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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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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. molecular weight, molecular size, molecular structure, intrinsic viscosity by gel permeation chromatography with Viscotek
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Demo at your desk: Kinexus Webinar - Recorded (English)

This live online demo is designed to provide you with a virtual hands-on introduction to the Kinexus rheometer. In this webinar, you will be able to take a look at the Kinexus rheometer and some of its typical measurement systems (geometries) and acc...

Product:
Kinexus range
Date recorded:
April 28 2016
Language:
English


Using particle size analysis and rheology to better understand the mouthfeel of chocolate Webinar - Recorded (English)

Chocolate is an affordable yet luxurious treat with mature markets in Europe and North America and developing markets around the world. The secret of chocolate’s almost universal appeal is in the mouthfeel – the “snap” of the first bite, how the choc...

Date recorded:
March 24 2016
Language:
English


Thixotropy! What is it? Why is it important? How do I measure it? Webinar - Recorded (English)

Thixotropy is associated with reversible, microstructural and time dependent changes that come about due to local spatial rearrangement of microstructural components in a structured fluid. This frequently found time-response of a microstructure th...

Product:
Kinexus range
Date recorded:
March 16 2016
Language:
English


Comparing the rheology and particle size of smoothies made with different blenders Application Note (English)

Two smoothie makers have been evaluated and compared by measuring the particle (fiber) size and viscosity of two different smoothies recipes to see which smoothie maker gave the smoothest blend. 



Rheological characterization of asphalt binders at low temperatures by using the 4-mm DSR technique. Part 2 Webinar - Recorded (English)

Recently, it has become increasingly popular to measure the low-temperature rheological properties of asphalt binders by using 4-mm parallel plate geometry on a rotational rheometer. In this webinar, rheological data measured with this so-called “4-m...

Product:
Kinexus DSR range
Date recorded:
February 17 2016
Language:
English

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Simulating mastication on Kinexus rheometers

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