不锈钢表面超疏水多壁碳纳米管涂层
Super-Hydrophobic Multi-Walled Carbon Nanotube Coatings for Stainless Steel
摘要：
我们利用AISI 316不锈钢的天然表面粗糙度和铁含量，通过化学气相沉积（CVD）在低温（$< 1000^{\circ}$ C）下直接生长多壁碳纳米管（MWCNT）随机网络，而无需添加任何外部催化剂或耗时的预处理。以这种方式，在不锈钢片上获得超疏水MWCNT膜，其表现出高接触角值（$154^{\circ}$）和高粘附力（高接触角滞后）。此外，在扫描电子显微镜（SEM）的多壁碳纳米管薄膜的调查揭示了一个双重的层次形态的多壁碳纳米管的亲水性碳纳米结构的尖端上的疏水性多壁碳纳米管的无规网络。由于Salvinia效应，MWCNT膜的疏水和亲水复合表面为导电不锈钢提供了固定的超疏水涂层。这种仿生表面不仅可以防止腐蚀和结垢，而且还可以提供低摩擦和减阻。
英文摘要：
We have taken advantage of the native surface roughness and the iron content of AISI 316 stainless steel to direct grow multi-walled carbon nanotube (MWCNT) random networks by chemical vapor deposition (CVD) at low-temperature ($< 1000^{\circ}$C), without the addition of any external catalysts or time-consuming pre-treatments. In this way, super-hydrophobic MWCNT films on stainless steel sheets were obtained, exhibiting high contact angle values ($154^{\circ}$) and high adhesion force (high contact angle hysteresis). Furthermore, the investigation of MWCNT films at scanning electron microscopy (SEM) reveals a two-fold hierarchical morphology of the MWCNT random networks made of hydrophilic carbonaceous nanostructures on the tip of hydrophobic MWCNTs. Owing to the Salvinia effect, the hydrophobic and hydrophilic composite surface of the MWCNT films supplies a stationary super-hydrophobic coating for conductive stainless steel. This biomimetical inspired surface not only may prevent corrosion and fouling but also could provide low-friction and drag-reduction.
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