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Superhydrophobicity on two-tier rough surfaces fabricated by controlled growth of aligned carbon nanotube arrays coated with fluorocarbon.
Langmuir 2005; 21(24):11208-12L

Abstract

Considerable effort has been expended on theoretical studies of superhydrophobic surfaces with two-tier (micro and nano) roughness, but experimental studies are few due to the difficulties in fabricating such surfaces in a controllable way. The objective of this work is to experimentally study the wetting and hydrophobicity of water droplets on two-tier rough surfaces for comparison with theoretical analyses. To compare wetting on micropatterned silicon surfaces with wetting on nanoscale roughness surfaces, two model systems are fabricated: carbon nanotube arrays on silicon wafers and carbon nanotube arrays on carbon nanotube films. All surfaces are coated with 20 nm thick fluorocarbon films to obtain low surface energies. The results show that the microstructural characteristics must be optimized to achieve stable superhydrophobicity on microscale rough surfaces. However, the presence of nanoscale roughness allows a much broader range of surface design criteria, decreases the contact angle hysteresis to less than 1 degrees , and establishes stable and robust superhydrophobicity, although nanoscale roughness could not increase the apparent contact angle significantly if the microscale roughness dominates.

Authors+Show Affiliations

School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

16285792

Citation

Zhu, Lingbo, et al. "Superhydrophobicity On Two-tier Rough Surfaces Fabricated By Controlled Growth of Aligned Carbon Nanotube Arrays Coated With Fluorocarbon." Langmuir : the ACS Journal of Surfaces and Colloids, vol. 21, no. 24, 2005, pp. 11208-12.
Zhu L, Xiu Y, Xu J, et al. Superhydrophobicity on two-tier rough surfaces fabricated by controlled growth of aligned carbon nanotube arrays coated with fluorocarbon. Langmuir. 2005;21(24):11208-12.
Zhu, L., Xiu, Y., Xu, J., Tamirisa, P. A., Hess, D. W., & Wong, C. P. (2005). Superhydrophobicity on two-tier rough surfaces fabricated by controlled growth of aligned carbon nanotube arrays coated with fluorocarbon. Langmuir : the ACS Journal of Surfaces and Colloids, 21(24), pp. 11208-12.
Zhu L, et al. Superhydrophobicity On Two-tier Rough Surfaces Fabricated By Controlled Growth of Aligned Carbon Nanotube Arrays Coated With Fluorocarbon. Langmuir. 2005 Nov 22;21(24):11208-12. PubMed PMID: 16285792.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Superhydrophobicity on two-tier rough surfaces fabricated by controlled growth of aligned carbon nanotube arrays coated with fluorocarbon. AU - Zhu,Lingbo, AU - Xiu,Yonghao, AU - Xu,Jianwen, AU - Tamirisa,Prabhakar A, AU - Hess,Dennis W, AU - Wong,Ching-Ping, PY - 2005/11/16/pubmed PY - 2007/4/6/medline PY - 2005/11/16/entrez SP - 11208 EP - 12 JF - Langmuir : the ACS journal of surfaces and colloids JO - Langmuir VL - 21 IS - 24 N2 - Considerable effort has been expended on theoretical studies of superhydrophobic surfaces with two-tier (micro and nano) roughness, but experimental studies are few due to the difficulties in fabricating such surfaces in a controllable way. The objective of this work is to experimentally study the wetting and hydrophobicity of water droplets on two-tier rough surfaces for comparison with theoretical analyses. To compare wetting on micropatterned silicon surfaces with wetting on nanoscale roughness surfaces, two model systems are fabricated: carbon nanotube arrays on silicon wafers and carbon nanotube arrays on carbon nanotube films. All surfaces are coated with 20 nm thick fluorocarbon films to obtain low surface energies. The results show that the microstructural characteristics must be optimized to achieve stable superhydrophobicity on microscale rough surfaces. However, the presence of nanoscale roughness allows a much broader range of surface design criteria, decreases the contact angle hysteresis to less than 1 degrees , and establishes stable and robust superhydrophobicity, although nanoscale roughness could not increase the apparent contact angle significantly if the microscale roughness dominates. SN - 0743-7463 UR - https://www.unboundmedicine.com/medline/citation/16285792/Superhydrophobicity_on_two_tier_rough_surfaces_fabricated_by_controlled_growth_of_aligned_carbon_nanotube_arrays_coated_with_fluorocarbon_ L2 - https://dx.doi.org/10.1021/la051410+ DB - PRIME DP - Unbound Medicine ER -