The aim of this work was the wettability improvement of clay‐coated paper by ambient air plasma exposure. Industrial corona with a volume dielectric barrier discharge in cylindrical configuration was used as a plasma source; the exposure times varied from 0.25 up to 5 s. Water contact angle (WCA) measurement and surface free energy (SFE) evaluation were carried out for the estimation of wettability changes. Plasma treatment in the duration of 0.25 s was sufficient to decrease the WCA almost to the half of the original value, which was 76°. SFE of paper has increased by 40%–50% after plasma treatment. Long‐term ageing effect study of treated samples was carried out up to 3 months after the treatment. WCA did not reach the original value even after 3 months, and it was still 20%–30% lower. O/C ratio increased from 0.7 to 1.8 in case of 5‐s plasma treatment, and the new chemical bonds (C=O, O–C=O) were created on the surface.

中文翻译：

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空气中大气压等离子体对粘土涂布纸的表面改性

这项工作的目的是通过暴露在空气中的等离子体中来改善粘土涂布纸的润湿性。具有圆柱形配置的体积电介质势垒放电的工业电晕用作等离子体源；曝光时间从0.25到5 s不等。进行了水接触角（WCA）测量和表面自由能（SFE）评估，以评估润湿性变化。在0.25 s的时间内进行等离子体处理足以将WCA降低至原始值（76°）的一半。经过等离子处理后，纸张的SFE增加了40％–50％。在处理后长达3个月的时间里，对处理过的样品进行了长期老化效果研究。即使在3个月后，WCA仍未达到原始值，但仍降低了20％–30％。O / C比从0.7增加到1。