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。
作者:
Malm AV
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.
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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
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
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
Richard Belansky;K. Wanser
通讯作者:
K. Wanser