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The European Physical Journal E

, Volume 20, Issue 4, pp 387–394 | Cite as

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

  • J. Pignat
  • S. Cantin
  • R. C. W. Liu
  • M. Goldmann
  • P. Fontaine
  • J. Daillant
  • F. Perrot
Regular Article

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.

PACS.

68.18.-g Langmuir-Blodgett films on liquids 61.10.Nz X-ray diffraction 68.18.Jk Phase transitions 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • J. Pignat
    • 1
    • 4
  • S. Cantin
    • 1
  • R. C. W. Liu
    • 1
  • M. Goldmann
    • 2
  • P. Fontaine
    • 3
  • J. Daillant
    • 4
  • F. Perrot
    • 1
  1. 1.LPPIUniversité de Cergy-PontoiseCergy-Pontoise CedexFrance
  2. 2.Campus BoucicautInstitut des Nanosciences de ParisParisFrance
  3. 3.Synchrotron SoleilGif-sur-Yvette CedexFrance
  4. 4.Service de Chimie Moléculaire/LIONSCEA-SaclayGif-sur-YvetteFrance

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