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Significance Statement
– This paper introduces the ‘hydration stress tensor’ applied to the hydration layer which acts an exponential-decay force on the hydrated surfaces.
– The hydration stress tensor indicates the relation between shear mechanism and tapping mechanism (attached Figure) which have studied individually.
– The relation between them offers the compressibility of the hydration.
– It also shows the stiffness and damping of the hydration layer related to a hydration force.
– Moreover, we expect that the ‘viscoelastic hydration force model’ which is the base of the tensor plays an important role in damping and energy dissipation process by the hydration water layer.
– This paper provides the distinct and unified understanding to various mechanical properties in hydration water layer.
Journal Reference
Phys. Rev. Lett. 111, 246102 – 13 December 2013.
Bongsu Kim, QHwan Kim, Soyoung Kwon, Sangmin An, Kunyoung Lee, Manhee Lee, and Wonho Jhe.
Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Seoul 151-747, Republic of Korea
Abstract
We present the general stress tensor of the ubiquitous hydration water layer (HWL), based on the empirical hydration force, by combining the elasticity and hydrodynamics theories. The tapping and shear component of the tensor describe the elastic and damping properties of the HWL, respectively, in good agreement with experiments. In particular, a unified understanding of HWL dynamics provides the otherwise unavailable intrinsic parameters of the HWL, which offer additional but unexplored aspects to the supercooled liquidity of the confined HWL. Our results may allow deeper insight on systems where the HWL is critical.
