Supercooled nano-droplets of water confined in hydrophobic rubber - Archive ouverte HAL
Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2021

Supercooled nano-droplets of water confined in hydrophobic rubber

Résumé

Hydrophobic elastomers are capable of absorbing a small amount of water that forms droplets around hydrophilic sites. These systems allow the study of confinement effects by a hydrophobic environment on the dynamics and thermodynamic behaviour of water molecules. The freezing–melting properties and the dynamics of water inside nano-droplets in butyl rubber are affected, as revealed by differential scanning calorimetry (DSC) and deuterium nuclear magnetic resonance (2H-NMR). Upon cooling down, all water crystalizes with a bimodal droplet population (da = 3.4 nm and db = 4.4 nm) in a temperature range associated with the droplet size distribution. However, the melting temperature is not shifted according to the Gibbs–Thomson equation. The relative decrease of the 2H-NMR longitudinal magnetization is not a single exponential and, by inverse Laplace transformation, it was deduced to be bimodal in agreement with the DSC measurements (T1,a ∼ 10 ms and T1,b ∼ 200 ms). The deduced correlation time of molecular reorientation is longer than that of bulk water and the behaviour with temperature follows the Vogel-Fulcher-Tammann (VFT) equations with a changing fragility as the droplet size is reduced when reducing hydration.
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Dates et versions

hal-03760667 , version 1 (25-08-2022)

Identifiants

Citer

R. Neffati, P. Judeinstein, J. Rault. Supercooled nano-droplets of water confined in hydrophobic rubber. Physical Chemistry Chemical Physics, 2021, 23 (44), pp.25347-25355. ⟨10.1039/D1CP03774A⟩. ⟨hal-03760667⟩
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