Abstract
In this paper, the dynamics of contact angle and droplet spreading were combined to study wetting process of droplet on porous media, revealing comprehensive information about surface spreading and internal spreading of the droplet. To precisely locate the precursor rim in the droplet spreading test, background subtraction method was proposed for use in visualizing the precursor rim. Two types of micro-/nanoporous copper films fabricated by an electrochemical deposition method were tested. The results indicated that contact angle of the micro-/nanoporous copper films decreased with time quickly and became 0° at last, which is a result of surface spreading combined with down-absorption. The dynamic of precursor rim velocity which can reflect the kinetics of internal spreading was divided into three stages: friction dominant stage, balance stage and exhausting stage. In the friction dominant stage, the velocity of precursor rim can be described by an exponential law, while the velocity of precursor rim in balance stage, which is only affected by the internal characteristics of porous media, was proposed to compare internal wettability of porous media.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
