Catalytic Processes and Materials, IMPACT and MESA+, University of Twente, PO Box 217, 7500 AE, Enschede, The Netherlands.
J Colloid Interface Sci. 2011 Dec 15;364(2):530-8. doi: 10.1016/j.jcis.2011.08.039. Epub 2011 Aug 26.
Carbon nanofiber (CNF) layers have been directly synthesized on nickel foils by chemical vapor deposition at 450°C using different H(2) concentrations and reaction times. The addition of 5% H(2) produces thicker, rougher and more porous CNF layers than when 1% H(2) is used. The roughness and porosity increases with reaction time when 5%, 10% or 20% H(2) are used; however, this effect is less pronounced when 1% H(2) is used. CNFs are 50-55 nm in diameter and have a fishbone type structure. We have studied the influence of CNF layer thickness, porosity and surface roughness on the interaction with water by measuring the contact angle. The water wetting properties of the samples are more significantly influenced by the CNF layer thickness than both surface roughness and porosity. When the CNF layer is thicker than ca. 20 μm, the surface is hydrophobic and the contact angle increases with surface roughness and porosity. When the CNF layer is thinner than ca. 20 μm, the surface is hydrophilic and the contact angle decreases with increasing surface roughness and porosity. This behavior is attributed to penetration of water, making contact with the hydrophilic C layer between the CNF layer and the foil.
通过在 450°C 下使用不同的 H(2)浓度和反应时间，将化学气相沉积法直接在镍箔上合成了碳纳米纤维 (CNF) 层。与使用 1% H(2)相比，添加 5% H(2)会产生更厚、更粗糙和更多孔的 CNF 层。当使用 5%、10%或 20% H(2)时，粗糙度和孔隙率随反应时间增加而增加；然而，当使用 1% H(2)时，这种效果不太明显。CNF 的直径为 50-55nm，具有鱼骨型结构。我们通过测量接触角研究了 CNF 层厚度、孔隙率和表面粗糙度对与水相互作用的影响。样品的润湿性受 CNF 层厚度的影响比表面粗糙度和孔隙率更为显著。当 CNF 层厚度大于约 20μm 时，表面疏水性增加，接触角随表面粗糙度和孔隙率的增加而增加。当 CNF 层厚度小于约 20μm 时，表面亲水性增加，接触角随表面粗糙度和孔隙率的增加而减小。这种行为归因于水的渗透，使其与 CNF 层和箔之间的亲水 C 层接触。
