期刊
CHEMICAL SCIENCE
卷 13, 期 15, 页码 4341-4351出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc04650k
关键词
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资金
- National Natural Science Foundation of China [11504231, 21873101, 31630002, 22063007, U1932161]
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-02-E00076]
- FJIRSM&IUE Joint Research Fund [RHZX-2019-002]
- Natural Science Foundation of Inner Mongolia [2020MS02018]
- Scienti.c Research Foundation of IMUN for doctors [BS581]
- National Science Foundation [DMR2010792]
- Materials and Life Science Experimental Facility (MLF) of the J-PARC [2018A0291, 2019A0020, 2019A0010]
This study reveals that the onset temperature of surface water is universal, despite the diverse activation temperatures of function-related anharmonic dynamics in different materials. This universal onset results from the switching of hydrogen bonds between neighboring water molecules with a common energy barrier of approximately 35 kJ mol(-1).
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).
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