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Universal dynamical onset in water at distinct material interfaces
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DOI：10.1039/d1sc04650k.png)
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Abstract
En 中文
Interfacial water remains liquid and mobile much below 0 degrees 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 degrees 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 similar to 35 kJ mol(-1).
Keywords:
HYDRATION-WATER
PROTEIN DYNAMICS
NEUTRON-SCATTERING
MOLECULAR-MECHANISM
TRANSFER-RNA
TRANSITION
SPECTROMETER
TEMPERATURE
KINETICS
ICE
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