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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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Optimize ceramic inkjet ink printability, stability & behavior using rheology Webinar - Live (English)

The printing flexibility that inkjet technology offers is enabling rapid growth in industrial and commercial applications including the decoration of ceramic substrates Inkjet inks must meet certain criteria; firstly they...

Product:
m-VROCi
Date:
May 7 2014
Language:
English

Keywords: English Rheology and viscosity Rheometry - rotational Paints, inks and coatings Webinar - Live Eastern Time m-VROCi Rheometry - microfluidic flow 

Optimizing Rheology for Ceramic Inkjet Inks Application Note (English)

Characterizing an inkjet ink formulation from stability through to printhead compatibility requires specific rheological methodology and shear rate range measurements, with pigment particle size and loading being key factors affectin...


Keywords: English Application Note Kinexus range Particle size Rheology and viscosity Dynamic Light Scattering Rheometry - rotational Paints, inks and coatings Zetasizer Nano range m-VROCi Rheometry - microfluidic flow 

Next generation rheometers from Malvern: Kinexus + series Webinar - Recorded (English)

In this webinar we discuss the advantages of the Kinexus + series for your rheological measurement. Focus of the talk will be on the practical measurement results at low shears, how the unprecedented gap/axial capabilities of Kinexus can give you ne...

Product:
Kinexus range
Date recorded:
March 20 2014
Language:
English

Keywords: English Kinexus range Rheometry - rotational Webinar - Recorded Eastern Time 

Malvern Instruments launches new models of the Kinexus rotational rheometer Press Release (English)

Malvern Instruments has introduced two new models to its Kinexus line of rotational rheometers. The new Kinexus pro+ and Kinexus ultra+ incorporate enhancements to Malvern’s unique proprietary air bearing technology, the performance defin...


Keywords: English Kinexus range Rheology and viscosity Rheometry - rotational Press Release 

A recipe for success: Understanding the impact of production and environmental stresses on food emulsions Article (English)

Food Science researchers from the University of Massachusetts investigate the efficacy of different production techniques, and the subsequent influence of environmental stresses such as pH, ionic strength and temperature, on emulsion stability.


Keywords: Emulsions and creams English Article Kinexus range Zetasizer range Particle size Rheology and viscosity Zeta potential Dynamic Light Scattering Electrophoretic Light Scattering Rheometry - rotational Dairy products Drinks Spreads and sauces 
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Glossary

Rheology Rocks spotlight

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