Terahertz time-domain spectroscopy of nanoadditive macroscale superlubricity: Quantitative hydration investigation and deeper insight into the solid-liquid synergistic lubrication

YQ Gu and S Yi and Q Xu and J Zhang and JJ Li and TB Ma and JB Luo, TRIBOLOGY INTERNATIONAL, 195, 109634 (2024).

DOI: 10.1016/j.triboint.2024.109634

As a promising approach, terahertz time -domain spectroscopy (THz-TDs) provides the powerful assistance for quantitatively characterizing the solid -liquid synergistic lubrication. The hydration ratio in nanoadditive solutions was calculated by terahertz dielectric spectrum, and the exact threshold for superlubricity was found as 40%. The high hydration ratio also promoted the formation of high -quality tribofilm. Besides, not all hydrogen bonds, but the solid -liquid hydrogen bond was the true answer to the nanoadditive superlubricity. Finally, a synergistic lubrication model was proposed and it gave a detailed description of the molecular states with different lubrication. This work exerts the sensitivity of THz-TDs on hydration and liquid lubrication, providing avenues for the quick assessment of superlubricity and optimal design of nanoadditive superlubricity in the future.

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