氮气射流低温等离子体处理对落叶松表面润湿性的影响1）

摘要

Nitrogen gas cold atmospheric plasma jet (APPJ) was used to treat the surface of larch to improve its wettability .Sin-gle factor experiment was designed with processing time and processing height to determine the optimal processing condi -tion.The changes of the wettability of the larch surface were analyzed by measuring the surface contact angle and the calcu -lation of free energy of the larch surface .After the treatment ,the contact angle of larch surface was decreased significantly , the free energy and the wettability of larch surface were improved obviously .In terms of a sample with processing section of 40 mm×40 mm, the optimal processing condition of nitrogen gas cold atmospheric plasma jet was with processing time of 20 s and processing height of 15 mm.There were obvious traces of etching on the surface of larch after the treatment , and the roughness of larch surface was increased .Oxygen-related functional groups strengthened the hydrophilia of larch surface , which is conducive to enhancing the wettability of larch surface .%为了提高落叶松的表面润湿性，采用N2射流低温等离子体对落叶松表面进行处理。针对处理时间和处理高度两个因素进行单因素试验设计。通过表面接触角的测试和表面自由能的计算，分析落叶松经N2射流低温等离子体处理前后表面润湿性的变化，得出较佳的处理参数。结果表明：经N2射流低温等离子体处理后落叶松表面接触角显著下降，表面自由能明显提高，落叶松表面润湿性增强。对于处理截面尺寸为40 mm ×40 mm的试件，氮气射流低温等离子体处理落叶松表面的较佳工艺参数为：处理时间20 s，处理高度15 mm。处理后落叶松表面有明显的刻蚀痕迹，表面粗糙度增加，落叶松表面含氧官能团增多，增强了落叶松表面的亲水性，有利于落叶松表面润湿性的提高。