Autor(es):
Medronho, B. 
; Miguel, Maria G. ; Olsson, U.
Data: 2007
Identificador Persistente: http://hdl.handle.net/10316/10497
Origem: Estudo Geral - Universidade de Coimbra
Detalhes do Documento
Viscoelasticity of a Nonionic Lamellar Phase
Descrição
The linear viscoelastic properties of a nonionic lamellar phase in C-orientation were studied as a function of temperature by small-amplitude oscillatory measurements in the frequency range 0.5−5 Hz. An almost solidlike elastic response was observed at all studied temperatures, from 42 to 20 °C. In this range, the elastic modulus was found to increase strongly with decreasing temperature. The elasticity is attributed to screw dislocations connecting layers in the stack, and the data thus suggest that the density of screw dislocations decreases with increasing temperature. The lamellar phase forms an “onion” texture when continuously sheared at lower temperatures. It is argued that a possible origin for the shear-induced “onion” texture is the instability of the screw dislocations in shear flow. By 2H NMR experimentation, we also find the formation of a random mesh phase at lower temperatures. The presence of equilibrium bilayer perforations, however, does not correlate with the “onion” stability. http://dx.doi.org/10.1021/la063599a
The linear viscoelastic properties of a nonionic lamellar phase in C-orientation were studied as a function of temperature by small-amplitude oscillatory measurements in the frequency range 0.5−5 Hz. An almost solidlike elastic response was observed at all studied temperatures, from 42 to 20 °C. In this range, the elastic modulus was found to increase strongly with decreasing temperature. The elasticity is attributed to screw dislocations connecting layers in the stack, and the data thus suggest that the density of screw dislocations decreases with increasing temperature. The lamellar phase forms an “onion” texture when continuously sheared at lower temperatures. It is argued that a possible origin for the shear-induced “onion” texture is the instability of the screw dislocations in shear flow. By 2H NMR experimentation, we also find the formation of a random mesh phase at lower temperatures. The presence of equilibrium bilayer perforations, however, does not correlate with the “onion” stability. http://dx.doi.org/10.1021/la063599a
Tipo de Documento
Artigo
Idioma Inglês
Idioma Inglês
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