Hydrophilicity modification of poly(methyl methacrylate) by excimer laser ablation and irradiation
Hydrophilicity modification of poly(methyl methacrylate) by excimer laser ablation and irradiation
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DOI：
10.1007/s10404-007-0234-8
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发表时间：
2008-07-01
影响因子：
2.8
通讯作者：
Zuo, Tiechuan
中科院分区：
文献类型：
--
作者：
Qi, Heng;Chen, Tao;Zuo, Tiechuan
由于准分子激光烧蚀的微加工特性，在聚甲基丙烯酸甲酯（PMMA）基片上烧蚀出的微通道具有一定的表面粗糙度。利用这一特性，可以在制造过程中通过光化学烧蚀机制和表面粗糙度的影响直接改变PMMA微通道的亲水性。在相同能量密度的烧蚀条件下，接触角与表面粗糙度成反比，通过合理选择烧蚀参数（7.38 J/cm（2），20 Hz，10 mm/min），接触角可减小到25 °。在低于烧蚀阈值的能量密度下，准分子激光照射PMMA基底不同的照射时间，也会导致表面变得更加亲水，而表面形貌没有任何明显的变化。接触角随辐照次数的增加而减小，辐照2,500次后达到饱和状态。在相同的辐照时间下，较高的能量密度导致PMMA基底更亲水。
Because of the micromachining characteristic of excimer laser ablation, the microchannels ablated with this technique on poly(methyl methacrylate) (PMMA) substrate have definite surface roughness. Utilizing this characteristic, the hydrophilicity of PMMA microchannels could be directly modified during fabrication process both by the mechanism of photochemical ablation and the effect of surface roughness. The contact angle is inversely proportional to the surface roughness under ablation with same fluence and could be reduced to 25 degrees by choosing ablation parameters reasonably (7.38 J/cm(2), 20 Hz, 10 mm/min). Excimer laser irradiation of PMMA substrates for different irradiation times at fluence below the ablation threshold also results in the surfaces becoming more hydrophilic without any marked change in the surface topography. The contact angle decreases with the increase of irradiation times and finally reaches the saturated status after irradiation for 2,500 times. Under same irradiation times, higher fluence led to PMMA substrates more hydrophilic.