writer：Lirong Zheng, Zhuo Liu, Qiang Zhang*, Song Li, Juan Huang, Lei Zhang, Bing Zan, Madusudan Tyagi,
keywords：结合水，动力学，准弹性中子散射
source：期刊
specific source：Chemical Science DOI: 10.1039/d1sc04650k, 2022
Issue time：2022年

Interfacial water remains liquid and mobile much below 0
C, imparting flexibility to the encapsulated materials to ensure their diverse functions at subzero temperatures. However, a united picture that can describe the dynamical differences of interfacial water on different materials and its role in imparting system-specific flexibility to distinct materials is lacking. By combining neutron spectroscopy and isotope labeling, we explored the dynamics of water and the underlying substrates independently below 0
C across a broad range of materials. Surprisingly, while the function-related anharmonic dynamical onset in the materials exhibits diverse activation temperatures, the surface water presents a universal onset at a common temperature. Further analysis of the neutron experiment and simulation results revealed that the universal onset of water results from an intrinsic surface-independent relaxation: switching of hydrogen bonds between neighboring water molecules with a common energy barrier of 35 kJ mol