钛种植体表面润湿性控制的实验研究

Surface Modification and Wettability Control of Titanium Dental Implant

首先用喷砂酸蚀法对钛种植体表面进行粗化处理,制备出具有微米-纳米双微观孔洞结构的超亲水表面。然后用等离子体氧化的工艺,制备具有超亲水性能的氧化钛表面,发现表面亲水性能随自偏压的增加先减小后增加,随处理时间的增加而减小。在360V自偏压、20 min处理时间和1 ml/min(标准状态)氧气流量时能到超亲水效果的锐钛矿二氧化钛表面。最后尝试用十二烷基三氯硅烷和分子自组装法在粗糙的氧化钛表面制备疏水表面,最大角度可达120°,利用等离子体处理和紫外光照射成功实现了表面由超亲水到疏水之间的转换。

The surfaces of the titanium dental implant modified in three steps.First,it was roughened by sandblast-acid etching.Next,the roughened surface was modified by plasma oxidation,a novel technique developed on the basis of plasma enhanced chemical vapor deposition to create the micro-nano structures with superhydrophility.The impacts of the oxidation conditions,including bias voltage,oxidation time,and oxygen flow rate,on water contact angle were evaluated.As the bias increased,the water contact angle of the surface varied in a decrease-increase mode;and decreased with an increase of oxidation time.At an oxygen flow rate of 1 ml/min,a bias of 360 V and for 30 min,the anatase-phased,superhydrophilic TiO2 surfaces were obtained.Finally,the oxidized surfaces were coated with self-assembled monolayer deposited in dodecyltrichlorosilane;and its highest water contact angle was found to be 120°,realizing the superhydrophilic to hydrophobic transition.We found that superhydrophilic-hydrophobic surfaces transition can be tuned well by ultraviolet（UV） light irradiation and argon plasma sputtering.