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Mr Si Qui

PhD Student, Harbin Institute of Technology

Topic: Surface energy components of single carbon fibre


Carbon fibers (CFs) have received much attention lately for their multiple potential applications when combined with matrix materials owing to their excellent mechanical properties. They are usually coated with an organic layer (sizing) to increase their adhesion to polymer matrices. Despite the importance of CFs in the composite field, studies dedicated to the wetting dynamics of single carbon fibers have been poorly documented. In this study, dynamic contact angles of diiodomethane, formamide, and ethylene glycol, on T300 CFs were measured using the methodology that permits us to measure dynamic contact angles by taking into consideration both the intrinsic variability of the carbon fibre diameter and the extremely small amplitude of the capillary forces.  Advancing and receding contact angles were calculated at various test velocities. The experimental dynamic contact angle values were then fitted by the MKT and HD approaches which allowed to model the wetting dynamics and to establish static contact angles values and finally the SEC of single CFs.


Si Qiu is a PhD student in Materials Science and Engineering at Harbin Institute of Technology (HIT). He was at KU Leuven for 12 months (since 2014 October) as a joint PhD student supported by the China Scholarship Council (CSC) scholarship. PhD Project: The wettability and carbonization modification of carbon fibres.

Major publication: Si Qiu, et al. “Wettability of a Single Carbon Fiber.” langmuir 2016, 32, 9697−9705