Seven years of measurement of the surface tension of supercooled water and aqueous mixtures at IT CAS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F18%3A00493156" target="_blank" >RIV/61388998:_____/18:00493156 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Seven years of measurement of the surface tension of supercooled water and aqueous mixtures at IT CAS

Popis výsledku v původním jazyce

The contribution presents an overview of more than half a decade research of our team focused on the experimental investigation of the surface tension of water and aqueous mixtures under the metastable supercooled conditions, i.e. at temperatures below the equilibrium freezing temperature. The surface tension of supercooled water was successfully measured with two different measuring techniques both using fused silica capillary tubes with diameter of around 0.3 mm. In the first case, a modified capillary rise technique allowed measurements down to -26 °C [1,2]. The second method, similar to that employed by P.T. Hacker [3], whose data showed a potential anomaly at temperatures below -8 °C [4], used a horizontal capillary tube [5]. The data obtained with both methods agree with each other and can relatively well be correlated with the IAPWS standard [6] extrapolated below the triple point temperature. The new data were recently used by Pátek et al. [7] in the development of a new correlation for the surface tension of water valid from -26 °C up to the critical point, which is being revised as a potential replacement of the IAPWS standard. In 2017, the experimental apparatus was modified for the measurements of aqueous mixtures using a capillary rise method [8]. The setup was tested on the measurements of aqueous mixtures with lower alcohols [8] and sodium chloride. Currently, new data for the surface tension of supercooled seawater are being measured. The preliminary data show promising agreement with the correlation by Nayar et al. [9] within the stable temperature region from 0 °C to 30 °C. The new measurements are most probably going to be considered in the development of the new IAPWS standard for the surface tension of seawater, whose validity might be extended also in the metastable supercooled region.

Název v anglickém jazyce

Seven years of measurement of the surface tension of supercooled water and aqueous mixtures at IT CAS

Popis výsledku anglicky

The contribution presents an overview of more than half a decade research of our team focused on the experimental investigation of the surface tension of water and aqueous mixtures under the metastable supercooled conditions, i.e. at temperatures below the equilibrium freezing temperature. The surface tension of supercooled water was successfully measured with two different measuring techniques both using fused silica capillary tubes with diameter of around 0.3 mm. In the first case, a modified capillary rise technique allowed measurements down to -26 °C [1,2]. The second method, similar to that employed by P.T. Hacker [3], whose data showed a potential anomaly at temperatures below -8 °C [4], used a horizontal capillary tube [5]. The data obtained with both methods agree with each other and can relatively well be correlated with the IAPWS standard [6] extrapolated below the triple point temperature. The new data were recently used by Pátek et al. [7] in the development of a new correlation for the surface tension of water valid from -26 °C up to the critical point, which is being revised as a potential replacement of the IAPWS standard. In 2017, the experimental apparatus was modified for the measurements of aqueous mixtures using a capillary rise method [8]. The setup was tested on the measurements of aqueous mixtures with lower alcohols [8] and sodium chloride. Currently, new data for the surface tension of supercooled seawater are being measured. The preliminary data show promising agreement with the correlation by Nayar et al. [9] within the stable temperature region from 0 °C to 30 °C. The new measurements are most probably going to be considered in the development of the new IAPWS standard for the surface tension of seawater, whose validity might be extended also in the metastable supercooled region.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/GA16-02647S" target="_blank" >GA16-02647S: Vlastnosti vody a mořské vody v metastabilních stavech. Experiment, molekulární simulace a termodynamické modelování.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů