Influence of ice formation on the dynamic and thermodynamic properties of aqueous solutions

Melillo, Jorge H.; Swenson, Jan; Cerveny, Silvina

doi:10.1016/j.molliq.2022.119039

Cited by 5 publications

(4 citation statements)

References 60 publications

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“…The inset in Figure 10a corresponds to the total heat capacity (c P ). As seen in Figure 10a, the nRc P signal for MIP_11 is flat, indicating no crystallization during the heating scan (the so-called coldcrystallization 72 ) until the temperature reaches 220 K. At 220 K, a small endothermic broad peak starts related to melting.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

The Nature of the Low-Temperature Crossover of Water in Hard Confinement

et al. 2023

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The dynamics of water confined in mesoporous MIP (2–3 nm pores in size) with silica gel (secondary silica; further, the abbreviation SG will be used) and MAP (10–35 nm pores in size) without SG borosilicate glasses have been studied by broadband dielectric spectroscopy (BDS), nuclear magnetic resonance (NMR), and differential scanning calorimetry (DSC). MIP samples contain secondary silica inside the pores and provide a confinement size of about 2–3 nm, whereas MAP samples are free of secondary silica and provide a confinement size of about 10–35 nm. It is shown by BDS and NMR techniques that water exhibits a dynamic crossover of around 180 K when it is confined in MIP samples. By contrast, water confined in larger pores (MAP) does not exhibit any changes in its relaxation behavior. It is also shown that the crossover temperature depends on the hydration level (the higher the hydration level, the lower the crossover temperature). Below the crossover temperature, we find that water reorientation is isotropic (NMR) and that the temperature-dependent dielectric relaxation strength (BDS) follows the tendency expected for a solid-like material. In contrast, water reorientation is related to long-range diffusion above the crossover temperature, and the dielectric relaxation strength follows the tendency expected for a liquid-like material. Furthermore, the calorimetric results are compatible with crossing a glass transition near 180 K. Finally, the results are discussed within the Gibbs–Thomson model. In this framework, the crossover could be related to ice crystals melting.

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Section: Differential Scanning Calorimetrymentioning

confidence: 99%

The Nature of the Low-Temperature Crossover of Water in Hard Confinement

et al. 2023

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“…9 presents a comparison of the dynamics of water in fly ash blended paste (P145) in equilibrium at 97 % and 33 % RH, together with data of bulk ice relaxation from Refs. [79,80] for comparison and a better understanding of the different types of water in hcp. R3 in hcp is close to the dynamics of ice in tri-propylene glycol solution [80].…”

Section: Referencesmentioning

confidence: 99%

“…[79,80] for comparison and a better understanding of the different types of water in hcp. R3 in hcp is close to the dynamics of ice in tri-propylene glycol solution [80]. At low temperatures, the ice is also occupying a large volume of the pores in hcp at a RH of 97 %, so R3 may also include the relaxation of crystalline ice.…”

Section: Referencesmentioning

confidence: 99%