A MOLECULAR DYNAMICS SIMULATION STUDY OF Fe-CONTAINING PALYGORSKITE
ZJ Lu and JH Zhou and XC Lu, CLAYS AND CLAY MINERALS, 69, 399-405 (2021).
Fe is a common substituent in palygorskites (Plg), but its effect on the microscopic properties is unclear. In the current study, molecular dynamics (MD) simulations were carried out to investigate the effect of Fe on the properties of the nano-pores in Plg. The structures and dynamics of water and Na+ ions in the pores were computed by analyzing the MD trajectories. The results revealed that for both Fe-containing and ordinary Plg, zeolitic water molecules can diffuse into the pores with very low mobility whereas Mg-coordinated water fails to escape. Na+ ions show no obvious diffusivity because they are fixed above the Si- Osix-membered rings. Detailed comparison indicates that Fe-substitution has no significant influence on the pore properties of Plg.
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