Inhomogeneous structure formation and shear-thickening in worm-like micellar solutions
Inhomogeneous structure formation and shear-thickening in worm-like micellar solutions
复制标题
蠕虫状胶束溶液中的不均匀结构形成和剪切增稠
DOI：
10.1209/epl/i1997-00256-8
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
D. Pine
中科院分区：
文献类型：
--
作者：
P. Boltenhagen;Yuntao Hu;E. Matthys;D. Pine
采用直接可视化和流变学方法研究了低浓度蠕虫状胶束溶液中流动诱导结构的时间演化。可视化测量显示了一个新的粘性剪切诱导相（SIP）的增长开始在一个库埃特剪切单元的内壁上的时间t1剪切流开始后。SIP继续在剪切单元上生长，直到它在时间t2填充整个间隙。流变学测量表明，时间t1对应于应力增加的诱导时间，t2对应于应力饱和的平台时间。这些测量结果提供了令人信服的证据表明，应力随时间的增加的结果从一个新的剪切诱导相在流动池中的不均匀生长。新相在整个细胞中的生长在时间上近似线性。
The time evolution of flow-induced structures in low-concentration worm-like micellar solutions is studied using direct visualization and rheological methods. The visualization measurements show growth of a new viscous shear-induced phase (SIP) starting on the inner wall of a Couette shear cell at a time t1 after the commencement of shear flow. The SIP continues to grow across the shear cell until it fills the entire gap at a time t2. Rheological measurements show that the time t1 corresponds to the induction time for the increase in stress and that t2 corresponds to the plateau time for the saturation of stress. These measurements provide convincing evidence that the increase of stress with time results from the inhomogeneous growth of a new shear-induced phase in the flow cell. The growth of the new phase across the cell is approximately linear in time.