Optical and Mechanical Properties of a Star Diblock Copolymer Melt in Oscillatory Shear Flow

1994 ◽  
Vol 27 (17) ◽  
pp. 4804-4809 ◽  
Author(s):  
Lynden A. Archer ◽  
Gerald G. Fuller
Keyword(s):  
Mechanical Properties ◽  
Shear Flow ◽  
Diblock Copolymer ◽  
Oscillatory Shear ◽  
Oscillatory Shear Flow ◽  
Optical And Mechanical Properties

Steady and Oscillatory Shear Flow Alignment Dynamics in a Lamellar Diblock Copolymer Solution

1998 ◽  
Vol 31 (11) ◽  
pp. 3656-3670 ◽  
Author(s):  
Janice L. Zryd ◽  
Wesley R. Burghardt
Keyword(s):  
Shear Flow ◽  
Diblock Copolymer ◽  
Oscillatory Shear ◽  
Copolymer Solution ◽  
Oscillatory Shear Flow ◽  
Diblock Copolymer Solution ◽  
Flow Alignment

scholarly journals Cylindrically confined assembly of diblock copolymer under oscillatory shear flow

2016 ◽  
Vol 19 (3) ◽  
pp. 33601
Author(s):  
Guo ◽  
Pan ◽  
Zhang ◽  
Sun ◽  
Wang ◽  
...  
Keyword(s):  
Shear Flow ◽  
Diblock Copolymer ◽  
Oscillatory Shear ◽  
Oscillatory Shear Flow

Visualizing and exploring nonlinear behavior, timescales, and mechanical signatures of human blood

Biorheology ◽  
2021 ◽  
pp. 1-27
Author(s):  
Matthew Armstrong ◽  
Erin Milner ◽  
Chi Nguyen ◽  
Trevor Corrigan ◽  
Yu-Fan Lee
Keyword(s):  
Mechanical Properties ◽  
Shear Flow ◽  
Human Blood ◽  
Large Amplitude ◽  
Oscillatory Shear ◽  
Large Amplitude Oscillatory Shear ◽  
Physical Processes ◽  
Blood Draw ◽  
Protein Film ◽  
Oscillatory Shear Flow

Human blood is an excellent example of a thixo-elasto-visco-plastic (TEVP), shear-thinning fluid, with an apparent yield stress. We demonstrate a series of unique strain-controlled experiments to elucidate the evolving elastic and viscous properties of human blood and show the associated unique viscoelastic and thixotropic signatures. The experimental techniques and procedures outlined here, and the robust mechanical analysis framework offers a window into the complex nonlinearity of the relationship between the microstructure and mechanical properties of human blood. Rather than using the traditional discrete Fourier transform to analyze the data, two contemporary methods, the MITlaos, Chebychev analysis technique, and the other sequence of physical processes (SPP), are applied to these oscillatory tests. These methods are advantageous because they both allow for the analysis of large amplitude oscillatory shear flow. These frameworks will highlight how the blood undergoes thickening-thinning and hardening-softening cycles that are directly related to microstructures during large amplitude oscillatory shear flow. We show these results with a series of Cole-Cole and Lissajous-Bowditch plots, then compare to an aqueous solution of xanthan gum and glycerol. The analysis presented here is independent of a specific TEVP rheological model. (We acknowledge that the protein film on surface of blood air interface issue may exist; based on literature we estimate this to contribute no more than +0.375 mPa s to viscosity at, or 0.0375 Pa to the stress measurement at shear rates below 100 s−1.) BACKGROUND: Human blood is a thixo-elasto-visco-plastic (TEVP) material that exhibits unique fluctuations in mechanical properties based on physiology, and shear rate. We demonstrate new visual tools to help visualize and characterize these varied mechanical properties. OBJECTIVE: Our objective is to demonstrate contemporary visual and numerical tools to help visualize and characterize the varied mechanical properties of human blood. METHODS: Using the ARESG2 strain-controlled rheometer with double wall couette geometry and eight human blood donors, with lab test results, elastic and viscous properties are investigated using Series of Physical Processes (SPP) and MITLaos to both analyze and visualize the mechanical signatures of the blood. RESULTS: Variations of mechanical properties are shown via SPP generated Cole-Cole plots and MITLaos analysis. These variations are a function of physiological properties of blood on the day of the blood draw based on hematocrit, fibrinogen, cholesterol, triglycerides, and a host of other proteins and constituents. Each rheological experiment with blood is replicated with an analogous experiments with 0.04 wt% xanthan in glycerol, and water to demonstrate that the mechanical properties of the human blood, and its rheological signatures are unique to human blood. CONCLUSIONS: Human blood is proven to be a TEVP material, as shown on a series of Cole-Cole plots for eight different donors, at two different frequency and strain amplitude combinations. Variations in Cole-Cole plots for each donor are shown. MITLaos average mechanical properties are calculated and shown. Aggregated elastic and viscous projections and a Cole-Cole plot is shown for Donors 1–8, along with 95% confidence interval.

Phase behaviors of diblock copolymer/nanorod composites under oscillatory shear flow

2012 ◽  
Vol 127 (6) ◽  
pp. 4470-4482 ◽  
Author(s):  
Linli He ◽  
Shiben Li ◽  
Linxi Zhang
Keyword(s):  
Shear Flow ◽  
Diblock Copolymer ◽  
Oscillatory Shear ◽  
Oscillatory Shear Flow ◽  
Phase Behaviors

Symmetric diblock copolymers under large amplitude oscillatory shear flow: Entanglement effect

1995 ◽  
Vol 103 (11) ◽  
pp. 4784-4793 ◽  
Author(s):  
Yuanming Zhang ◽  
Ulrich Wiesner
Keyword(s):  
Shear Flow ◽  
Large Amplitude ◽  
Diblock Copolymers ◽  
Oscillatory Shear ◽  
Large Amplitude Oscillatory Shear ◽  
Oscillatory Shear Flow

Numerical simulations of small amplitude oscillatory shear flow of suspensions of rigid particles in non-Newtonian liquids at finite inertia

2021 ◽  
Vol 65 (5) ◽  
pp. 821-835
Author(s):  
Massimiliano M. Villone ◽  
Marco E. Rosti ◽  
Outi Tammisola ◽  
Luca Brandt
Keyword(s):  
Shear Flow ◽  
Numerical Simulations ◽  
Small Amplitude ◽  
Oscillatory Shear ◽  
Small Amplitude Oscillatory Shear ◽  
Rigid Particles ◽  
Oscillatory Shear Flow ◽  
Newtonian Liquids

The first normal stress difference of non-Brownian hard-sphere suspensions in the oscillatory shear flow near the liquid and crystal coexistence region

Soft Matter ◽  
2020 ◽  
Vol 16 (43) ◽  
pp. 9864-9875
Author(s):  
Young Ki Lee ◽  
Kyu Hyun ◽  
Kyung Hyun Ahn
Keyword(s):  
Shear Flow ◽  
Normal Stress ◽  
Hard Sphere ◽  
Normal Stress Difference ◽  
Oscillatory Shear ◽  
Stress Difference ◽  
Large Amplitude Oscillatory Shear ◽  
First Normal Stress Difference ◽  
Oscillatory Shear Flow ◽  
Sphere Suspensions

The first normal stress difference (N1) as well as shear stress of non-Brownian hard-sphere suspensions in small to large amplitude oscillatory shear flow is investigated.

Dynamic simulations of individual macromolecules in oscillatory shear flow

2009 ◽  
Vol 53 (2) ◽  
pp. 275-291 ◽  
Author(s):  
Dennis G. Thomas ◽  
Ryan J. DePuit ◽  
Bamin Khomami
Keyword(s):  
Shear Flow ◽  
Oscillatory Shear ◽  
Dynamic Simulations ◽  
Oscillatory Shear Flow
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