Liu Huan, Zhai Jin, Jiang Lei
Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080.
Soft Matter. 2006 Sep 19;2(10):811-821. doi: 10.1039/b606654b.
This review covers recent advances in the wettability of aligned carbon nanotubes (ACNT). Carbon nanotubes (CNT) are inherently somewhat hydrophilic, with a water contact angle of less than 86°. When they are arranged in a textured manner on substrates having different surface topographies, different wettabilities are exhibited. These range from hydrophilic to hydrophobic, and even superhydrophobic, and with isotropic to anisotropic contact angle (CA) hysteresis. If chemical modification is involved, the wettability can be adjusted from superhydrophobic to superhydrophilic on a certain structured ACNTs. Here, we first examine the structural influence of isotropic roughness on this effect (including nano-structures and hierarchical structures), where isotropic wetting (including wetting and anti-wetting) is observed. Water can wet the nano-structured CNT alignment, resulting in self-assembly; on the other hand, superhydrophobicity is durable on hierarchical and chemically-modified nano-structured alignments. Secondly, the effects of anisotropic roughness on wetting behavior are discussed. Finally, we suggest the remaining challenges in the field, and several practical applications of ACNT possessing special wettability.
本综述涵盖了取向碳纳米管（ACNT）润湿性的最新进展。碳纳米管（CNT）本质上具有一定的亲水性，水接触角小于86°。当它们以有纹理的方式排列在具有不同表面形貌的基底上时，会表现出不同的润湿性。这些润湿性范围从亲水性到疏水性，甚至超疏水性，并且具有各向同性到各向异性的接触角（CA）滞后现象。如果涉及化学改性，则在某些结构化的ACNT上，润湿性可以从超疏水性调节为超亲水性。在此，我们首先研究各向同性粗糙度对这种效应的结构影响（包括纳米结构和分级结构），其中观察到各向同性润湿（包括润湿和抗润湿）。水可以润湿纳米结构的CNT排列，从而导致自组装；另一方面，超疏水性在分级和化学改性的纳米结构排列上是持久的。其次，讨论了各向异性粗糙度对润湿行为的影响。最后，我们提出了该领域仍然存在的挑战，以及具有特殊润湿性的ACNT的一些实际应用。
