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Rotational rheometry is a powerful technique for the measurement of complex shear rheology across all material types – sensitive enough to measure the viscosity of dilute polymer solutions, and yet robust enough to measure the viscoelasticity of high modulus polymers or composites. Rotational rheometry is ideal for discerning structural and compositional changes of materials, which can be critical controlling factors in flow and deformation properties, and ultimately product stability and performance.

The basics of the rotational rheometry technique are as follows:

  • The sample is loaded into the gap of a measuring system, or geometry – such as a cone and plate or a concentric cylinder system – specifically designed to impose simple shear flow when rotated.
  • The measuring system is supported by a virtually frictionless air-bearing, and driven by an ultra-low inertia motor, coupled to an ultra-high precision position encoder. The sample and measuring system are also temperature controlled.
  • Various rheological characteristics of the sample can be determined by rotating, oscillating or applying a step function to the measuring system – either by controlling motor torque (stress controlled rheometry) or position change (strain controlled rheometry).
  • Common test modes are rotational (or flow) to measure shear viscosity, and oscillation to measure dynamic material properties such as viscoelastic modulus and phase angle.

Rotational rheometry also enables other rheological properties to be evaluated, including yield stress, thixotropy, creep and recovery and stress relaxation.

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Characterizing Opthalmic Viscosurgical Devices (OVDs) using a rotational rheometer Application Note (English)

This application note discusses the methodology and results for the rheological characterization of Opthalmic Viscosurgical Devices (OVDs) according to the International Standard ISO15798:2013

Keywords: Polymer solutions English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Polysaccharides Pharmaceutical formulation and development Ophthalmic 

Optimizing High-performance Ceramic Inkjet Inks Article (English)

This article highlights how engineering high performance ceramic inkjet inks relies on measuring viscosity across the broad range of shear rates experienced during printing. This shear range can be accessed by combining rotational rheometry for low s...

Keywords: English Article Kinexus range Zetasizer range Rheology and viscosity Dynamic Light Scattering Rheometry - rotational Paints, inks and coatings m-VROCi Rheometry - microfluidic flow 

How to characterize and optimize inkjet inks Part 3 Webinar - Recorded (English)

In part three of our inkjet ink webinar series we focus on inkjet ink performance and the importance of rheology for evaluating and controlling printing behavior. The main factors influencing printing behavior are viscosity, elasticity and surface te...

Date recorded:
November 13 2014

Keywords: English Rheology and viscosity Rheometry - rotational Pigments and toners Paints, inks and coatings Webinar - Recorded Eastern Time Rheometry - microfluidic flow 

Analytical strategies for ink formulation Whitepaper (English)

This white paper offers practical guidance on using a range of analytical techniques, including rheology, particle size and zeta potential measurement to assist in the formulation of Inkjet inks. 

Keywords: Films and coatings English Whitepaper Particle size Rheology and viscosity Dynamic Light Scattering Laser diffraction Rheometry - rotational Pigments and toners Paints, inks and coatings Rheometry - microfluidic flow 
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