Energetics of ice nucleation in mesoporous titania using positron annihilation spectroscopy

Thangswamy, Muthulakshmi; Dutta, Dhanadeep; Maheshwari, P.; Sen, Debasis; Pujari, P. K.

doi:10.1039/c8cp06121a

Cited by 2 publications

(2 citation statements)

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“…But there are also other materials like metal oxides or porous glasses suitable for the investigation of ice melting point depression in confinement. 29,30 A quantitative analysis of the experimental data is usually done with the help of an adapted form of the Gibbs−Thomson equation…”

Section: Introductionmentioning

confidence: 99%

“…15 and 16). But there are also other materials like metal oxides or porous glasses suitable for the investigation of ice melting point depression in confinement. , A quantitative analysis of the experimental data is usually done with the help of an adapted form of the Gibbs–Thomson equation with where the ice melting point depression (Δ T m ), defined as the difference between the ice melting temperature in the pore [ T m (Π)] and the ice melting temperature of bulk ice at ambient conditions [ T m (0)], depends on the pore radius ( r pore ) . Here, Δ H̅ m , v̅ i , and γ sl are the molar enthalpy of ice melting, the molar volume of water in the ice phase, and the interface energy between solid and liquid water, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Phase Transitions of Ice in Aqueous Salt Solutions within Nanometer-Sized Pores

et al. 2019

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We examined the effect of CaCl2 and LiCl on ice melting in mesoporous silica (MCM-41 and SBA-15 silica). For that purpose, we determined the ice melting temperature in pores of various size (pore radii between 1.9 and 11.1 nm) in water and aqueous solutions up to high total solute molality (up to about 12 mol kg–1) using differential scanning calorimetry. We found that both electrolytes reduce the ice melting temperature within the pores. An exception is the melting of ice in the smallest pores, which does not seem to be affected by the presence of solutes, most likely owing to an exclusion of the ions from entering the pores. For all other pores, we observed that the ice melting temperature decreases as a function of pore size and electrolyte concentration. Using thermodynamic considerations as well as additional experimental data we developed a parametrization that can be used to predict the ice melting point as a function of pore size and total solute molality. For that purpose, we extended a formulation of the effective water activity of aqueous solutions under mechanical pressure toward its application in confinement and tested this new parametrization on literature data.

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Section: Introductionmentioning

confidence: 99%