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* TITLE Self-pinning by colloids confined at a contact line
Name Affiliation E-mail
ByungMook Weon POSTECH bmweon(at)postech.ac.kr
* HOST(Applicant)
Name Affiliation E-mail
YONGSEOK CHO APCTP ysjho(at)apctp.org
* DATE / TIME 2012-08-30, 4:00 PM
* PLACE 503 Conference room, APCTP Headquarters, Pohang
Colloidal particles suspended in a fluid usually inhibit complete wetting of the fluid on a solid surface and cause pinning of the contact line, known as \\\'selfpinning\\\'. We show differences in spreading and drying behaviors of pure and colloidal droplets using optical and confocal imaging methods. These differences come from spreading inhibition by colloids confined at a contact line. We propose a self-pinning mechanism based on spreading inhibition by colloids. We find a good agreement between the mechanism and the experimental result taken by directly tracking individual colloids near the contact lines of evaporating colloidal droplets.
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