Mean thickness and thickness distribution of smectite crystallites

Mystkowski, K.; Środoń, J.; Elsass, Françoise

doi:10.1180/000985500547016

Cited by 47 publications

(48 citation statements)

References 16 publications

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“…Using transmission electron microscopy, scanning electron microscopy, SAXS and X-ray diffraction experiments 64,[66][67][68][69] on different types of Na-smectites have found that particles typically comprise three to ten layers of platelets, consistent with our numerical simulations.…”

supporting

confidence: 72%

Mesoscale properties of clay aggregates from potential of mean force representation of interactions between nanoplatelets

Ebrahimi¹,

Whittle²,

Pellenq³

2014

The Journal of Chemical Physics

112

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Face-to-face and edge-to-edge free energy interactions of Wyoming Na-montmorillonite platelets were studied by calculating potential of mean force along their center to center reaction coordinate using explicit solvent (i.e., water) molecular dynamics and free energy perturbation methods. Using a series of configurations, the Gay-Berne potential was parametrized and used to examine the meso-scale aggregation and properties of platelets that are initially random oriented under isothermal-isobaric condition.Aggregates of clay was defined by geometrical analysis of face-to-face proximity of platelets with size distribution described by a log-normal function. The isotropy of the microstructure was assessed by computing a scalar order parameter. The number of platelets per aggregate and anisotropy of the microstructure both increases with platelet plan area. System becomes more ordered and aggregate size increases with increasing pressure until maximum ordered state. Further increase of pressure slides platelets relative to each other leading to smaller aggregate size. The geometrical arrangement of aggregates affects mechanical properties of the system. The elastic properties of the meso-scale aggregate assembly are reported. It is found that the elastic properties at this scale are close to the cubic systems. The elastic stiffness and 1 anisotropy of the assembly increases with the size of the platelets and the level of external pressure.

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supporting

confidence: 72%

Mesoscale properties of clay aggregates from potential of mean force representation of interactions between nanoplatelets

Ebrahimi¹,

Whittle²,

Pellenq³

2014

The Journal of Chemical Physics

112

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“…Coherent scattering domain sizes are commonly used to analyze the size of crystallites [46,[53][54][55]. There is a cumulative index of physical-chemical activity of the most clay minerals which have correlations with specific surface area and adsorption characteristics.…”

Section: Transformation Of Montmorillonite Adsorption Properties Undementioning

confidence: 99%

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

et al. 2017

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This paper discusses the mechanism of montmorillonite structural alteration and modification of bentonites' properties (based on samples from clay deposits Taganskoye, Kazakhstan and Mukhortala, Buriatia) under thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). Treatment conditions were chosen according to those accepted in chemical industry for obtaining acid modified clays as catalysts or sorbents. Also, more intense treatment was carried out to simulate possible influence at the liquid radioactive site repositories. A series of methods was used: XRD, FTIR, ICP-AES, TEM, nitrogen adsorption, and particle size analysis. It allowed revealing certain processes: transformation of montmorillonite structure which appears in the leaching of interlayer and octahedral cations and protonation of the interlayer and -OH groups at octahedral sheets. In turn, changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant alterations in the properties: reduction of cation exchange capacity and an increase of specific surface area. Acid treatment also leads to a redistribution of particle sizes and changes the pore system. The results of the work showed that bentonite clays retain a significant portion of their adsorption properties even after a prolonged and intense thermochemical treatment (1 M HNO 3 , 60 • C, 108 h).

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“…Coherent scattering domain sizes are commonly used to analyze the size of crystallites [16,23,24,25]. There is a cumulative index of physical-chemical activity of the most clay minerals which have correlations with specific surface area and adsorption characteristics.…”

Section: Transformation Of Montmorillonite Adsorption Properties Undementioning

confidence: 99%

Experimental Study of Montmorillonite Structure and Transformation of its Properties under the Treatment of Inorganic Acid Solutions

Krupskaya

Закусин

Tyupina

et al. 2016

Preprint

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Abstract:The paper discusses the mechanism of montmorillonite structure alteration and bentonites properties modification (on the example of samples from clay deposit Taganka, Kazakhstan) due to the thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). With the use of the suit of methods certain processes were distinguished: transformation of montmorillonite structure, which appears in the leaching of interlayer and octahedral cations, protonation of the interlayer and OH groups at octahedral sheets. Changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant changes in the properties -reduction of cation exchange capacity and an increase of specific surface area. The results of the work showed that bentonite clays retain a significant portion of its adsorption properties even after the long term and intense thermochemical treatment (6M HNO3, 60°C, 108 hours)

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Mean thickness and thickness distribution of smectite crystallites

Cited by 47 publications

References 16 publications

Mesoscale properties of clay aggregates from potential of mean force representation of interactions between nanoplatelets

Mesoscale properties of clay aggregates from potential of mean force representation of interactions between nanoplatelets

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

Experimental Study of Montmorillonite Structure and Transformation of its Properties under the Treatment of Inorganic Acid Solutions

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