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Control of the hydrophobicity of rare earth oxide coatings deposited by solution precursor plasma spray by hydrocarbon adsorption

Pengyun Xu  Guohui Meng  Larry Pershin  Javad Mostaghimi  Thomas W.Coyle  
【摘要】:The basis of the hydrophobicity of lanthanide rare earth oxides(REOs) has been the subject of considerable debate.To explore this question,the wetting behaviors and surface compositions of hierarchicallystructured Yb_2O_3(one of the REOs) coatings and non-REO Al_2O_3 coatings deposited via solution precursor plasma spray process were investigated in this work.The Yb_2O_3 coatings were subjected to a number of post-deposition treatments including vacuum(1-15 Pa) treatment,Ar-plasma treatment,heat treatment(400℃),long-time air exposure and ultra-high vacuum(1×10~(-7) Pa) treatment.Subsequent characterization showed that different post-deposition treatments resulted in different wetting behavior for the Yb_2O_3 coatings which correlated with the content of hydrocarbon on the surface.Yb_2O_3 coatings exhibited reversible transitions between superhydrophobicity after vacuum treatment and superhydrophilicity after Ar-plasma or heat treatment,linked to hydrocarbon adsorption onto and desorption from the surface.Yb_2O_3 coatings after long-time air exposure and ultra-high vacuum treatment both remained hydrophilic and showed a smaller hydrocarbon content than coatings after vacuum treatment.Al_2O_3 coatings with hierarchical surface structures similar to the Yb_2O_3 coatings showed an increase in WCA to only-170 after the same vacuum treatment,indicating the REO has a much higher affinity for hydrocarbon adsorption than Al_2O_3,and that the content of hydrocarbon adsorbed on the surface of the REO determined the wetting behavior.

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