Self-aggregation of hydrophobically modified dextrin and their interaction with surfactant

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Guangyue Bai (Autor) Outra; Catarina Goncalves (Autor) Outra; Francisco M Gama (Autor) Outra; Margarida Bastos (Autor) FCUP

Revista

Título: Thermochimica Acta

Vol. 467

Páginas: 54-62

ISSN: 0040-6031

Editora: Elsevier

Indexação

ISI Web of Knowledge - 17 Citações

Scopus - 19 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-004-200

DOI: 10.1016/j.tca.2007.11.006

Abstract (EN): A series of newly hydrophobically modified polymers (dexC(16)) with different degrees of substitution (DSC16) have been synthesized. They can self-assemble to form micelle-like aggregates through association of the hydrophobic alkyl chains in aqueous solution. The self-aggregation processes, i.e. the critical micelle concentrations (cmc's) of the polymers were characterized by steady-state fluorescence. Further, the interaction between these dexC(16) polymers and ionic surfactants (SOS, SDS and DTAC) was investigated by isothermal titration calorimetry (ITC). For the studied mixed systems some important parameters can be derived from calorimetric titration curves, such as interaction enthalpies, critical concentrations and enthalpies of aggregation. The critical concentrations and the aggregation behaviour for the dexC(16)/SDS system were confirmed by fluorescence measurements. The effects of hydrophobic side group concentrations on the interaction were evaluated in detail. Importantly, we show that the aggregation behaviour of the mixed systems depends on the molar ratio of surfactant to hydrophobic side group (R=n(s)/n(side) (group)).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9