Line thermodynamics: adsorption at a membrane edge.
We report a novel experimental study of line thermodynamics. Our system consists of detergent molecules adsorbing at the edges of freestanding lipid bilayers. Adsorption reduces the line tension T of the membrane edges. Measuring T as a function of the bulk detergent concentration C, we obtain a line adsorption isotherm. Using an extension of Gibbs's surface thermodynamics to lines, we estimate the "line excess density" of adsorbants and the energy of adsorption per site.
Puech
P-H
PH
Laboratoire PCC/UMR 168, Institut Curie, 11 rue P. & M. Curie, 75005 Paris, France.
Borghi
N
N
Karatekin
E
E
Brochard-Wyart
F
F
D000327:Adsorption; D003902:Detergents / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry; D008051:Lipid Bilayers / Q000737:chemistry*; D008567:Membranes, Artificial; D008856:Microscopy, Fluorescence; D010713:Phosphatidylcholines / Q000737:chemistry; D012995:Solubility; D013501:Surface-Active Agents / Q000737:chemistry; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
D003902:Detergents; D008051:Lipid Bilayers; D008567:Membranes, Artificial; D010713:Phosphatidylcholines; D013501:Surface-Active Agents; D014867:Water; C017251:1,2-oleoylphosphatidylcholine; D005990:Glycerol