Observed-Predicted Shifts in Thermodynamic Functions of Water Adsorption by Smectite at Nanoscale

Elprince, Adel M.; Saffan, Mohamed M.; Zabidi, Mohammed

doi:10.2136/sssaj2015.03.0096

Cited by 1 publication

(1 citation statement)

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“…Phyllosilicate nanoparticles are also associated with higher surface areas than their bulk counterparts, but laboratory experiments suggest that smectite nanoparticles bind H 2 O more strongly than bulk smectite. As this bound H 2 O desorbs, the nanoparticles aggregate and coarsen, in turn, reducing the total surface area (Elprince et al, 2015). The kinetics of this reaction are not well characterized, but on analogy to other nanoparticle systems, dehydration may occur over the course of weeks to months under typical laboratory conditions.…”

Section: Poorly Crystalline and X-ray Amorphous Materialsmentioning

confidence: 99%

Time-Sensitive Aspects of Mars Sample Return (MSR) Science

et al. 2022

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List of Findings 1. Introduction 1.1 Scope of the report 2. Time-Sensitivity of MSR Investigations: Background 3. Time-Sensitivity of MSR Investigations: Rationale 4. Time-Sensitive Processes and Their Characteristic Timescales 4.1 Degradation of organic material (including volatile compounds) 4.2 Modification of sample headspace gas composition 4.3 Mineral-volatile exchange 4.3.1 Hydrous sulfate minerals 4.3.2 Poorly crystalline and X-ray amorphous materials 4.3.3 Phyllosilicate minerals 4.3.4 Hydrous carbonate minerals 4.4 Oxidation/reduction of redox-sensitive minerals 5. Estimating the Loss of Scientific Information as a Function of Time: Implications for Sample Handling and Curation Workflow within an SRF 6. Recommendations for SRF Sample Processing and Analytical Capabilities 6.1 Goal 1: Characterize sample tube headspace gas composition

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Section: Poorly Crystalline and X-ray Amorphous Materialsmentioning

confidence: 99%