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Rheology is the study of flow and deformation of materials under applied forces which is routinely measured using a rheometer. The measurement of rheological properties is applicable to all materials – from fluids such as dilute solutions of polymers and surfactants through to concentrated protein formulations, to semi-solids such as pastes and creams, to molten or solid polymers as well as asphalt. Rheological properties can be measured from bulk sample deformation using a mechanical rheometer, or on a micro-scale by using a microcapillary viscometer or an optical technique such as Microrheology.

Many commonly-used materials and formulations exhibit complex rheological properties, whose viscosity and viscoelasticity can vary depending upon the external conditions applied, such as stress, strain, timescale and temperature. Internal sample variations such as protein concentration and stability, and formulation type for biopharmaceuticals, are also key factors that determine rheological properties.

Rheological properties impact at all stages of material use across multiple industries – from formulation development and stability to processing and product performance. The type of rheometer required for measuring these properties is often dependent on the relevant shear rates and timescales as well as sample size and viscosity. Examples of rheological measurements include:

  • Viscosity profiling for non-Newtonian shear-dependent behavior to simulate processing or in-use conditions.
  • Viscoelastic fingerprinting for material classification to determine extent of solid-like or liquid-like behavior.
  • Optimising and assessing dispersion stability.
  • Determination of thixotropy of paints and coatings for product application and final finish quality.
  • Impact of molecular architecture of polymers on viscoelasticity for processing and end-use performance.
  • Benchmarking Food and Personal Care products for ability to pump or spread.
  • Full cure profiling for bonding or gelling systems.
  • Pre-formulation screening for therapeutics, particularly biopharmaceuticals.

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The rheology of cheese and mayonnaise Webinar - Live (English)

Ever thought of rheology when you eat a pizza? The classic marketing shots of pizza show the viscoelastic properties of the mozarella cheese amenable to a number of rheological measurements. The pour properties of mayonnaise are dictated by a number ...

Date:
April 29 2015
Language:
English

Keywords: English Rheology and viscosity Rheometry - rotational Food and drinks Webinar - Live Eastern Time 

Measuring the rheology of polymer solutions Whitepaper (English)

The whitepaper discusses some basic principles of polymer solution rheology and how it can be measured and manipulated to optimize rheological behaviour 


Keywords: Polymer solutions English Whitepaper Rheology and viscosity Rheometry - rotational Polysaccharides Microrheology Rheometry - microfluidic flow 

Rheology masterclass 1 - The basic of viscosity Webinar - Recorded (English)

Rheology is defined as the science of deformation and flow and in particular refers to materials that show viscoelastic or non-Newtonian behaviour when stressed. Such materials include suspensions, emulsions, polymer solutions and foams to name but a...

Product:
Kinexus lab+,Kinexus pro+,Kinexus ultra+
Date recorded:
March 31 2015
Language:
English

Keywords: English Kinexus pro+ Kinexus ultra+ Rheology and viscosity Rheometry - rotational Webinar - Recorded Eastern Time Kinexus lab+ 

Predicting the stability of dispersions with a yield stress Application Note (English)

This note discusses a fast and convenient way for predicting the stability of dispersion's that have a yield stress


Keywords: Suspensions, slurries and pastes English Application Note Kinexus range Rheology and viscosity 

Rheological characterization of dispersed systems with novel geometries Webinar - Recorded (English)

This webinar discusses the use of the flexible gapping system of Kinexus to allow the use of a range of novel geometries to measure otherwise difficult to characterise disperse systems. Comparisons will be made on model systems, a zero-shear viscosit...

Product:
Kinexus lab+,Kinexus pro+,Kinexus ultra+
Date recorded:
March 17 2015
Language:
English

Keywords: English Kinexus pro+ Kinexus ultra+ Rheology and viscosity Rheometry - rotational Webinar - Recorded Eastern Time Kinexus lab+ 
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The rheology of cheese and mayonnaise
(April 29 2015)

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