화학공학소재연구정보센터
Journal of Rheology, Vol.42, No.2, 417-432, 1998
Rheological behavior of a lamellar lyotropic phase as a function of the substrate nature
Various rheological experiments were carried out on a lamellar phase system in order to analyze its structural organization using different geometries. The results showed a rheological behavior which depended on the chemical nature of the geometry. For stainless steel substrates, the rheological profile presented a liquid plastic behavior with a predominantly elastic character for low stresses. In the case of quartz, the rheological behavior was different, displaying a predominantly viscous and shear-thinning character. A detailed rheological analysis allowed us to conclude that there exists an inhomogeneous shear effect of the sample on quartz, probably induced by a local alignment effect of the lamellar layers in the vicinity of the quartz plates. X-ray analysis of the lamellar sample placed on either stainless steel or quartz showed a parallel alignment of the lamellar layers. However, on quartz substrates, this orientation was almost perfect in the vicinity of the plates and more marked than that observed on stainless steel substrates.