Paradoxical transformation of the equilibrium quartz-water system into an unequilibrated one

Alexeyev, V. A.; Medvedeva, L. S.; Starshinova, N. P.

doi:10.1134/s0016702913050029

Cited by 8 publications

(3 citation statements)

References 69 publications

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“…In previous paper [1], we have revealed in some long-term runs at 300°C the transformation of thermodynamic equilibrium quartz-water system into non-equilibrium one whereas in other runs such transformation was not observed. Some hypotheses were proposed to explain this unusual silica behavior and estimations of their reliability were made.…”

Section: Introductionmentioning

confidence: 78%

“…Positive TG is the initial reason of silica separation but we want to know mechanism of this process. In previous paper [1], we proposed that this mechanism was the predominant evaporation of water at the meniscus edge [5]. Now we suppose that a more probable mechanism can be thermal diffusion (Soret effect) providing additional silica flux upwards owing to temperature gradient [6].…”

Section: Discussionmentioning

confidence: 99%

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Disturbance of Thermodynamic Equilibrium of the Quartz-Water System and Silica Separation from the Liquid Phase at a Small Temperature Gradient

Alekseyev

Medvedeva

2013

Procedia Earth and Planetary Science

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In electric furnaces destined for experimental geochemical investigations, a small temperature gradient (TG) always exists, and it is difficult to avoid it. In our electric furnaces (from bottom to top) the temperature rises in the lower part (TG = 0.25 °/cm) and falls in the upper part (TG = -0.16 °/cm). Long-term runs with quartz and water at 300°C have shown the attainment of equilibrium at TG equal to -0.16 °/cm. At TG equal to 0.25 °/cm, the silica reprecipitated from the ampoule bottom onto its walls above the meniscus, and the aqueous silica concentration was reduced and became 300 times lower than quartz solubility. The obtained results were explained by the combined action of slow convection of water and thermal diffusion of silica. The efficient mechanism of fractionation revealed by us can be extended to other substances and has geochemical and technological importance.

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Section: Introductionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Disturbance of Thermodynamic Equilibrium of the Quartz-Water System and Silica Separation from the Liquid Phase at a Small Temperature Gradient

Alekseyev

Medvedeva

2013

Procedia Earth and Planetary Science

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“…Few studies in the past have demonstrated deviations in expected spreading behavior even before the contact lines encounter surface irregularities due to the presence of precursor lms. [21][22][23][24] The deposition studies by Bormashenko 25 and Alexeyev et al 26 have demonstrated the deposition of sodium chloride and silica particles, respectively, beyond the three-phase contact line. The experimental study by Marmur and Lelah 23 has shown that the spreading rate of a water droplet on a glass slide was affected by the edges of the solid surface and attributed it to the interaction of precursor lm with edges.…”

Section: Introductionmentioning

confidence: 99%

Precursor film: a key driver to determine wetting behavior in the vicinity of surface heterogeneity

Sah

2014

Soft Matter

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Experimental findings in the recent past have clearly emphasized the role of the three-phase contact line in determining the wetting behavior of liquids. However, at a microscopic level when the precursor film precedes the contact line, the role of thin film in wetting behavior becomes important. The current study presents a series of simple experiments to establish the role of precursor films in controlling the wetting behavior in the context of rising liquids in vertical planes. The experiments have been performed on glass capillaries and cover slips which have been rendered partially hydrophobic by silanisation of some portion. Thus, two regions of significantly different wetting behavior have been created. Experiments have been performed to capture the changes in wetting behavior as manifested by variation in capillary rise height and Wilhelmy force values, where hydrophilic and hydrophobic regions meet each other. The deviations in expected wetting behavior as the liquid approaches the boundary between the two regions from the hydrophilic end have demonstrated the role of precursor films in wetting behavior.

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Spontaneous Solution Distillation in a Closed Silica-Water System at the Water–Vapor Interface: Review of Experimental Studies

Alekseyev

2023

Advances in Geochemistry, Analytical Chemistry, and Planetary Sciences

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Paradoxical transformation of the equilibrium quartz-water system into an unequilibrated one

Cited by 8 publications

References 69 publications

Disturbance of Thermodynamic Equilibrium of the Quartz-Water System and Silica Separation from the Liquid Phase at a Small Temperature Gradient

Disturbance of Thermodynamic Equilibrium of the Quartz-Water System and Silica Separation from the Liquid Phase at a Small Temperature Gradient

Precursor film: a key driver to determine wetting behavior in the vicinity of surface heterogeneity

Spontaneous Solution Distillation in a Closed Silica-Water System at the Water–Vapor Interface: Review of Experimental Studies

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