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Updated: May 9, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Cooperative dynamic and diffusion behavior above and below the dynamical crossover of supercooled water
Germán C Picasso1, David C Malaspina, Marcelo A Carignano
1Department of Biomedical Engineering, Chemistry of Life Processes Institute, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
Abstract:
Using extensive molecular dynamics simulations combined with a novel approach to analyze the molecular displacements we analyzed the change in the dynamics above and below the crossover temperature T(x) for supercooled water. Our findings suggest that the crossover from fragile to strong glass former occurring at T(x) is related with a change in the diffusion mechanism evidencing the presence of jump-like diffusion at lower temperatures. Also we observe that fluctuations of the local environments are intimately connected with fluctuations in the size and the amount of cooperative cluster of mobile molecules, and in particular we find a highly cooperative nature of the motion at low temperatures.
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