A slippery surface can reduce drag, resist dirt buildup, or prevent ice formation. Traditionally, researchers have looked to water-repelling materials to increase slip, but Tuan Ann Ho et al. (pp. 16170-16175) found that some water-loving, or hydrophilic, surfaces can be slippery, too. The authors-used computer simulations to model interactions between droplets of 1,000 water molecules and three solid surfaces. Unexpectedly, the researchers found that liquid slip can occur on a hydrophilic surface as long as water-to-solid attractions are not too strong and the sites that attract the water are closely spaced. Under these conditions, water can travel along the solid's surface by migrating from one adsorption site to the next, the researchers report. The authors modeled the spacing of adsorption sites by increasing or decreasing the distance between atoms of a simple MgO surface.
展开▼
机译：光滑的表面可减少阻力，防止灰尘积聚或防止结冰。传统上，研究人员一直在寻找防水材料来增加滑移率，但Tuan Ann Ho等人（2002年）。 （pp。16170-16175）发现，某些防水或亲水性表面也可能很滑。作者使用计算机模拟来模拟1,000个水分子的液滴与三个固体表面之间的相互作用。出乎意料的是，研究人员发现，只要水与固体之间的吸引力不太强并且吸引水的位置间隔很近，就会在亲水性表面上发生液滑。研究人员报告说，在这些条件下，水可以从一个吸附位置迁移到另一个吸附位置，从而沿着固体表面流动。作者通过增加或减少简单MgO表面原子之间的距离来模拟吸附位点的间距。
展开▼
