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Inhibition of solute crystallisation in aqueous H+-NH4+-SO42--H2O droplets.

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dc.contributor.author Murray, Benjamin J.
dc.contributor.author Bertram, Allan K.
dc.date.accessioned 2011-04-18T21:56:13Z
dc.date.available 2011-04-18T21:56:13Z
dc.date.issued 2008-04
dc.identifier.citation Murray, Benjamin J., Bertram, Allan K. 2008. Inhibition of solute crystallisation in aqueous H+-NH4+-SO42--H2O droplets. Physical Chemistry Chemical Physics 10(22) 3287-3301. dx.doi.org/10.1039/b802216j en
dc.identifier.uri http://hdl.handle.net/2429/33773
dc.description.abstract Ice clouds in the Earth’s upper troposphere can form via homogeneous nucleation of ice in aqueous droplets. In this study we investigate the crystallisation, or lack of crystallisation, of the solute phase and ice in aqueous (NH4)3H(SO4)2/H2O and NH4HSO4/H2O droplets. This is done using in situ X-ray diffraction of emulsified solution droplets mounted on a cold stage. From the diffraction patterns we are able to identify the phases of crystalline solute and ice that form after homogeneous freezing in micrometer sized droplets. An important finding from this study is that crystallisation of the solute does not always occur, even when crystallisation is strongly thermodynamically favoured. The nucleation and growth of solute phase crystals becomes inhibited since the viscosity of the aqueous brine most likely increases dramatically as the brine concentration increases and temperature decreases. If ice nucleates below a threshold freezing temperature, the brine appears to rapidly become so viscous that solute crystallisation is inhibited. This threshold temperature is 192 K and 180 K, in (NH4)3H(SO4)2 and NH4HSO4, respectively. We also speculate that the formation of cubic ice within a highly viscous brine blocks the solvent mediated cubic to hexagonal phase transformation, thus stabilising the metastable cubic ice in the most concentrated solution droplets. en
dc.language.iso eng en
dc.publisher Royal Society of Chemistry en
dc.title Inhibition of solute crystallisation in aqueous H+-NH4+-SO42--H2O droplets. en
dc.type text en
dc.type.text article en
dc.description.affiliation Chemistry, Dept of en
dc.description.reviewstatus Reviewed en
dc.rights.copyright Bertram, Allen K. en
dc.description.scholarlevel Faculty en


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