Phys. Colloid Chem., 53, 1466 (1949) https://doi.org/10.1021/j150474a015
  7. N. Ogawa, M. Soga, Y. Takada and I. Nakayama, Jpn, J. Appl. Phys., 32, 614 (1993) https://doi.org/10.1143/JJAP.32.614
  8. H. Murase, K. Nanishi, H. Kogure, T. Fujibayashi, K. Tamura and N. Haruta, J. Appl. Polym. Sci., 54, 2051 (1994) https://doi.org/10.1002/app.1994.070541307
  9. K. Tsujii, T. Yamamoto, T. Onda and S. Shibuichi, Angew. Chem. Int. Ed. Engl., 36, 1011 (1997) https://doi.org/10.1002/anie.199710111
  10. M. Miwa, A. Nakajima, A. Fujishirna, K. Hashimoto and T. Watanabe, Langmuir, 16, 5754 (2000) https://doi.org/10.1021/la991660o
  11. O. Takai, A. Hozumi, Y. Inoue and T. Komori, Bull. Mater. Sci., 20, 817 (1997) https://doi.org/10.1007/BF02747421
  12. T. Nishino, M. Meguro, K. Nakamae, M. Matsushita and Y. Ueda, Langmuir, 15, 4321 (1999) https://doi.org/10.1021/la981727s
  13. R. E. Johnson Jr. and R. H. Dettre, Surface and Colloid Science, Vol. 2, p. 85, ed. E. Matijevic, Wiley, New York, (1969)
  14. A. Carre and M.E.R. Shanahan, J. Adhes., 49, 177 (1995) https://doi.org/10.1080/00218469508014354
  15. E. Wolfram and R. Faust, Wetting, Spreading and Adhesion, p. 213, ed. J. F. Paddy, Academic Press Inc., New York, (1978)
  16. J. P. Youngblood and T. J. McCarthy, Macromolecules, 32, 6800 (1999) https://doi.org/10.1021/ma9903456
  17. A. Nakajima, S. Suzuki, Y. Kameshima, N. Yoshida, T. Watanabe and K. Okada, Chem. Lett., 32, 1148 (2003) https://doi.org/10.1246/cl.2003.1148
  18. D. Richard and D. Quere, Europhys. Lett., 48, 286 (1999) https://doi.org/10.1209/epl/i1999-00479-1
  19. N. Yoshida, Y. Abe, H. Shigeta, A. Nakajima, H. Ohsaki, K. Hashimoto and T. Watanabe, J. Am. Chem. Soc., 128, 743 (2006) https://doi.org/10.1021/ja050617m
  20. M. Sakai, A. Hashimoto, N. Yoshida, S. Suzuki, Y. Kameshima and A. Nakajima, Rev. Sci. Instrum., 78, 045103 (2007) https://doi.org/10.1063/1.2716005
  21. K. Honda, M. Morita, H. Otsuka and A. Takahara, Macromolecules, 38, 5699 (2005) https://doi.org/10.1021/ma050394k
  22. D. K. Owens and R. C. Wendt, J. Appl. Polym. Sci., 13, 1741 (1969) https://doi.org/10.1002/app.1969.070130815