© The Institution of Engineering and Technology
Since there is currently no method to selectively fabricate superhydrophobic regions on superhydrophilic surfaces of metal substrates, wettability patterns on metal substrates are prepared via the three-step technique including superhydrophilic, superhydrophobic and selectively superhydrophilic modifications. Here, an innovative method that can selectively lower surface energy of superhydrophilic surfaces, and thereby makes it more convenient to fabricate the wettability patterns, is proposed. Chemical etching is used to formulate micro/nanoscale rough structures and fabricate superhydrophilic aluminium (Al) surface, which is then covered by patterned mask whose main composition is siloxane. Removing the mask after 80°C water bath heating for 20 s, the covered Al surface has been modified to become superhydrophobic (contact angles >165°, sliding angles <1.5°), while the uncovered region is still superhydrophilic, and wettability patterns are therefore obtained. Fourier transform infrared spectrophotometer and Raman spectra indicate that the change of wettability is induced by hydrophobic groups on the modified surfaces. The superhydrophobic surfaces fabricated by this method have excellent high-temperature resistance. The method proposed is simple, rapid and environmental-friendly.
References
-
-
1)
-
5. Boreyko, J.B., Srijanto, B.R., Nguyen, T.D., et al: ‘Dynamic defrosting on nanostructured superhydrophobic surfaces’, Langmuir, 2013, 29, (30), pp. 9516–9524 (doi: 10.1021/la401282c).
-
2)
-
16. Li, J., Huang, Z., Wang, F., et al: ‘One-step preparation of transparent superhydrophobic coatings using atmospheric arc discharge’, Appl. Phys. Lett., 2015, 107, (5), p. 51603 (doi: 10.1063/1.4927745).
-
3)
-
24. Wenzel, R.N.: ‘Resistance of solid surfaces to wetting by water’, Ind. Eng. Chem., 1936, 28, (8), pp. 988–994 (doi: 10.1021/ie50320a024).
-
4)
-
22. Wenzel, R.N.: ‘Surface roughness and contact angle’, J. Phys. Chem., 1949, 9, (53), pp. 1466–1467 (doi: 10.1021/j150474a015).
-
5)
-
1. Li, X.M., Reinhoudt, D., Crego-Calama, M.: ‘What do we need for a superhydrophobic surface? A review on the recent progress in the preparation of superhydrophobic surfaces’, Chem. Soc. Rev., 2007, 36, (8), pp. 1350–1368 (doi: 10.1039/b602486f).
-
6)
-
20. Lancastre, J.J.H., Margaça, F.M.A., Ferreira, L.M., et al: ‘Thermal analysis and SANS characterisation of hybrid materials for biomedical applications’, J. Therm. Anal. Calorim., 2012, 109, (1), pp. 413–418 (doi: 10.1007/s10973-011-1459-z).
-
7)
-
4. Wang, P., Zhang, D., Qiu, R., et al: ‘Super-hydrophobic metal-complex film fabricated electrochemically on copper as a barrier to corrosive medium’, Corros. Sci., 2014, 83, pp. 317–326 (doi: 10.1016/j.corsci.2014.02.028).
-
8)
-
11. Balu, B., Berry, A.D., Hess, D.W., et al: ‘Patterning of superhydrophobic paper to control the mobility of micro-liter drops for two-dimensional lab-on-paper applications’, Lab Chip, 2009, 9, (21), pp. 3066–3075 (doi: 10.1039/b909868b).
-
9)
-
18. Téllez, L., Rubio, J., Rubio, F.: ‘Synthesis of inorganic-organic hybrid materials from TEOS, TBT and PDMS’, J. Mater. Sci., 2003, (38), pp. 1773–1780 (doi: 10.1023/A:1023240129477).
-
10)
-
10. Yang, X., Liu, X., Lu, Y., et al: ‘Controllable water adhesion and anisotropic sliding on patterned superhydrophobic surface for droplet manipulation’, J. Phys. Chem. C, 2016, 120, (13), pp. 7233–7240 (doi: 10.1021/acs.jpcc.6b02067).
-
11)
-
13. Zheng, H., Huang, S., Liu, J., et al: ‘Vein-like directional transport platform of water on open aluminium substrate’, Micro Nano Lett., 2016, 11, (5), pp. 269–272 (doi: 10.1049/mnl.2015.0588).
-
12)
-
20. Song, J.L., Xu, W.J., Liu, X., et al: ‘Ultrafast fabrication of rough structures required by superhydrophobic surfaces on Al substrates using an immersion method’, Chem. Eng. J., 2012, 211–212, pp. 143–152 (doi: 10.1016/j.cej.2012.09.094).
-
13)
-
7. Mertaniemi, H., Jokinen, V., Sainiemi, L., et al: ‘Superhydrophobic tracks for low-friction, guided transport of water droplets’, Adv. Mater., 2011, 23, (26), pp. 2911–2914 (doi: 10.1002/adma.201100461).
-
14)
-
26. Seo, J., Lee, S., Lee, J., Lee, T.: ‘Guided transport of water droplets on superhydrophobic–hydrophilic patterned Si nanowires’, ACS Appl. Mater. Inter., 2011, 3, (12), pp. 4722–4729 (doi: 10.1021/am2011756).
-
15)
-
2. Fürstner, R., Barthlott, W., Neinhuis, C., et al: ‘Wetting and self-cleaning properties of artificial superhydrophobic surfaces’, Langmuir, 2005, 21, (3), pp. 956–961 (doi: 10.1021/la0401011).
-
16)
-
22. Cassie, A.B.D., Baxter, S.: ‘Wettability of porous surfaces’, Trans. Faraday Soc., 1944, 40, pp. 546–551 (doi: 10.1039/tf9444000546).
-
17)
-
12. Chen, F., Xu, W., Lu, Y., et al: ‘Hydrophilic patterning of superhydrophobic surfaces by atmospheric-pressure plasma jet’, Micro Nano Lett., 2015, 10, (2), pp. 105–108 (doi: 10.1049/mnl.2014.0590).
-
18)
-
14. Ghosh, A., Ganguly, R., Schutzius, T.M., et al: ‘Wettability patterning for high-rate, pumpless fluid transport on open, non-planar microfluidic platforms’, Lab Chip, 2014, 14, (9), pp. 1538–1550 (doi: 10.1039/C3LC51406D).
-
19)
-
8. Jokinen, V., Sainiemi, L., Franssila, S.: ‘Complex droplets on chemically modified silicon nanograss’, Adv. Mater., 2008, 20, (18), pp. 3453–3456 (doi: 10.1002/adma.200800160).
-
20)
-
19. Kang, J.S., Hwang, S.Y., Lee, M.S., et al: ‘SERS of dithiocarbamate pesticides adsorbed on silver surface; Thiram’, B. Korean Chem. Soc., 2002, 23, (11), pp. 20–1610.
-
21)
-
17. Kumagai, S., Wang, X.S., Yoshimura, N.: ‘Solid residue formation of RTV silicone rubber due to dry-band arcing and thermal decomposition’, IEEE Trans. Dielectr. Electr. Inul., 1998, 5, (2), pp. 281–289 (doi: 10.1109/94.671962).
-
22)
-
3. Cheng, Y., Rodak, D.E.: ‘Is the lotus leaf superhydrophobic?’, Appl. Phys. Lett., 2005, 86, (14), p. 144101 (doi: 10.1063/1.1895487).
http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2016.0187
Related content
content/journals/10.1049/mnl.2016.0187
pub_keyword,iet_inspecKeyword,pub_concept
6
6