Ultrahigh Lubricity between Two-Dimensional Ice and Two-Dimensional Atomic Layers.
basic_science · Level V
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- Record sourced from PubMed, PMID 36763496.
- Also identified by DOI 10.1021/acs.nanolett.2c04573.
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Abstract
Low temperature and high humidity conditions significantly degrade the performance of solid-state lubricants consisting of van der Waals (vdW) atomic layers, owing to the liquid water layer attached/intercalated to the vdW layers, which greatly enhances the interlayer friction. However, using low temperature <i>in situ</i> atomic force microscopy (AFM) and friction force microscopy (FFM), we unveil the unexpected ultralow friction between two-dimensional (2D) ice, a solid phase of water confined to the 2D space, and the 2D molybdenum disulfides (MoS<sub>2</sub>). The friction of MoS<sub>2</sub> and 2D ice is reduced by more than 30% as compared to bare MoS<sub>2</sub> and the rigid surface. The phase transition of liquid water into 2D ice under mechanical compression has also been observed. These new findings can be applied as novel frictionless water/ice transport technology in nanofluidic systems and promising high performance lubricants for operating in low temperature and high humidity environments.