Uncertainties in contact angle goniometry

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Uncertainties in contact angle goniometry. / Vuckovac, Maja; Latikka, Mika; Liu, Kai; Huhtamäki, Tommi; Ras, Robin H.A.

In: Soft Matter, Vol. 15, No. 35, 21.09.2019, p. 7089-7096.

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@article{5baf722c68c548328daa8728f65b7f46,
title = "Uncertainties in contact angle goniometry",
abstract = "The most widely used method to quantify the wetting properties of surfaces is by measuring contact angles. Even though contact angle goniometry is a powerful technique for characterizing wetting properties, it is not accurate for very hydrophobic surfaces. As the technique relies on image processing, it has inherent errors due to optical limitations, especially near the three-phase contact line. This leads to uncertainties in the positioning of the baseline, which can cause large errors in the measured contact angles. In this paper, we systematically evaluate these errors both theoretically and experimentally, focusing on the importance of image resolution. For ∼9 microliter droplet, displacement of the baseline by a single pixel leads to errors of approximately ±0.5° to ±1° for contact angles up to 150°, and errors increase rapidly in the superhydrophobic regime, up to ±8°. The error in the contact angle can be slightly reduced by increasing the image resolution, but cannot be eliminated entirely.",
author = "Maja Vuckovac and Mika Latikka and Kai Liu and Tommi Huhtam{\"a}ki and Ras, {Robin H.A.}",
note = "| openaire: EC/H2020/725513/EU//SuperRepel",
year = "2019",
month = "9",
day = "21",
doi = "10.1039/c9sm01221d",
language = "English",
volume = "15",
pages = "7089--7096",
journal = "Soft Matter",
issn = "1744-683X",
number = "35",

}

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TY - JOUR

T1 - Uncertainties in contact angle goniometry

AU - Vuckovac, Maja

AU - Latikka, Mika

AU - Liu, Kai

AU - Huhtamäki, Tommi

AU - Ras, Robin H.A.

N1 - | openaire: EC/H2020/725513/EU//SuperRepel

PY - 2019/9/21

Y1 - 2019/9/21

N2 - The most widely used method to quantify the wetting properties of surfaces is by measuring contact angles. Even though contact angle goniometry is a powerful technique for characterizing wetting properties, it is not accurate for very hydrophobic surfaces. As the technique relies on image processing, it has inherent errors due to optical limitations, especially near the three-phase contact line. This leads to uncertainties in the positioning of the baseline, which can cause large errors in the measured contact angles. In this paper, we systematically evaluate these errors both theoretically and experimentally, focusing on the importance of image resolution. For ∼9 microliter droplet, displacement of the baseline by a single pixel leads to errors of approximately ±0.5° to ±1° for contact angles up to 150°, and errors increase rapidly in the superhydrophobic regime, up to ±8°. The error in the contact angle can be slightly reduced by increasing the image resolution, but cannot be eliminated entirely.

AB - The most widely used method to quantify the wetting properties of surfaces is by measuring contact angles. Even though contact angle goniometry is a powerful technique for characterizing wetting properties, it is not accurate for very hydrophobic surfaces. As the technique relies on image processing, it has inherent errors due to optical limitations, especially near the three-phase contact line. This leads to uncertainties in the positioning of the baseline, which can cause large errors in the measured contact angles. In this paper, we systematically evaluate these errors both theoretically and experimentally, focusing on the importance of image resolution. For ∼9 microliter droplet, displacement of the baseline by a single pixel leads to errors of approximately ±0.5° to ±1° for contact angles up to 150°, and errors increase rapidly in the superhydrophobic regime, up to ±8°. The error in the contact angle can be slightly reduced by increasing the image resolution, but cannot be eliminated entirely.

UR - http://www.scopus.com/inward/record.url?scp=85072056486&partnerID=8YFLogxK

U2 - 10.1039/c9sm01221d

DO - 10.1039/c9sm01221d

M3 - Article

VL - 15

SP - 7089

EP - 7096

JO - Soft Matter

JF - Soft Matter

SN - 1744-683X

IS - 35

ER -

ID: 36962399