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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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Published on: April 19, 2018

Microsecond Structural Rheology.

Felix Lehmkühler^1,2, Ingo Steinke^1,2, Martin A Schroer^1,2

¹Deutsches Elektronen-Synchrotron DESY , Notkestraße 85, 22607 Hamburg, Germany.

The Journal of Physical Chemistry Letters

|July 19, 2017

Summary

This summary is machine-generated.

This study reveals how complex liquids form particle strings and hydroclusters under high shear rates using X-ray scattering. These structures influence shear thinning and thickening, relaxing slowly after the shear is removed.

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Area of Science:

Colloid and interface science
Soft matter physics
Rheology

Background:

Understanding complex liquid behavior under shear is crucial for explaining phenomena like shear thinning and thickening.
The formation of particle strings and hydroclusters significantly impacts fluid dynamics.

Purpose of the Study:

To investigate the local structure of complex liquids under high shear rates.
To characterize the formation and relaxation of particle clusters in sheared colloidal suspensions.

Main Methods:

Microfocus X-ray scattering experiments were conducted on silica colloids in a liquid jet.
High shear rates were applied, and structural changes were analyzed along and across the flow direction.

Main Results:

Direction-dependent modifications in the structure factor were observed, indicating cluster formation.
Particle strings and ordered clusters in compression lines were identified.
Structure relaxation occurred over a timescale 10 times longer than Brownian motion.

Conclusions:

The study provides the first experimental characterization of complex fluid flow at high shear rates.
Micrometer and microsecond resolution revealed cluster formation and relaxation dynamics.
Findings offer insights into the mechanisms behind shear thinning and thickening phenomena.