The inner and outer surfaces of bamboo stems are usually removed prior to the manufacture of bamboo panels because the surfaces are hydrophobic and difficult to bond with glue. Hence, the recovery and utilization ratio of bamboo during processing is low. This study focused on using glow-discharge plasma to treat green bamboo surfaces to make them less hydrophobic. The effects of plasma treatment on green bamboo stems were examined using contact goniometry (wettability), non-contact confocal profilometry and scanning electron microscopy (SEM). Confocal profilometry and SEM revealed that the morphology of green bamboo surfaces varied between 3 different stems. Plasma was able to etch bamboo green surfaces, and make them rougher and more powdery. Plasma treatment was effective at converting green bamboo surfaces from hydrophobic (initial contact angle >110°) to hydrophilic (contact angle <20°). However, this effect was temporary and contact angle increased with time and recovered approximately 30% of its original value after 24 h. Based on our findings, we conclude that plasma treatment can alter parameters such as surface energy and roughness that could improve glue bonding of green bamboo, but delays between plasma treatment and further processing would need to be minimized.

中文翻译：

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辉光放电等离子体处理对竹绿色表面接触角和微观形貌的影响

通常在制造竹镶板之前将竹茎的内表面和外表面除去，因为它们的表面是疏水性的并且难以与胶水粘结。因此，竹子在加工过程中的回收利用率低。这项研究的重点是使用辉光放电等离子体处理绿色竹子表面，使其疏水性降低。使用接触测角法（润湿性），非接触共聚焦轮廓测定法和扫描电子显微镜（SEM）检查了等离子体处理对青竹茎的影响。共聚焦轮廓仪和扫描电镜显示，青竹表面的形态在3个不同的茎之间变化。等离子能够蚀刻出竹绿色的表面，并使它们更粗糙，更粉状。等离子处理可有效地将绿色竹子表面从疏水性（初始接触角> 110°）转变为亲水性（接触角<20°）。但是，这种影响是暂时的，接触角随时间增加，并在24小时后恢复到其原始值的约30％。根据我们的发现，我们得出结论认为，等离子处理可以改变诸如表面能和粗糙度之类的参数，这些参数可以改善生竹的胶粘力，但是等离子处理与进一步处理之间的延迟需要最小化。