Shear Induced Structures in Lamellar Systems : From Layers to Onions to Onions and Layers(Non Equilibrium Soft Matter)

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概要

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• Shear flow induces the formation of multilamellar vesicles (MLV, also termed "onions") in the lamellar phase of the nonionic surfactant C_<10>E_3 in water. Depending on the applied shear rate, one can reach a state of polydisperse MLV (at intermediate shear rates) or densely packed monodisperse MLV at high shear rates. In this contribution we investigated the structure evolution when the shear rate is reduced by means of rheo-microscopy as well as rheo-small angle light and neutron scattering (SALS, SANS). Different shear quenches within the MLV structure region of 40wt% C_<10>E_3 reveal two different MLV size growth mechanisms: (i) a continuous and (ii) a discontinuous MLV size growth. In the later case, a part of the initial MLV structure transforms into planar lamellar domains leading to shear thinning. The lamellar domains perform a re-orientation process from parallel oriented lamellae into MLV in coexistence with the initial MLV structure. The pathway of the transformation of the parallel lamellae to MLV is the same as in start-up experiments, i.e. from a homeotropically aligned lamellar phase.

• 理論物理学刊行会の論文
• 2008-12-05

著者

• Richtering Walter

  Institute Of Physical Chemistry Rwth Aachen University

• Richtering Walter

  Institut Fur Makromolekulare Chemie Universitat Freiburg

• Fujii Shuji

  Department Of Chemistry Nagaoka University Of Technology

• KOSCHORECK Sven

  Institute of Physical Chemistry, RWTH Aachen University

• Koschoreck Sven

  Institute Of Physical Chemistry Rwth Aachen University

• Fujii Shuji

  Department of Chemistry, Nagaoka University of Technology

関連論文

• Structural Aspect of Gelation in Schizophyllan/Sorbitol Aqueous Solution
• Shear Induced Structures in Lamellar Systems : From Layers to Onions to Onions and Layers(Non Equilibrium Soft Matter)

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