Superhydrophilicity stabilization

Mirshekari M, Azimirad R, Moshfegh AZ. Superhydrophilic stability enhancement of RF co-sputtered Ti Sij Oj thin films in dark. Appl Surf Sci 2010 256(8) 2500-6. 

Superhydrophilic and superhydrophobic surfaces are more effective at stabilizing two-phase microflows. These surfaces can be obtained by creating roughness utilizing titanium nanoparticles. Titanium modification of a microchannel yields nanometer-scale surface roughness, and subsequent... 

Figure 6.5 (a-b) Profiles of air bubbles on hydrophilic and superhydrophilic surfaces, respectively, in a horizontal position after stabilization, (c-d) Deformation of the air bubble at inclination (at sliding angle) and the change in contact angles. On the hydrophilic surface (c), the air bubble (20 pL) started to slide up at 13 with the maximum/minimum contact angles of 145 and 124 , respectively. On the... 

The stability of the surface wettability was studied by measuring the water contact angles at 24 h., 72 h., and 144 h. after the plasma treatment. There was a general increase in the water contact angle as a function of time after the plasma treatment. The rate of increase in the water contact angle as a function of time after the plasma treatment for the superhydrophilic surfaces was found to be significantly smaller (p < 0.05) than the hydrophilic surfaces (6 < 10°). 

---