Investigating the Surface Superhydrophilic and Superhydrophobic Modification Using Nanoscale Bilayers Assembly on Stainless Steel Plate

This study investigated the use of nanoscale bilayers assembly for superhydrophilic and superhydrophobic surface modification on stainless steel plate. This study performed nanoscale bilayers assembly method, as well as chemical vapor deposition (CVD) to perform fluorosilan treatment on the modification surface, to modify the surface structure and thereby the wettability of the surface at 16, 17, 18, and 19 bilayers. At 16 bilayers, the contact angle is 7 degrees; at 17 bilayers, the contac t angle is 5 degrees; at 18 bilayers, the contact angle is 4 degrees, satisfying the requirement for superhydrophibicity; at 19 bilayers, the contact angle is 8 degrees. According to experimental results, surface modification was able to reduce the contact angle of water on a stainless steel flat plate. The hydrophilic surface was further modified into a hydrophobic. Experimental results showed 18 bilayers to yield the largest contact angle of 153 degrees (compared to 87 degrees on the unmodified surface), corresponding to the highest surface superhydrophobicity.