Fine-tuning of superhydrophobicity based on monolayers of well-defined raspberry nanoparticles with variable dual-roughness size and ratio

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Abstract

Superhydrophobic surfaces have been extensively investigated for self-cleaning, low-adhesion, anti-corrosion or reduced-drag applications. Roughness and its characteristics, i.e., morphology, overall roughness and individual feature size, is an essential factor for superhydrophobicity. Several experimental methods and theoretical models strived to predict how the surface wettability is affected by the surface roughness. However, due to the difficulty of making practical surfaces with well-defined roughness profiles, only limited and arbitrary experimental studies focused on practical superhydrophobic films. Here, the roughness factors which determine the wetting properties of films are reported, based on monolayers of well-defined raspberry silica-silica nanoparticles, exhibiting a wide-range and systematic variation of individual features sizes and ratios (large over small features). The advancing water contact angle does not depend on the feature size or ratio, while the contact angle hysteresis (CAH) is strongly dependent on both. The minimum size and size ratio to reach superhydrophobicity were determined. These new insights into the wetting of rough surfaces can be used to direct the design of practical superhydrophobic materials for advanced applications such as solar panels, microelectronics or microfluidic devices.
LanguageEnglish
Pages5745-5752
Number of pages8
JournalAdvanced Functional Materials
Volume24
Issue number36
DOIs
StatePublished - 2014

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Monolayers
roughness
Tuning
Surface roughness
tuning
Nanoparticles
nanoparticles
Wetting
Silicon Dioxide
wetting
Contact angle
Silica
silicon dioxide
microfluidic devices
wettability
Microfluidics
microelectronics
Microelectronics
cleaning
drag

Cite this

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title = "Fine-tuning of superhydrophobicity based on monolayers of well-defined raspberry nanoparticles with variable dual-roughness size and ratio",
abstract = "Superhydrophobic surfaces have been extensively investigated for self-cleaning, low-adhesion, anti-corrosion or reduced-drag applications. Roughness and its characteristics, i.e., morphology, overall roughness and individual feature size, is an essential factor for superhydrophobicity. Several experimental methods and theoretical models strived to predict how the surface wettability is affected by the surface roughness. However, due to the difficulty of making practical surfaces with well-defined roughness profiles, only limited and arbitrary experimental studies focused on practical superhydrophobic films. Here, the roughness factors which determine the wetting properties of films are reported, based on monolayers of well-defined raspberry silica-silica nanoparticles, exhibiting a wide-range and systematic variation of individual features sizes and ratios (large over small features). The advancing water contact angle does not depend on the feature size or ratio, while the contact angle hysteresis (CAH) is strongly dependent on both. The minimum size and size ratio to reach superhydrophobicity were determined. These new insights into the wetting of rough surfaces can be used to direct the design of practical superhydrophobic materials for advanced applications such as solar panels, microelectronics or microfluidic devices.",
author = "C.C.M. Carcouet and A.C.C. Esteves and M.M.R.M. Hendrix and {Benthem, van}, R.A.T.M. and {With, de}, G.",
year = "2014",
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pages = "5745--5752",
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T1 - Fine-tuning of superhydrophobicity based on monolayers of well-defined raspberry nanoparticles with variable dual-roughness size and ratio

AU - Carcouet,C.C.M.

AU - Esteves,A.C.C.

AU - Hendrix,M.M.R.M.

AU - Benthem, van,R.A.T.M.

AU - With, de,G.

PY - 2014

Y1 - 2014

N2 - Superhydrophobic surfaces have been extensively investigated for self-cleaning, low-adhesion, anti-corrosion or reduced-drag applications. Roughness and its characteristics, i.e., morphology, overall roughness and individual feature size, is an essential factor for superhydrophobicity. Several experimental methods and theoretical models strived to predict how the surface wettability is affected by the surface roughness. However, due to the difficulty of making practical surfaces with well-defined roughness profiles, only limited and arbitrary experimental studies focused on practical superhydrophobic films. Here, the roughness factors which determine the wetting properties of films are reported, based on monolayers of well-defined raspberry silica-silica nanoparticles, exhibiting a wide-range and systematic variation of individual features sizes and ratios (large over small features). The advancing water contact angle does not depend on the feature size or ratio, while the contact angle hysteresis (CAH) is strongly dependent on both. The minimum size and size ratio to reach superhydrophobicity were determined. These new insights into the wetting of rough surfaces can be used to direct the design of practical superhydrophobic materials for advanced applications such as solar panels, microelectronics or microfluidic devices.

AB - Superhydrophobic surfaces have been extensively investigated for self-cleaning, low-adhesion, anti-corrosion or reduced-drag applications. Roughness and its characteristics, i.e., morphology, overall roughness and individual feature size, is an essential factor for superhydrophobicity. Several experimental methods and theoretical models strived to predict how the surface wettability is affected by the surface roughness. However, due to the difficulty of making practical surfaces with well-defined roughness profiles, only limited and arbitrary experimental studies focused on practical superhydrophobic films. Here, the roughness factors which determine the wetting properties of films are reported, based on monolayers of well-defined raspberry silica-silica nanoparticles, exhibiting a wide-range and systematic variation of individual features sizes and ratios (large over small features). The advancing water contact angle does not depend on the feature size or ratio, while the contact angle hysteresis (CAH) is strongly dependent on both. The minimum size and size ratio to reach superhydrophobicity were determined. These new insights into the wetting of rough surfaces can be used to direct the design of practical superhydrophobic materials for advanced applications such as solar panels, microelectronics or microfluidic devices.

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DO - 10.1002/adfm.201400111

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T2 - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

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