Effects Of Naoh Solution Storage On Long-Term Stability Of Superhydrophilic Tio2-X Layer On Surface Of Pure Titanium

The plasma oxidation method can produce a gradient TiO2-x layer on the surface of pure titanium implants, which significantly improves the hydrophilicity and biocompatibility of the surface. However, due to the adsorption of pollutants in the air for a long time, the surface of the implants easily loses these characteristics. Therefore, some storage methods are needed to prevent surface failure. In this study, the glow plasma discharge technology was used to perform plasma oxidation on the surface of pure titanium by sandblasting acid-etching (SLA), and then the oxidized samples were stored in NaOH solution. The surface characteristics before and after storage of NaOH solution were analyzed. The timeliness of hydrophilicity after storing NaOH solution in different time period was observed, and the effects of long-term storage of NaOH solution and normal saline on surface hydrophilicity were compared. The results show that the plasma oxidation surface morphology and chemical composition after NaOH solution treatment do not change much; The storage time of NaOH solution has no effect on the timeliness of hydrophilicity; Whether the NaOH solution remains do not affect the hydrophilicity; The oxidized samples are directly stored in NaOH solution or saline, which can maintain the superhydrophilic surface for a long time. NaOH solution is better than normal saline as for the long-term stability of superhydrophilicity on pure titanium surface.