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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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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...


Keywords: English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Spreads and sauces 

Using rheology as a Benchmarking tool Webinar - Recorded (English)

The fundamental principle of designing products for various applications lies in the ability to accurately engineer the microstructural properties to achieve the desired performance response. Rheology presents itself as a unique tool to not only prov...

Date recorded:
June 18 2015
Language:
English

Keywords: English Rheology and viscosity Rheometry - capillary Webinar - Recorded Eastern Time Rheometry - microfluidic flow 

Suspension properties Masterclass 4: Using rheology to assess suspension stability Webinar - Recorded (English)

This presentation discusses the importance of particle size, zeta potential and rheology for a functional suspension, and demonstrates how these properties can be manipulated to induce dispersion stability.

Product:
Kinexus range,Zetasizer Nano range,Mastersizer range
Date recorded:
April 10 2013
Language:
English

Keywords: Suspensions, slurries and pastes English Kinexus range Mastersizer range Particle size Rheology and viscosity Zeta potential Dynamic Light Scattering Electrophoretic Light Scattering Webinar - Recorded Greenwich Time Zetasizer Nano range 

Relative viscosity screening of monoclonal antibody (mAb) formulations at low concentration and low viscosity for early stage developability Application Note (English)

Viscosizer TD provides automated relative viscosity measurements with high reproducibility at low viscosity, to help identify molecules with abnormally high viscosity-concentration profiles at low sample concentrations as early as possible in the dev...


Keywords: English Application Note Rheology and viscosity Proteins Bioformulation development Antibodies and derivatives Viscosizer TD 

Determining cure profile and post-cure shrinkage of photopolymers using UV accessory on a rotational rheometer Application Note (English)

This application note shows how in-situ characterization of rheological properties of UV curable materials can be performed on a Kinexus rotational rheometer with UV curing accessory.


Keywords: Bonding and curing systems Films and coatings English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Cosmetics Adhesives and sealants Paints, inks and coatings Sintered components Specialty and novel polymers 
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