Particle Size Controls on Water Adsorption and Condensation Regimes at Mineral Surfaces

Yeşilbaş, Merve; Boily, Jean-François

doi:10.1038/srep32136

Cited by 58 publications

(94 citation statements)

References 62 publications

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“…Such processes are closely related to the particle size of the mineral substrate. Recently, it has been stated that in particular, micron-sized particles (with a specific surface area of less than~10 m 2 /g) should tend to be more capable of promoting such water condensation than submicron-sized particles [31].…”

Section: Discussionmentioning

confidence: 99%

Reactivity of Gypsum-Based Materials Subjected to Thermal Load: Investigation of Reaction Mechanisms

Krause

Renner

Coppens³

et al. 2020

Materials

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The thermal stability of gypsum-based materials, and in this context, especially their long-term behavior, is the background of our current research activities. A comprehensive investigation program was compiled in which detailed examinations of various model materials exposed to thermal loads were carried out. The understanding of the partly not entirely consistent state of knowledge shall be sharpened especially by in situ observations of the thermally induced conversion reaction of gypsum into hemihydrate. The temporal course of the reaction was investigated non-destructively by in situ investigations in a high-resolution X-ray computed tomography setup, and the experiment was accompanied by detailed characterizations of the microstructure and composition. In this contribution, selected results of experiments with a high-purity natural gypsum rock as the model substance are presented. Studying the influence of temperature on the reaction showed that, even under supposedly dry conditions, the reaction could take place at much lower temperatures than usually reported in the literature. It was demonstrated that the transformation of gypsum into hemihydrate could take place at a temperature of already 50 °C. The results indicated that even under “classical” heating conditions in a conventional oven, the dissolution and crystallization processes in water films on the mineral surfaces could be suggested to be a driving force for the reaction. A corresponding reaction model, which took these aspects into account, was proposed in this work.

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Section: Discussionmentioning

confidence: 99%

Reactivity of Gypsum-Based Materials Subjected to Thermal Load: Investigation of Reaction Mechanisms

Krause

Renner

Coppens³

et al. 2020

Materials

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“…The secondary minerals under rock‐dominated conditions (Table ) formed by condensation of liquid water on the micronized basalt allowing aqueous mineral dissolution‐precipitation processes at very low water:rock ratios (Yeşilbaş and Boily ). The observed mineralogy in rock‐ and fluid‐dominated conditions was comparable.…”

Section: Discussionmentioning

confidence: 99%

Experimental hydrothermal alteration of basaltic glass with relevance to Mars

Sætre

Hellevang

Riu

et al. 2018

Meteorit & Planetary Scien

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Phyllosilicates, carbonates, zeolites, and sulfates on Mars give clues about the planet's past environmental conditions, but little is known about the specific conditions in which these minerals formed within the crust and at the surface. The aim of the present study was to gain increased understanding on the formation of secondary phases by hydrothermal alteration of basaltic glass. The reaction processes were studied under varying conditions (temperature, pCO2, water:rock ratio, and fluid composition) with relevance to aqueous hydrothermal alteration in fully and partly saturated Martian basalt deposits. Analyses made on reaction products using X‐ray diffraction (XRD) and scanning electron microscope (SEM) were compared with near infrared spectroscopy (NIR) to establish relative detectability and spectral signatures. This study demonstrates that comparable alteration minerals (phyllosilicates, carbonates, zeolites) form from vapor condensing on mineral surfaces in unsaturated sediments and not only in fully water‐saturated sediments. In certain environments where water vapor might be present, it can alter the basaltic bedrock to a suite of authigenic phases similar to those observed on the Martian surface. For the detection of the secondary phases, XRD and SEM‐EDS were found to be superior to NIR for detecting and characterizing zeolites. The discrepancy in detectability of zeolites between NIR and XRD/SEM‐EDS might indicate that zeolites on Mars are more abundant than previously thought.

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“…Recent work has shown that particle size controls the condensation of water and the formation of water films (Yeşilbaş & Boily, ). How the thickness of the water film, interactions between the soil particle surface, mobile, immobile water, and water vapour combine to control the isotopic environment is not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Possible soil tension controls on the isotopic equilibrium fractionation factor for evaporation from soil

Gaj

McDonnell

2019

Hydrological Processes

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The stable isotopes of hydrogen and oxygen (δ 2 H and δ 18 O) are useful conservative tracers for tracking the movement of water in soil. But although the tracking of water infiltrating through the soil profile and its movement as run-off and groundwater recharge are well developed, water movement through the soil can also include evaporative fractionation. Soil water fractionation factors have, until now, been largely empirical. Unlike open water evaporation where temperature, humidity, and vapour pressure gradient define fractionation, soil water evaporation includes fractionation by soil matrix effects. These effects are still poorly characterized. Here, we present preliminary results from a simple laboratory experiment with four soil admixtures with grain sizes that range from sand to silt and clay. Our results show that soil tension seems to control the isotope fractionation of resident soil water. The relationship between soil tension and equilibrium fractionation appears to be independent of soil texture and appears well supported by thermodynamic theory. Although these results are preliminary, they suggest that future work should go after soil tension effects as a possible explanatory factor of soil water and water vapour fractionation.

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Particle Size Controls on Water Adsorption and Condensation Regimes at Mineral Surfaces

Cited by 58 publications

References 62 publications

Reactivity of Gypsum-Based Materials Subjected to Thermal Load: Investigation of Reaction Mechanisms

Reactivity of Gypsum-Based Materials Subjected to Thermal Load: Investigation of Reaction Mechanisms

Experimental hydrothermal alteration of basaltic glass with relevance to Mars

Possible soil tension controls on the isotopic equilibrium fractionation factor for evaporation from soil

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