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'Phase transitions' in keywords Facet   Publication Year 1978  [X]
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1978[X]
1Author    H. Heithier, H.-J Galla, H. MöhwaldRequires cookie*
 Title    Fluorescence Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles. Part I: Mixed Monolayers of Pheophytin A and Lecithin  
 Abstract    Mixed monolayers of pheophytin a and a-L-dimyristoyl lecithin (DML) are investigated on the water surface. The studies gain their special value from the simultaneous measurement of surface pressure and fluorescence intensity as a function of the covered area per molecule. A phase separation in the liquid state of the monolayer is established. Phase 1 exists almost exclusively of pheophytin molecules. Phase 2 exists essentially of D M L domains solubilizing pheo­ phytin in a concentration of 15 mol%. During the D M L main transition the pheophytin solubility decreases to about 2 mol%, the excess pheophytin being precipitated within the surface layer. During the pheophytin main transition an ordered structure below the surface layer is formed. A stabilizing interaction between the pheophytin domains and their environment is observed and discussed. A sharp fluorescence change at a pressure below 0.5 dyn/cm indicates another phase transition. It very probably involves an unwrapping of pheophytin from water molecules. 
  Reference    Z. Naturforsch. 33c, 382 (1978); received March 15/April 3 1978 
  Published    1978 
  Keywords    Monolayers, Chlorophyll, Energy Transfer, Fluorescence Spectroscopy, Phase Transitions 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0382.pdf 
 Identifier    ZNC-1978-33c-0382 
 Volume    33