caa a22 4500 475764595 CHVBK 20180406123601.0 cr unu---uuuuu 170329e20000801xx s 000 0 eng 10.1007/s003960000334 doi (NATIONALLICENCE)springer-10.1007/s003960000334 Phospholipid foam films studied by contact angle measurements and fluorescence microscopy [Elektronische Daten] [J. L. Toca-Herrera, R. Krustev, H.-J. Müller, H. Möhwald]  Foam films drawn from suspensions of the phospholipid 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC) in water/ethanol mixtures were used for the investigation of the relation between the properties of the monolayers and the interaction between the film surfaces. The film thickness and the contact angle between the film and the meniscus were measured as a function of the temperature in a range around the temperature of the main phase transition for the lipid. Additionally, fluorescence microscopy was applied to investigate the distribution of a fluorescent lipidlike dye in the surface of the film and the meniscus. From the contact angle the free energy of film formation was calculated. At the temperature of the chain-melting phase transition the film thickness decreases by 0.7 nm. This can be related to a decrease in the thickness of the hydrocarbon layers of the lipid monolayers at this temperature. The decrease in the film thickness leads to a reduction in the free energy by increasing the van der Waals attraction between the film surfaces. No structures were observed in the monolayers of the film in the fluorescence investigation. However, on formation of the very thin equilibrium film the dye was expelled from the film area, indicating an increase in the packing density of the lipid, if the monolayers are in adhesive contact in the film. Springer-Verlag Berlin Heidelberg, 2000 Key words Black foam films nationallicence Contact angle nationallicence Film thickness nationallicence DMPC nationallicence Fluorescence microscopy nationallicence Toca-Herrera J. L. Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut Krustev R. Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut Müller H.-J Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut Möhwald H. Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut https://doi.org/10.1007/s003960000334 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000334 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Toca-Herrera J. L. Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut NATIONALLICENCE 700 1- Krustev R. Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut NATIONALLICENCE 700 1- Müller H.-J Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut NATIONALLICENCE 700 1- Möhwald H. Max-Planck-Institut für Kolloid-und Grenzflächenforschung Am Mühlenberg 1, 14476 Golm, Germany e-mail: hj.mueller@mpikg-golm.mpg.de Tel.: +49-331-5679232 Fax: +49-331-5679202, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer