Ca2+- and Mg2+-induced molecular interactions in a dehydrocholic acid/didodecyldimethylammonium bromide mixed monolayer
The aim of this article is the evaluation of Ca2+ and Mg 2+ subphases presence effect on mixed monolayers composed by dehydrocholic acid (HDHC) and didodecyldimethylammonium bromide (DDAB). The monolayer stability was analyzed by the evaluation of thermodynamic parameters, ΔGmix E and α. At all calc...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/64031 |
| Acceso en línea: | http://hdl.handle.net/11336/64031 |
| Access Level: | acceso abierto |
| Palabra clave: | Air-Solution Interface Bile Salts Divalent Cations Langmuir Monolayers Monolayer Stability https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | The aim of this article is the evaluation of Ca2+ and Mg 2+ subphases presence effect on mixed monolayers composed by dehydrocholic acid (HDHC) and didodecyldimethylammonium bromide (DDAB). The monolayer stability was analyzed by the evaluation of thermodynamic parameters, ΔGmix E and α. At all calcium ion-tested concentration, the mixed systems XHDHC=0.6 and 0.8 at π=30 mJ m-2 were always the most favored proportions. The X HDHC=0.6 system was also stable in magnesium presence, and the X HDHC=0.2-mixed monolayer went through a stable to an unstable state as the content of Ca2+ or Mg2+ augment. Finally, the XHDHC=0.4 monolayer showed a particular behavior, i.e., remained stable at low cation concentration, unstable at intermediate concentration and stable again at high concentration. The effect was similar at Mg2+ presence. © Springer-Verlag 2009. |
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