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Solid or liquid? Solidification of a nanoconfined liquid under nonequilibrium conditions
Shivprasad Patil1, George Matei, Ahmet Oral
1Department of Physics and Astronomy, Wayne State University, 666 West Hancock, Detroit, MI 48201, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 13, 2006
Summary
Confined liquids do not solidify due to thermodynamic equilibrium. Instead, kinetic solidification occurs when confining surfaces approach at a critical rate, explaining observed phenomena.
Area of Science:
- Physics
- Physical Chemistry
Background:
- The physical state and phase transformations of confined liquids are subjects of ongoing scientific debate.
- Understanding liquid behavior under confinement is crucial for various scientific and industrial applications.
Purpose of the Study:
- To investigate the physical state and phase transformations of a model-confined liquid.
- To determine the conditions under which confinement-induced solidification occurs.
Main Methods:
- Simulations of a model-confined liquid subjected to varying rates of confining surface approach.
- Analysis of liquid dynamics and phase behavior as a function of approach rate.
Main Results:
- A model-confined liquid exhibits Newtonian liquid behavior or pseudosolid behavior based on the rate of surface approach.
- Confinement-induced solidification is not observed in thermodynamic equilibrium.
- Solidification is kinetically induced at a critical approach rate of approximately 6 Å/s.
Conclusions:
- The observed "solidification" of confined liquids is a kinetic phenomenon, not a thermodynamic phase transition.
- A slow critical rate of surface approach explains frequent observations of confinement-induced solidification.
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