The thermal behavior of unsonicated dispersions of a double-chained surfactant, Dioctadecyldimethylammonium bromide (DODAB), has been studied over a wide concentration range using DSC and dynamic rheology. All dispersions are characterized by the pre-and main transition peaks at 35 degrees C and 43 degrees C, respectively. But, only above 10 mM DODAB, a third endotherm at 52 degrees C appears which may correspond to the (ULVs + L-alpha fragments) -> MLVs transition. The thermal-induced MLV's size is proportionally dependent on the concentration. In addition, and in agreement with DSC data, dynamic rheology has proven to be an indirect way to elucidate the structural transitions in these DODAB vesicular dispersions. (C) 2009 Elsevier Inc. All rights reserved.

Rheological investigation of thermal transitions in vesicular dispersion

Gentile L.
2009

Abstract

The thermal behavior of unsonicated dispersions of a double-chained surfactant, Dioctadecyldimethylammonium bromide (DODAB), has been studied over a wide concentration range using DSC and dynamic rheology. All dispersions are characterized by the pre-and main transition peaks at 35 degrees C and 43 degrees C, respectively. But, only above 10 mM DODAB, a third endotherm at 52 degrees C appears which may correspond to the (ULVs + L-alpha fragments) -> MLVs transition. The thermal-induced MLV's size is proportionally dependent on the concentration. In addition, and in agreement with DSC data, dynamic rheology has proven to be an indirect way to elucidate the structural transitions in these DODAB vesicular dispersions. (C) 2009 Elsevier Inc. All rights reserved.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/249765
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 13
social impact