Rheochaos and flow instability phenomena in a nonionic lamellar phase
Rheochaos and flow instability phenomena in a nonionic lamellar phase
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DOI：
10.1039/c2sm27101j
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发表时间：
2013-01-01
期刊：
影响因子：
3.4
通讯作者：
Olsson, Ulf
中科院分区：
文献类型：
--
作者：
Gentile, Luigi;Silva, Bruno F. B.;Olsson, Ulf
在这项研究中，我们报告的不稳定现象的溶液中，剪切诱导多层囊泡（MLV）从层状相。在40 ℃下，十六烷基四甘醇醚（C16 E4）溶解于D2 O中，观察到剪切增稠机制。在这种状态下，在2、5和10 s（-1）下观察到不稳定的时间粘度行为，即周期性振荡。此外，在10 s（-1）的剪切速率下，剪切带本身表现为沿着涡度方向堆叠的透明和混浊带的出现。我们进行时间分辨流变小角中子散射（流变SANS）实验，以了解粘度振荡和空间分辨实验的性质，以获得涡度带的结构表征。
In this study we report on instability phenomena in a solution where shear induces multilamellar vesicles (MLVs) from a lamellar phase. A shear-thickening regime has been observed for hexadecyl tetraethylene glycol ether (C16E4) dissolved in D2O at 40 degrees C. In this regime, unstable temporal viscosity behavior, i.e. periodic oscillations, has been observed at 2, 5 and 10 s(-1). Moreover at a shear rate of 10 s(-1) shear banding manifests itself as the occurrence of transparent and turbid bands stacked along the vorticity direction. We perform time-resolved-rheo-small angle neutron scattering (rheo-SANS) experiments to understand the nature of the viscosity oscillations and spatial-resolved experiments to obtain a structural characterization of vorticity bands.