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Inherent-opening-controlled pattern formation in carbon nanotube arrays

机译：碳纳米管阵列中的内在开放控制的图案形成

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We have introduced inherent openings into densely packed carbon nanotube arrays to study self-organized pattern formation when the arrays undergo a wetting-dewetting treatment from nanotube tips. These inherent openings, made of circular or elongated hollows in nanotube mats, serve as dewetting centres, from where liquid recedes from. As the dewetting centres initiate dry zones and the dry zones expand, surrounding nanotubes are pulled away from the dewetting centres by liquid surface tension. Among short nanotubes, the self-organized patterns are consistent with the shape of the inherent openings, i.e. slender openings lead to elongated trench-like structures, and circular holes result in relatively round nest-like arrangements. Nanotubes in a relatively high mat are more connected, like in an elastic body, than those in a short mat. Small cracks often initialize themselves in a relatively high mat, along two or more adjacent round openings; each of the cracks evolves into a trench as liquid dries up. Self-organized pattern control with inherent openings needs to initiate the dewetting process above the nanotube tips. If there is no liquid on top, inherent openings barely enlarge themselves after the wetting-dewetting treatment.
机译：我们已经在紧密堆积的碳纳米管阵列中引入了固有的开口，以研究阵列经过纳米管尖端的润湿-去湿处理后的自组织图案形成。这些固有的开口是由纳米管垫中的圆形或细长空心形成的，用作除湿中心，液体从该中心排出。随着去湿中心开始形成干燥区域，并且干燥区域扩展，周围的纳米管通过液体表面张力被拉离去湿中心。在短的纳米管中，自组织的图案与固有开口的形状一致，即细长的开口导致细长的沟槽状结构，而圆形孔导致相对圆形的巢状排列。与在短垫中的纳米管相比，在相对高的垫中的纳米管与弹性体中的连接更多，就像在弹性体中那样。小裂纹通常会沿着两个或多个相邻的圆形开口在相对较高的垫层中初始化;随着液体变干，每个裂缝都会演变成沟槽。具有固有开口的自组织图案控制需要在纳米管尖端上方启动去湿过程。如果顶部没有液体，则在进行润湿-去湿处理后，固有的开口几乎不会扩大。

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