Article (Scientific journals)
Alkylbetainate chlorides: Synthesis and behavior of monolayers at the air-water interface
Nsimba Zakanda, Francis; Laurent, Pascal; Paquot, Michel et al.
2011In Thin Solid Films, 520, p. 344-350
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Keywords :
Glycine betaine based ester; Cationic monolayer; Compression isotherm; Compressibility modulus
Abstract :
[en] In this study, cationic alkylbetainate chloride surfactants (CnBC, 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 CnBC monolayers is studied onto aqueous subphases at 20 °C using the Langmuir through technique. Different experimental conditions including pH, temperature, sodium salts and Na2SO4 ionic strength are investigated. The results obtained have shown that the CnBC with a hydrocarbon chain length ≥ 14 are able to form insoluble monolayers. The C16BC 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 C16BC 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.
Disciplines :
Chemistry
Author, co-author :
Nsimba Zakanda, Francis ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Laurent, Pascal ;  Université de Liège - ULiège > Chimie et bio-industries > Chimie biologique industrielle
Paquot, Michel ;  Université de Liège - ULiège > Chimie et bio-industries > Chimie biologique industrielle
Mvumbi, L. G.
Deleu, Magali  ;  Université de Liège - ULiège > Chimie et bio-industries > Chimie biologique industrielle
Language :
English
Title :
Alkylbetainate chlorides: Synthesis and behavior of monolayers at the air-water interface
Publication date :
2011
Journal title :
Thin Solid Films
ISSN :
0040-6090
Publisher :
Elsevier Science
Volume :
520
Pages :
344-350
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 24 November 2011

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