Optical coherence tomography velocimetry of colloidal suspensions.

Optical coherence tomography velocimetry of colloidal suspensions.
复制标题

胶体悬浮液的光学相干断层扫描测速。

DOI:
10.1039/c4sm01111b
复制
发表时间:
2014
期刊:
影响因子:
3.4
通讯作者:
Malm AV
Malm AV
中科院分区:
化学2区
文献类型:
--
作者:
Malm AV

文献摘要

参考文献

被引文献

相似文献

光学相干断层扫描测速技术与流变仪和光学调制技术相结合,提高了对复杂流体系统的低剪切速率运动的灵敏度。光学调制与新型干涉仪设计相结合,可提高信噪比,并通过光学不透明胶体悬浮液进行了演示。因此,复杂流体剪切速度的可测量范围可以低至~40 μm s−1,比之前的下限~700 μm s−1 提高了一个数量级以上。此外,该装置表现出对速度测量的更高的灵敏度。该仪器用于研究两种硬球胶体系统,即半径为 1 μm 的空间稳定 PVP 球体和半径为 600 nm 的空间稳定聚苯乙烯球体,它们由于剪切引起的浓度梯度而表现出剪切带行为。 OCT 测速还可以将系统的速度波动量化为流变仪间隙距离的函数,以帮助对潜在的不稳定或湍流现象进行分类。
Optical coherence tomography velocimetry combined with a rheometer and optical modulation techniques provides increased sensitivity to the low shear rate motion of complex fluid systems. Optical modulation coupled with a new interferometer design yields improved signal to noise ratios and is demonstrated with optically opaque colloidal suspensions. Thus the measurable range of shear velocities with complex fluids can be as low as ∼40 μm s−1, more than an order of magnitude improvement on the previous lower limit of ∼700 μm s−1. Furthermore the apparatus demonstrates improved sensitivity to the measurement of velocity. The instrument was used to study two hard sphere colloidal systems, sterically stabilized PVP spheres of 1 μm radius and sterically stabilized polystyrene spheres of 600 nm radius, which display shear banding behavior due to shear induced concentration gradients. OCT velocimetry also allows the velocity fluctuations of the system to be quantified as a function of the distance across the rheometer gap to help classify underlying unsteady or turbulent phenomena.
受控剪切流中的光学相干断层扫描测速。
DOI: 10.1103/physreve.83.031502
发表时间: 2011
期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子: --
作者:
Harvey M
通讯作者: Harvey M
DOI: 10.1039/c2sm26395e
发表时间: 2012-11
期刊: Soft Matter
影响因子: 3.4
作者:
Shaden Jaradat;M. Harvey;T. Waigh
通讯作者: Shaden Jaradat;M. Harvey;T. Waigh
DOI: 10.1007/12_2009_38
发表时间: 2009
期刊: The European Physical Journal Special Topics
影响因子: --
作者:
L. Isa;R. Besseling;A. Schofield;W. Poon
通讯作者: W. Poon
DOI: --
发表时间: 1995
期刊:
影响因子: --
作者:
David L. Wagner;T. Walkiewicz;D. Giltinan
通讯作者: D. Giltinan
使用体光学迈克尔逊干涉仪的激光多普勒测速:学生实验室实验
DOI: --
发表时间: 1993
期刊:
影响因子: --
作者:
Richard Belansky;K. Wanser
通讯作者: K. Wanser