Alkylbetainate chlorides: Synthesis and behavior of monolayers at the air-water interface

作者：Zakanda F Nsimba; Laurent P; Paquot M; Lelo G Mvumbi; Deleu M^*

来源：Thin Solid Films, 2011, 520(1): 344-350.

DOI：10.1016/j.tsf.2011.07.005

• Glycine betaine based ester
• Cationic monolayer
• Compression isotherm
• Compressibility modulus

In this study, cationic alkylbetainate chloride surfactants (C(n)BC, n=10-16) are synthesized using more environment-friendly reagents (glycine betaine, thionyl chloride and primary alcohols) than in previous works (chloroacetyl chloride, trimethylamine and primary alcohols). The interfacial behavior of the C(n)BC monolayers is studied onto aqueous subphases at 20 degrees C using the Langmuir through technique. Different experimental conditions including pH, temperature, sodium salts and Na(2)SO(4) ionic strength are investigated. The results obtained have shown that the C(n)BC with a hydrocarbon chain length >= 14 are able to form insoluble monolayers. The C(16)BC monolayer stability checked by the compression-expansion cycles has shown a superimposition of isotherms in the whole liquid-condensed region and an irreversible rearrangement of the molecules at high compression. The C(16)BC monolayer is not influenced by the pH and the presence of monovalent anions but it is influenced by the temperature, the divalent anions and the ionic strength. It has exhibited a great stability whatever the experimental conditions.

• 出版日期2011-10-31