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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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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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Understanding and Controlling the Rheology of Particulate Dispersions Webinar - Live (English)

Many products (or product precursors) in the paint, personal product, cleaning, coatings product, and food areas, etc., include a large amount of finely divided solid particulate material in a liquid matrix. The amount, shape, size distribution and i...

Date:
September 22 2016
Language:
English


Simple method for determining stress and strain constants for non-standard measuring systems on a rotational rheometer Poster (English)

There is often a necessity to measure, or at least estimate, true viscosity values using non-standard measuring systems on a rotational rheometer. This may be to replicate a mixing or manufacturing process on a lab scale, to keep a sample dispersed a...



Using rheology to enhance formulation Article (English)

Viscometers are used routinely to characterise food and drink roducts and offer simple, straightforward measurement for QC. They are also applied in formulation, but here rheology has far more to offer than simple viscosity measurements. Switching fr...



Setting a benchmark: Using rheology to define the performance of personal care products Article (English)

Products, quality is often defined by a range of functional and sensory attributes, some of which may be easily measured - such as color - and others which may not. Visual or textural appearance and ease of application exemplify properties in this se...



Using Rheology to Optimize the Performance of EOR Fluids Article (English)

Although the price of crude oil has dropped significantly in the past couple of years, the longer term predictions suggest that it may settle in the region of US$50 – 70/bbl, a figure that still encourages the exploitation of existing oilfields, with...


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Glossary

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Simulating mastication on Kinexus rheometers

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Upcoming webinar

Understanding and Controlling the Rheology of Particulate Dispersions
(September 22 2016)

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