全氟聚醚液滴在固体表面的铺展行为

he spreading of perfluoropolyether (PFPE) droplets on solid surfaces has been measured from the top-down view through a microscope system. Effects of substrates, molecular weight and end-group functionality on spreading of the PFPE droplets have been studied experimentally and the results were compared with Molecular Dynamic (MD) simulations. Silicon wafer and DLC substrates were used to study the effect of substrates on spreading. Two types of PFPE, Zdol and Ztetraol, with the same chain structure and various molecular weights (2000 and 4000 g/mol) were employed in experiments. Effect of molecular weight has been investigated through comparing the spreading of Zdol2000 and Zdol4000, and it is found that the increase of molecular weight will decrease the mobility of PFPE. The comparison between spreading of Zdol and Ztetraol of the same molecular weight proved that functional end group plays a significant role on the spreading of PFPE, which confirmed the MD simulation results.