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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Dynamic solidification in nanoconfined water films.

Shah H Khan¹, George Matei, Shivprasad Patil

¹Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA.

Physical Review Letters

|September 28, 2010

Summary

This summary is machine-generated.

The mechanical properties of nanoconfined water change with its dynamic state. Even at slow rates, water films transition from viscous to elastic when compressed to just a few molecular layers.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Area of Science:

Physics
Materials Science
Physical Chemistry

Background:

Understanding nanoconfined water is crucial for biology and nanotechnology.
Mechanical properties of ultra-thin water films remain poorly understood and debated.

Purpose of the Study:

To investigate the dynamic nanomechanical properties of water films compressed to a few molecular layers.
To determine how compression affects water's mechanical response.

Main Methods:

Dynamic nanomechanical measurements were performed on water films.
Water films were compressed to single molecular layer thicknesses.

Main Results:

Mechanical properties showed significant changes with the dynamic state of nanoconfined water.
A sharp transition from viscous to elastic behavior was observed.
This transition occurred even at extremely slow compression rates.

Conclusions:

Mechanical relaxation times increase dramatically as water is confined to less than 3-4 molecular layers.
The dynamic state is a critical factor in the mechanical response of nanoconfined water.