Energy dissipation of nanoconfined hydration layer: long-range hydration on the hydrophilic solid surface.

ABSTRACT: The hydration water layer (HWL), a ubiquitous form of water on the hydrophilic surfaces, exhibits anomalous characteristics different from bulk water and plays an important role in interfacial interactions. Despite extensive studies on the mechanical properties of HWL, one still lacks holistic understanding of its energy dissipation, which is critical to characterization of viscoelastic materials as well as identification of nanoscale dissipation processes. Here we address energy dissipation of nanoconfined HWL between two atomically flat hydrophilic solid surfaces (area of ~120 nm(2)) by small amplitude-modulation, noncontact atomic force microscopy. Based on the viscoelastic hydration-force model, the average dissipation energy is ~1 eV at the tapping amplitude (~0.1 nm) of the tip. In p

SUBMITTER: Kim B 

PROVIDER: S-EPMC4179125 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature