Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/7258
Título: Viscoelasticity of a nonionic lamellar phase
Autor: Medronho, B.
Miguel, M. G.
Olsson, U.
Data: 2007
Editora: American Chemical Society
Resumo: 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 degrees 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 H-2 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.
Peer review: yes
URI: http://hdl.handle.net/10400.1/7258
DOI: https://dx.doi.org/10.1021/la063599a
ISSN: 0743-7463
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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