Details
| Original language | English |
|---|---|
| Article number | 1528 |
| Pages (from-to) | 1-17 |
| Number of pages | 17 |
| Journal | Polymers |
| Volume | 12 |
| Issue number | 7 |
| Publication status | Published - 10 Jul 2020 |
| Externally published | Yes |
Abstract
The wetting of rough polymer surfaces is of great importance for many technical applications. In this paper, we demonstrate the relationship between the mean roughness values and the fractal dimension of rough and self-affine PTFE surfaces. We have usedwhite light interferometrymeasurements to obtain information about the complex topography of the technical surfaces having different height distributions. Two different methods for the calculation of the fractal dimension were used: The height difference correlation function (HDC) and the cube counting method. It was demonstrated that the mean roughness value (Ra) correlates better with the fractal dimension Df determined by the cube counting method than with the Df values obtained from HDC calculations. However, the HDC values show a stronger dependency by changing the surface roughness. The advancing and receding contact angles as well as the contact angle hysteresis of PTFE samples of different roughness were studied by the modifiedWilhelmy balance technique using deionized water as a liquid. The modifiedWilhelmy balance technique enables the possibility for future analysis of very rough PTFE surfaces which are difficult to investigate with the sessile drop method.
Keywords
- Contact angle, Contact angle hysteresis, Fractal dimension, Mean roughness, Modified Wilhelmy balance technique, Polytetrafluoroethylene, PTFE, Roughness, Wetting, White light interferometry
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- Polymers and Plastics
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In: Polymers, Vol. 12, No. 7, 1528, 10.07.2020, p. 1-17.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Characterization of rough PTFE surfaces by the modified wilhelmy balance technique
AU - Karl, Christian W.
AU - Krauklis, Andrey E.
AU - Lang, Andrej
AU - Giese, Ulrich
N1 - Funding Information: Author Contributions: C.W.K. conceived and performed the experiments; C.W.K., A.E.K., and A.L. analyzed the data; C.W.K., A.E.K., A.L., and U.G. wrote the paper. Financial support for vital parts of this project was provided by the German Rubber Institute and SINTEF Industry (internal research funding). All authors have read and agreed to the published version of the manuscript.
PY - 2020/7/10
Y1 - 2020/7/10
N2 - The wetting of rough polymer surfaces is of great importance for many technical applications. In this paper, we demonstrate the relationship between the mean roughness values and the fractal dimension of rough and self-affine PTFE surfaces. We have usedwhite light interferometrymeasurements to obtain information about the complex topography of the technical surfaces having different height distributions. Two different methods for the calculation of the fractal dimension were used: The height difference correlation function (HDC) and the cube counting method. It was demonstrated that the mean roughness value (Ra) correlates better with the fractal dimension Df determined by the cube counting method than with the Df values obtained from HDC calculations. However, the HDC values show a stronger dependency by changing the surface roughness. The advancing and receding contact angles as well as the contact angle hysteresis of PTFE samples of different roughness were studied by the modifiedWilhelmy balance technique using deionized water as a liquid. The modifiedWilhelmy balance technique enables the possibility for future analysis of very rough PTFE surfaces which are difficult to investigate with the sessile drop method.
AB - The wetting of rough polymer surfaces is of great importance for many technical applications. In this paper, we demonstrate the relationship between the mean roughness values and the fractal dimension of rough and self-affine PTFE surfaces. We have usedwhite light interferometrymeasurements to obtain information about the complex topography of the technical surfaces having different height distributions. Two different methods for the calculation of the fractal dimension were used: The height difference correlation function (HDC) and the cube counting method. It was demonstrated that the mean roughness value (Ra) correlates better with the fractal dimension Df determined by the cube counting method than with the Df values obtained from HDC calculations. However, the HDC values show a stronger dependency by changing the surface roughness. The advancing and receding contact angles as well as the contact angle hysteresis of PTFE samples of different roughness were studied by the modifiedWilhelmy balance technique using deionized water as a liquid. The modifiedWilhelmy balance technique enables the possibility for future analysis of very rough PTFE surfaces which are difficult to investigate with the sessile drop method.
KW - Contact angle
KW - Contact angle hysteresis
KW - Fractal dimension
KW - Mean roughness
KW - Modified Wilhelmy balance technique
KW - Polytetrafluoroethylene
KW - PTFE
KW - Roughness
KW - Wetting
KW - White light interferometry
UR - http://www.scopus.com/inward/record.url?scp=85088299857&partnerID=8YFLogxK
U2 - 10.3390/polym12071528
DO - 10.3390/polym12071528
M3 - Article
AN - SCOPUS:85088299857
VL - 12
SP - 1
EP - 17
JO - Polymers
JF - Polymers
SN - 2073-4360
IS - 7
M1 - 1528
ER -