Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-03T08:18:37.409Z Has data issue: false hasContentIssue false
  • English
  • Français

Electrochemical Wettability Control on Cu/CuxO Core-Shell Dendrites: In-Situ Droplet Modulation and On-Demand Oil-Water Separation

Published online by Cambridge University Press:  11 April 2018

Chun Haow Kung ,
Beniamin Zahiri ,
Pradeep Kumar Sow  and
Walter Mérida
Chun Haow Kung
Affiliation:
Clean Energy Research Centre, The University of British Columbia, 6250Applied Science Lane, Vancouver, BC V6T 1Z4, Canada
Beniamin Zahiri
Affiliation:
Clean Energy Research Centre, The University of British Columbia, 6250Applied Science Lane, Vancouver, BC V6T 1Z4, Canada
Pradeep Kumar Sow
Affiliation:
Department of Chemical Engineering, BITS Pilani, K.K. Birla Goa Campus, Goa, India
Walter Mérida*
Affiliation:
Clean Energy Research Centre, The University of British Columbia, 6250Applied Science Lane, Vancouver, BC V6T 1Z4, Canada
*
*(Email: [email protected])
Get access

Abstract

Stimuli-responsive materials with controlled reversible wettability find diverse application as self-cleaning surfaces, tunable optical lenses and microfluidic devices. We report on an electrochemical approach for dynamic control over the wetting properties of additive-free Cu/CuxO core-shell dendritic structures. By varying the oxidation state of the oxide shell phase, the entire wettability range spanning superhydrophobicity (contact angle > 150°) to superhydrophilicity (contact angle < 10°) can be precisely adjusted in-situ. During the wetting transitions, the surface transforms from a low adhesive rolling state (lotus effect) to high adhesive pinning state (petal effect), and eventually to superhydrophilic state with a water-absorbing ability (fish scale wetting). The wetting alteration is reversible via air-drying at room temperature or mild heat drying at 100°C. The reversibly redox-driven wettability switching is demonstrated for controllable oil-water separation with efficiency higher than 98 percent.

Keywords

core/shellresponsivepurificationnanostructurein situ
Type
Articles
Information
MRS Advances , Volume 3 , Issue 53: Energy Materials and Technologies , 2018 , pp. 3163 - 3169
Copyright
Copyright © Materials Research Society 2018 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Xin, B. and Hao, J., Chem. Soc. Rev. 39, 769 (2010).CrossRefGoogle Scholar
Liu, Y., Yao, W., Wang, G., Wang, Y., Moita, A.S., Han, Z., and Ren, L., Chem. Eng. J. 303, 565 (2016).CrossRefGoogle Scholar
Guo, F. and Guo, Z., RSC Adv. 6, 36623 (2016).CrossRefGoogle Scholar
Wang, S., Liu, K., Yao, X., and Jiang, L., Chem. Rev. 115, 8230 (2015).CrossRefGoogle Scholar
Zahiri, B., Sow, P.K., Kung, C.H., and Mérida, W., Adv. Mater. Interfaces 4, (2017).Google Scholar
Tu, S.H., Wu, H.C., Wu, C.J., Cheng, S.L., Sheng, Y.J., and Tsao, H.K., Appl. Surf. Sci. 316, 88 (2014).CrossRefGoogle Scholar
Su, B., Jiang, L., Jiang, X., and Yu, A., Powder Technol. 312, 103 (2017).CrossRefGoogle Scholar
Dawood, M.K., Zheng, H., Liew, T.H., Leong, K.C., Foo, Y.L., Rajagopalan, R., Khan, S.A., and Choi, W.K., Langmuir 27, 4126 (2011).CrossRefGoogle Scholar
Iro, Z.S., Subramani, C., and Dash, S.S., Int. J. Electrochem. Sci. 11, 10628 (2016).CrossRefGoogle Scholar
Kung, C. Haow, Zahiri, B., Sow, P. Kumar, and Mérida, W., Appl. Surf. Sci. 444, 15 (2018).CrossRefGoogle Scholar