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Microliter viscometry using a bright-field microscope: η-DDM.

M A Escobedo-Sánchez1, J P Segovia-Gutiérrez, A B Zuccolotto-Bernez

  • 1Condensed Matter Physics Laboratory, Heinrich Heine University, 40225 Düsseldorf, Germany. escobedo@hhu.de Florian.Platten@hhu.de Stefan.Egelhaaf@hhu.de.

Soft Matter
|August 17, 2018
PubMed
Summary
This summary is machine-generated.

Differential Dynamic Microscopy (DDM) with the Cox-Merz rule offers a novel method to measure steady-shear viscosity. This technique uses standard microscopes and requires only microliters of sample, ideal for soft matter and biological systems.

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Area of Science:

  • Soft Matter Physics
  • Rheology
  • Colloidal Science

Background:

  • Rheological properties are crucial for understanding material behavior.
  • Microrheology infers bulk properties from tracer particle motion.
  • Differential Dynamic Microscopy (DDM) analyzes particle motion via the intermediate scattering function.

Purpose of the Study:

  • To present a novel method (η-DDM) for measuring steady-shear viscosity.
  • To demonstrate the utility of DDM combined with the Cox-Merz rule for rheological measurements.
  • To validate the method using diverse sample systems.

Main Methods:

  • Utilizing Differential Dynamic Microscopy (DDM) to analyze Brownian motion of colloidal tracers.
  • Calculating the mean-squared displacement (MSD) from the intermediate scattering function.
  • Applying the empirical Cox-Merz rule to determine steady-shear viscosity (viscosity at zero frequency).

Main Results:

  • DDM combined with the Cox-Merz rule accurately measures steady-shear viscosity.
  • The method provides reliable data on long time and length scales, crucial for low frequencies.
  • Successful validation across Newtonian fluids, protein suspensions, and polymer solutions.

Conclusions:

  • The η-DDM method enables viscosity measurements using standard bright-field optical microscopes.
  • This technique functions as a convenient and reliable microliter viscometer.
  • Its low sample volume requirement makes it highly valuable for biological and soft matter applications.