Through a refined fabrication protocol based on block-copolymer self-assembly we synthesize nanostructured surfaces with conical nanopillars of different height (60, 120, and 200 nm) in hexagonal arrays with uniform spacing ($\sim$50 nm) over large areas ($>$ cm${}^2$). While the nanostructured surfaces fabricated on silicon substrates display superhydrophilic behavior, superhydrophobic properties are attained by coating with octadecyltrichlorosilane (OTS). Negative zeta potentials for all the studied surfaces are reported by electrokinetic flow measurements with aqueous KCl solutions at different concentrations (1 and 10 mM) and pH values between 4 and 8. While the surface nanostructure reduces the zeta potential magnitude, the hydrophobic OTS coating enhances it. Experimental results can be accounted for by a site-dissociation model for the surface charge density. The reported wetting properties and zeta potential tunability makes the studied surfaces particularly relevant for applications such as energy conversion and storage, membrane-based water treatment and molecular separation.

通过基于嵌段共聚物自组装的精细制造方案，我们合成了具有不同高度（60、120和200 nm）的圆锥形纳米柱的纳米结构表面，这些圆锥形柱体的间距均匀（$〜$50海里）$>$ 厘米${}^2$）。虽然在硅基板上制造的纳米结构表面表现出超亲水性能，但通过涂覆十八烷基三氯硅烷（OTS）可获得超疏水性能。通过用不同浓度（1和10 mM）和pH值在4和8之间的KCl水溶液进行电动流动测量，报告了所有研究表面的负zeta电位。虽然表面纳米结构降低了zeta电位幅度，但疏水性OTS涂层增强了它。实验结果可以由表面电荷密度的位解离模型解释。报道的润湿特性和Zeta电位可调性使研究的表面特别适用于诸如能量转换和存储，基于膜的水处理和分子分离等应用。