论文标题
通过少量阳离子在石墨表面上增强了盐水溶液的接触角滞后
Enhanced contact angle hysteresis of salt aqueous solution on graphite surface by a tiny amount of cation
论文作者
论文摘要
我们在实验上观察到了石墨表面上稀释盐溶液的增强接触角滞后（CAH），即40.6 $^\ circ $，34.6 $^\ circ $，以及27.8 $^\ circ $，用于licl，nacl和kcl，表示有效调谐CAH，表明cahs cahs cations cations cahs cahs的有效调谐。分子动力学模拟表明，由于阳离子-π相互作用将水固定在后向后液体 - 固体界面上的阳离子表面上的优先吸附，从而减少了回收的接触角，从而增强了CAH。这一发现提供了一种简单的方法，可以控制石墨烯，碳纳米管，生物分子和空气污染物等石墨表面上水滴的CAH。
We experimentally observed the enhanced contact angle hysteresis (CAH) of dilute aqueous salt solution on graphite surface, i.e., 40.6$^\circ$, 34.6$^\circ$, and 27.8$^\circ$, for LiCl, NaCl, and KCl, indicating the effective tuning of the CAHs by cations. Molecular dynamics simulations reveal that the preferential adsorption of cations on the HOPG surface due to the cation-π interaction pins the water at the backward liquid-gas-solid interfaces, reducing the receding contact angle and hence enhancing the CAH. This finding provides a simple method to control the contact angle and the CAH of aqueous drops on graphitic surfaces such as graphene, carbon nanotube, biomolecules, and airborne pollutants.
