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Title: A novel technique for investigation of complete and partial anisotropic wetting on structured surface by X-ray microtomography

An experimental study about the anisotropic wetting behavior of a surface patterned with parallel grooves is presented as an application example of a novel technique for investigation of complete and partial anisotropic wetting on structured surface by X-ray microtomography. Shape of glycerin droplets on such surface is investigated by X-ray micro computed tomography (microCT) acting as a non-intrusive, full volume 3D microscope with micrometric spatial resolution. The reconstructed drop volumes enable to estimate the exact volumes of the drops, their base contours, and 3D static contact angles, based on true cross-sections of the drop-surface couple. Droplet base contours are compared to approximate geometrical contour shapes proposed in the literature. Contact angles along slices parallel and perpendicular to the grooves direction are compared with each other. The effect of the sessile drop volume on the wetting behavior is discussed. The proposed technique, which is applicable for any structured surface, enables the direct measure of Wenzel ratio based on the microCT scan in the wetted region usually inapproachable by any others. Comparisons with simplified models are presented and congruence of results with respect to the minimum resolution needed is evaluated and commented.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Department of Engineering and Applied Sciences, University of Bergamo, Bergamo (Italy)
  2. Department of Energy, Politecnico di Milano, Milano (Italy)
  3. Department of Engineering, University of Bergamo, Bergamo (Italy)
  4. School of Engineering and Mathematical Sciences, City University London, London (United Kingdom)
Publication Date:
OSTI Identifier:
22392370
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANISOTROPY; COMPUTERIZED TOMOGRAPHY; DROPLETS; GLYCEROL; MICROSCOPES; SHAPE; SPATIAL RESOLUTION; SURFACES; X RADIATION