TY  - JOUR
A1  - Schreier, Julia
A1  - Furat, Orkun
A1  - Cankaya, Murat
A1  - Schmidt, Volker
A1  - Bröckel, Ulrich
T1  - Automated evaluation of contact angles in a three-phase system of selective agglomeration in liquids
T2  - Image Analysis & Stereology
N2  - This study aims to an automated evaluation of contact angles in a three-phase system of selective agglomeration in liquids. Wetting properties, quantified by contact angles, are essential in many industries and their processes. Selective agglomeration as a three-phase system consists of a suspension liquid, a heterogeneous solid phase and an immiscible binding liquid. It offers the chance of establishing more efficient separation processes because of the shape-dependent wetting properties of fine particles (size ≤ 10 µm). In the present paper, an experimental setup for contact angle measurements of fine particles based on the Sessile Drop Method is described. Moreover, a new algorithm is discussed, which can be used to automatically compute contact angles from image data captured by a high-speed camera. The algorithm uses a marker-based watershed transform to segment the image data into regions representing the droplet, the carrier plate coated by fine particles, and the background. The main idea is a parametric modelling approach forthe time-dependent droplet’s contour by an ellipse.

The results show that the development of the dynamic contact angles towards a static contact angle can be efficiently determined based on this novel technique. These findings are useful for a detailed discrimination of wetting properties of spherical and irregularly shaped particles as well as their wetting kinetics. Also, a better understanding of selective agglomeration processes will be promoted by this user-friendly method.
KW  - Benetzung
KW  - Agglomerieren
KW  - Dreiphasensystem
KW  - Bildverarbeitung
KW  - automated detection
KW  - contact angle
KW  - image data
KW  - parametric contour modelling
KW  - selective agglomeration
KW  - three-phase system
Y1  - 2020
UR  - https://hst.opus.hbz-nrw.de/frontdoor/index/index/docId/118
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:tr5-1188
VL  - 39
IS  - 3
SP  - 187
EP  - 196
PB  - Slovenian Society for Stereology and Quantitative Image Analysis
ER  -