Publication detail

The superhydrophobic properties of self-organized microstructured surfaces derived from anodically oxidized Al/Nb and Al/Ta metal layers

MOZALEV, A. HABAZAKI, H. HUBALEK, J.

Original Title

The superhydrophobic properties of self-organized microstructured surfaces derived from anodically oxidized Al/Nb and Al/Ta metal layers

Type

journal article in Web of Science

Language

English

Original Abstract

Al/Nb (aluminium-on-niobium) and Al/Ta (aluminium-on-tantalum) metal layers sputter-deposited onto Si wafers were anodized respectively in 0.06 and 0.1 mol dm-3 citric acid electrolytes under a high voltage of 480 and 400 V in order to consecutively grow porous alumina layers with the longest interpore distances, this followed by growth of self-organized arrays of micro-sized goblets-like niobium oxide structures and eryngii-mushrooms-like tantalum oxide structures protruding through the alumina barrier layer. The shape and size of the metal oxide microstructures were additionally tailored by post-anodizing treatment combining partial open-circuit dissolution of the alumina pores with reanodizing the underlying metal through the as grown and expanded pores. The structured metal oxide surfaces derived after selectively dissolving away the anodic alumina layers were coated with fluoroalkyl phosphate (FAP) and tested for their non-wetting properties by measuring static contact angles for water droplets. Both the FAP-coated goblet and eryngii-mushroom surfaces showed superhydrophobic behaviour with the contact angles of 158 and 156 deg. respectively. The effect is due to the creation of composite solid–liquid–air interfaces that allow for dramatically decreased liquid-to-solid contact area and adhesion, in accord with the Cassie–Baxter model.

Keywords

porous anodic alumina; tantalum oxide; niobium oxide; microstructures; superhydrophobicity

Authors

MOZALEV, A.; HABAZAKI, H.; HUBALEK, J.

RIV year

2012

Released

1. 11. 2012

Publisher

PERGAMON-ELSEVIER SCIENCE LTD.

Location

THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

ISBN

0013-4686

Periodical

Electrochimica Acta

Year of study

82

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

90

Pages to

97

Pages count

8

URL

http://www.sciencedirect.com/science/article/pii/S0013468612008481

BibTex

@article{BUT96525,
  author="Alexander {Mozalev} and Hiroki {Habazaki} and Jaromír {Hubálek}",
  title="The superhydrophobic properties of self-organized microstructured surfaces derived from anodically oxidized Al/Nb and Al/Ta metal layers",
  journal="Electrochimica Acta",
  year="2012",
  volume="82",
  number="1",
  pages="90--97",
  doi="10.1016/j.electacta.2012.05.065",
  issn="0013-4686",
  url="http://www.sciencedirect.com/science/article/pii/S0013468612008481"
}