Micro/nanobinary structure of silver films on copper alloys with stable water-repellent property under dynamic conditions
Facile galvanic replacement was adopted to grow cauliflower-like and dendrite coral-like silver films on commercial copper alloy substrates. Both types of silver films possess micro/nanobinary structures, the formation and evolution of which are achieved through the oriented attachment growth mechan...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1992. - 25(2009), 20 vom: 20. Okt., Seite 12299-307 |
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| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2009
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article |
| Zusammenfassung: | Facile galvanic replacement was adopted to grow cauliflower-like and dendrite coral-like silver films on commercial copper alloy substrates. Both types of silver films possess micro/nanobinary structures, the formation and evolution of which are achieved through the oriented attachment growth mechanism. After modification by a monolayer of n-dodecanethiol, the cauliflower-like silver film becomes hydrophobic with a contact angle (CA) of 115 +/- 1 degrees and a CA hysteresis of 74 +/- 1 degrees and the dendrite coral-like silver film exhibits the extreme hydrophobicity characterized by a CA of 158 +/- 1 degrees and a CA hysteresis of less than 2 +/- 1 degrees . Furthermore, the bouncing property of millimeter-sized water droplets on the modified dendrite coral-like silver surface is much better than that on the modified cauliflower-like silver surface. The different wetting property between the two silver films is attributed to the surface roughness. Larger surface roughness provided by the dendrite coral-like silver film means more air pockets, among the micro/nanobinary structures, that bounce water droplets back more strongly. The dynamic bouncing behavior of water droplets, such as restitution coefficient and contact time, on the superhydrophobic modified cauliflower-like silver surface was also investigated at different impact velocities |
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| Beschreibung: | Date Completed 25.01.2010 Date Revised 13.10.2009 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la902936u |