Adsorption of multilamellar tubes with a temperature tunable diameter at the air/water interface

作者：Fameau Anne Laure; Douliez Jean Paul; Boue Francois; Ott Frederic; Cousin Fabrice^*

来源：Journal of Colloid and Interface Science, 2011, 362(2): 397-405.

DOI：10.1016/j.jcis.2011.06.080

• Hydroxy fatty acid
• Multilamellar tubes
• Air/water interface
• Neutron Reflectivity

The ethanolamine salt of 12-hydroxy stearic acid is known to form tubes having a temperature tunable diameter. Here, we study the behavior of those tubes at the air/water interface by using Neutron Reflectivity. We observed that tubes indeed adsorbed at this interface below a fatty acid monolayer and exhibit the same temperature behavior as in bulk. There is however a peculiar behavior at around 50 C for which the increase of the diameter of the tubes at the interface yields an unfolding of those tubes into a multilamellar layer. Upon further heating, the tubes re-fold and their diameter re-decreases after which they melt into micelles as observed in the bulk. All structural transitions at the interface are nevertheless reversible. This provides to the system a high interest for its interfacial properties because the structure at the air/water interface can be tuned easily by the temperature.

• 出版日期2011-10-15
• 单位中国地震局