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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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Kinexus range Next generation rheometer redefines ease of use Image
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Rosand range Capillary rheometers for process-relevant material testing. Image
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DSR Industry standard Asphalt binder grade testing Image
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Viscosizer TD Automating ultra-low volume Taylor Dispersion Analysis Image
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Viscotek DSV Automated measurement of relative viscosity from dilute polymer solutions. Image
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Making squeeze flow measurements on a rotational rheometer Webinar - Live (English)

Squeeze flow rheometry involves compressing a material between two parallel plates in order to determine its rheological properties. Squeeze flow measurements can be made with a rotational rheometer having suitable axial capabilities (normal force an...

Product:
Kinexus range
Date:
September 24 2015
Language:
English


Understanding Yield Stress Measurements Whitepaper (English)

This Whitepaper discusses the various approaches available to measure yield stress, and the practical measurement set-up and test parameters to obtain relevant, robust and reliable yield stress data using a rotational rheometer.



Chewing the fat Article (English)

Dr Steve Carrington of Malvern Instruments and Prof. D. J. McClements of the University of Massachusetts describe the use of rheology to measure how food changes during mastication and to compare the rheological behaviour of low fat sauces with consu...



Optimizing Rheology for Paint and Coating Applications Whitepaper (English)

This whitepaper discusses the use of rheology for optimizing the performance of paints and coatings



Overcoming solvent evaporation/drying during rheological testing on rotational rheometer Application Note (English)

This application note shows how using a solvent trap can be used to prevent sample drying/solvent loss during extended testing, helping to ensure that only rheological changes are being measured and not artifacts resulting from drying of the sample a...


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Upcoming webinar

Making squeeze flow measurements on a rotational rheometer
(September 24 2015)

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