Nonlinear Rheology of Bicontinuous Bilayer Systems

点击翻译按钮获取中文摘要

Dynamic light scattering measurement after shearing the lamellar/sponge coexisting phase reveals that the connected membranes in the lamellar phase significantly influence the viscoelastic behavior of the lamellar phase.Viscoelasticity of vesicle phase made of DMPG lipid systems shows a significant hysteresis in heating and cooling cycle. This temperature dependence can be attributed to the deformability of vesicles. It is found that the highly deformable vesicle shows the shear-thickening behavior, which indicates non-equilibrium phase transition.We designed a diffusive wave spectroscopy apparatus equipped with shear cell. Our apparatus allows measuring the microrheology of non-equilibrium phase induced by shear. We also tried to achieve the microrheology measurement via the dynamic light scattering. Unfortunately, we found that the mircrorheology via the DLS is not yet applicable for the viscoelastic materials because of the appearance of the wavelength dependence of the mean square distance of the probe particle.