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- Title
pH-dependent kinetics of MgCl<sub>2</sub> adsorption under a fatty-acid Langmuir film.
- Authors
Pignat, J.; Cantin, S.; Liu, R. C. W.; Goldmann, M.; Fontaine, P.; Daillant, J.; Perrot, F.
- 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.
- Subjects
GRAZING incidence; X-ray diffraction; MULTILAYERED thin films; SUPERLATTICES; ADSORPTION (Chemistry)
- Publication
European Physical Journal E -- Soft Matter, 2006, Vol 20, Issue 4, p387
- ISSN
1292-8941
- Publication type
Article
- DOI
10.1140/epje/i2006-10027-y