PHASE SEPARATION AND DOMAIN INTERACTION IN PHEOPHYTIN CONTAINING MONOLAYERSReportar como inadecuado




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Abstract : Surface pressure and fluorescence intensity of pheophytin containing lipid-monolayers are measured simultaneously at the air-water interface. A phase separation into two distinct phases is reported. Phase 1 exists of pheophytin domains whereas phase 2 is a lipid domain containing pheophytin in molar content between 2 % and 15 %, depending on the state of the lipid. The transition of the pheophytin domains is described within a model explaining correctly the observed concentration dependence of the transition pressure πk. The analysis shows that the pheophytin domains are two-dimensional and of limited size smaller than 1 000 molecules. The domains are stabilized by their environment by steric forces. The change of the interactions during the phase transition is calculated. It amounts to 0.6 x 10-13 erg per molecule in the bulk of the domain and to 1.2 x 10-13 erg per molecule at the domain wall.





Autor: H. Heithier H.-J. Galla H. Möhwald

Fuente: https://hal.archives-ouvertes.fr/



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