We report the rapid single-step flame synthesis of hydrophobic carbon layers (C-layers) on the surface of stainless-steel (SS) substrates using vaporized biodiesel as the fuel. A co-flow canola methyl ester/air diffusion flame is used to generate a hydrophobic monolayer on the surface of the metal substrate upon its insertion into the reaction zone. Carbon deposition on the surface of the SS substrates varies by changing the SS disk’s position in the post-flame, and by varying its exposure time. The thickness and mass of the flame-formed monolayer varied depending on the substrate’s insertion point into the flame. However, the variation of mass did not significantly impact the C-layer’s uniformity or hydrophobicity. We hypothesize that a small “inner-cone” of the biodiesel flame along with a high soot propensity can result in an ideal medium to form uniform hydrophobic C-layers of unique hierarchical surface structure. This is supported by introducing SS substrates in methane/air flames formed using the same co-flow burner. The hydrophobic property of the carbon deposits was quantified by measuring the contact angle of water droplets placed on the film’s surface. A water droplet drop test was conducted on the flame-formed hydrophobic layers to study their wettability property.

我们报告了使用气化生物柴油作为燃料在不锈钢（SS）基材表面上快速疏水碳层（C层）的单步火焰合成。当将其插入反应区时，使用同流低芥酸菜子甲酯/空气扩散火焰在金属基材的表面上产生疏水单层。通过改变SS盘在火焰后的位置并改变其暴露时间，可以改变SS基板表面上的碳沉积。火焰形成的单层的厚度和质量取决于基材在火焰中的插入点而变化。然而，质量的变化并没有显着影响C层的均匀性或疏水性。我们假设生物柴油火焰的小“内锥”和高烟灰倾向会导致理想的介质形成具有独特层次结构的均匀疏水性C层。通过将SS基板引入使用相同的并流燃烧器形成的甲烷/空气火焰中，可以实现这一点。通过测量放置在薄膜表面上的水滴的接触角来量化碳沉积物的疏水性。在火焰形成的疏水层上进行了水滴试验，以研究其润湿性。通过测量放置在薄膜表面上的水滴的接触角来量化碳沉积物的疏水性。在火焰形成的疏水层上进行了水滴试验，以研究其润湿性。通过测量放置在薄膜表面上的水滴的接触角来量化碳沉积物的疏水性。在火焰形成的疏水层上进行了水滴试验，以研究其润湿性。