Rheology of globular proteins: apparent yield stress, high shear rate viscosity and interfacial viscoelasticity of bovine serum albumin solutions

Soft Matter ◽  
2011 ◽  
Vol 7 (11) ◽  
pp. 5150 ◽  
Author(s):  
Vivek Sharma ◽  
Aditya Jaishankar ◽  
Ying-Chih Wang ◽  
Gareth H. McKinley
Keyword(s):  
Shear Rate ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Yield Stress ◽  
Bovine Serum ◽  
Globular Proteins ◽  
High Shear Rate ◽  
High Shear

scholarly journals Concentration dependence of translational diffusion coefficients for globular proteins

The Analyst ◽  
2014 ◽  
Vol 139 (23) ◽  
pp. 6242-6248 ◽  
Author(s):  
David J. Scott ◽  
Stephen E. Harding ◽  
Donald J. Winzor
Keyword(s):  
Diffusion Coefficient ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Diffusion Coefficients ◽  
Bovine Serum ◽  
Globular Proteins ◽  
Sedimentation Velocity ◽  
Translational Diffusion ◽  
Translational Diffusion Coefficient ◽  
Reasonable Approximation

This investigation examines published results of traditional diffusion experiments on ovalbumin and bovine serum albumin to determine the extent to which assumed concentration independence of the translational diffusion coefficient is a reasonable approximation in the analysis of boundary spreading in sedimentation velocity experiments on proteins.

BEHAVIOR OF MR FLUIDS AT HIGH SHEAR RATE

2011 ◽  
Vol 25 (07) ◽  
pp. 979-985 ◽  
Author(s):  
WEI HU ◽  
NORMAN M. WERELEY
Keyword(s):  
Shear Rate ◽  
Yield Stress ◽  
High Shear Rate ◽  
Field Analysis ◽  
Flow Mode ◽  
High Shear ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Magnetic Filed ◽  
Cylinder Viscometer

The high shear rate behavior of MR fluids is investigated using a concentric rotational cylinder viscometer fabricated in-house. The rotational cylinder viscometer is designed such that a high shear rate of up to 30,000 s-1 can be applied to the MR fluid in a pure shear flow mode. As a comparison, the maximum shear rate of a commercially available parallel disk type rheometer is only up to 1,000 s-1. To determine the shear rate of the MR fluid in the viscometer, an exact expression between torque and angular velocity is established. The yield stress and viscosity of the MR fluid is determined by fitting the expression into the measured torque and angular velocities, and the shear stress as a function of the shear rate is further derived. The magnetic filed strength across the fluid gap is determined based on an electromagnetic field analysis, and the yield stress and viscosity of the fluid as a function of the magnetic filed is established. Specifically, the stability of the MR fluid at high shear rate is also evaluated. Two commercially available MR fluids, i.e., Lord's MRF-132DG and MRF-140CG, are investigated using the rotational cylinder viscometer, and the testing results are compared to the manufacturer's data.

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