Shear orientation of a lamellar lyotropic liquid crystal |
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Authors: | Jörg Lauger Reinhard Linemann Dr Walter Richtering |
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Institution: | (1) Institut Für Makromolekulare Chemie Und Freiburger Materialforschungszentrum, Albert-Ludwigs-Universitat Freiburg, Stefan-Meier-Straße 31, 79104 Freiburg, Germany |
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Abstract: | Shear orientation of a lyotropic lamellar liquid crystalline phase of tetra ethyleneglycol mono dodecylether, C12A4 in water was studied by combined rheo-small-angle light scattering. Shear thinning was observed with a sample of 500 m thickness. The scattering patterns showed that domains were aligned and stretched in flow direction. Shear thinning was also observed with a thinner sample, but caused a strong change in light-scattering pattern. A maximum of scattering intensity was observed at finite scattering vector and shifted to a higher scattering vector with increasing shear stress. This observation can be explained by a fragmentation of domains at high shear stress and is supported by a mosaic texture observed in optical microscopy. |
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Keywords: | Lyotropic lamellar phase shear orientation rheo-small-angle light scattering nonionic surfactant liquid crystal |
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