Department of Chemical & Environmental Engineering, Yale University , New Haven, Connecticut 06520-8286, United States.
Department of Chemistry, Yale University , New Haven, Connecticut 06520-8107, United States.
J Am Chem Soc. 2018 Feb 7;140(5):1824-1833. doi: 10.1021/jacs.7b11654. Epub 2018 Jan 23.
A new class of hydrophobic CuO nanosheets is introduced by functionalization of the cupric oxide surface with p-xylene, toluene, hexane, methylcyclohexane, and chlorobenzene. The resulting nanosheets exhibit a wide range of contact angles from 146° (p-xylene) to 27° (chlorobenzene) due to significant changes in surface composition induced by functionalization, as revealed by XPS and ATR-FTIR spectroscopies and computational modeling. Aromatic adsorbates are stable even up to 250-350 °C since they covalently bind to the surface as alkoxides, upon reaction with the surface as shown by DFT calculations and FTIR and H NMR spectroscopy. The resulting hydrophobicity correlates with H temperature-programmed reduction (H-TPR) stability, which therefore provides a practical gauge of hydrophobicity.
通过用对二甲苯、甲苯、己烷、甲基环己烷和氯苯对氧化铜表面进行功能化，引入了一类新的疏水氧化铜纳米片。由于表面组成的显著变化，导致所得纳米片的接触角范围很广，从 146°（对二甲苯）到 27°（氯苯），这一点通过 XPS、ATR-FTIR 光谱和计算建模得到了揭示。芳香族吸附剂非常稳定，即使在 250-350°C 下也是如此，因为它们作为烷氧基与表面反应，通过 DFT 计算和 FTIR 以及 H NMR 光谱证明它们以共价键的形式结合在表面上。所得疏水性与 H 程序升温还原（H-TPR）稳定性相关，因此提供了一种实用的疏水性衡量标准。
