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pH-dependent kinetics of MgCl2 adsorption under a fatty-acid Langmuir film

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Abstract.

The effect of subphase pH (5.5 and 10.5) on the structure of behenic-acid monolayers was investigated during Mg2+ adsorption by means of Grazing Incidence X-ray Diffraction (GIXD) and Brewster Angle Microscopy (BAM). The final phase corresponding to an ion superlattice commensurate to the behenic-acid cell is pH-independent. In contrast, the sequence of phases evidenced from the initial L2-phase to this final state presents at pH 10.5 an additional stage associated to a film condensation toward the L' 2-phase. The structures of the intermediate states preceding the superstructure nucleation are slightly different, both with a short-range fatty-acid order. Finally, a laser light effect that could result from visible light absorption by the inorganic complexes is evidenced in the final state as well as in the intermediate phases.

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Pignat, J., Cantin, S., Liu, R.C.W. et al. pH-dependent kinetics of MgCl2 adsorption under a fatty-acid Langmuir film. Eur. Phys. J. E 20, 387–394 (2006). https://doi.org/10.1140/epje/i2006-10027-y

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