Supercooled confined water and the Mode Coupling crossover temperature

Details Supercooled confined water and the Mode Coupling crossover temperature Supercooled confined water and the Mode Coupling crossover temperature

2000-02-29

arxiv.org/abs/cond-mat/0002456v2

Phys. Rev. Lett. Vol.85, p.4317 (2000)

Physics

Condensed Matter

Statistical Mechanics

To be published, Phys. Rev. Lett., 4 pages, 3 figures, revTeX, minor changes in the figures, references added, changes in the

Scientific paper

10.1103/PhysRevLett.85.4317

We present a Molecular Dynamics study of the single particle dynamics of supercooled water confined in a silica pore. Two dynamical regimes are found: close to the hydrophilic substrate molecules are below the Mode Coupling crossover temperature, $T_C$, already at ambient temperature. The water closer to the center of the pore (free water) approaches upon supercooling $T_C$ as predicted by Mode Coupling Theories. For free water the crossover temperature and crossover exponent $\gamma$ are extracted from power-law fits to both the diffusion coefficient and the relaxation time of the late $\alpha$ region.

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