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Malvern provides a wide range of material characterisation systems used throughout the chemicals and chemical processing industries.
Chemical data collection and analysis
Malvern helps to solve complex analytical challenges and provide data for optimising products and processes, predicting how products will behave in use and improving productivity. They are used for materials ranging from polymers in solution, particle and nanoparticle suspensions and emulsions, through to sprays and aerosols, industrial bulk powders and high-concentration slurries.
The parameters they measure include:
- Particle shape, size and concentration, and zeta potential
- Protein charge
- Molecular weight, mass, conformation, interactions and stability
- Rheological properties
- Chemical identification
Laser diffraction for measuring particle size and size distributions
Laser diffraction is a widely used particle sizing technique for materials from sub-micron to several millimetres in size.
Mastersizer 3000 is a laboratory instrument that delivers rapid, accurate particle size distributions for wet and dry dispersions. It offers exceptional performance in a small footprint and delivers highly reliable, operator-independent measurements.
Insitec systems provide online continuous particle size analysis for efficient, cost-effective monitoring and control of industrial processes. They are suitable for process streams from dry powders to hot, sticky slurries, sprays and emulsions.
Spraytec measures spray particle and droplet size distributions in real-time during the course of a spray event, providing data for efficient development of sprays and aerosols. Flexible configuration enables droplet size measurement for a wide range of products.
Dynamic light scattering for characterising submicron particle dispersions
Dynamic light scattering (DLS) is a non-invasive, well-established technique for measuring the size and size distribution of molecules and particles in the submicron region, with the latest technology measuring less than 1nm. It is typically used to characterise particles, emulsions or molecules dispersed or dissolved in a liquid.
The Zetasizer series measures from less than 1nm to several microns using DLS. Zetasizer Nano systems also measure zeta potential and electrophoretic mobility using electrophoretic light scattering, and molecular weight using static light scattering.
Nanoparticle tracking analysis to visualise and measure nanoparticles
Malvern NanoSight systems use nanoparticle tracking analysis (NTA) to characterise nanoparticles from 10nm to 2,000nm in solution. Each particle is individually but simultaneously analysed by direct observation and measurement of diffusion events.
This particle-by-particle methodology produces high-resolution results for particle size distribution and concentration, with visual validation. A fluorescence mode provides differentiation of labelled or naturally fluorescing particles.
Particle shape and chemical identification
Particle shape and size can significantly impact the performance and process handling of particulate materials.
It may influence properties such as the bioavailability of drug particles in tablets and suspensions, material strength in metal and ceramic sintered components, printing quality of toners and solder pastes, packing behaviour of chromatography columns, quality of mineral-based coatings finishes and the cutting performance of silicon carbide (SiC) abrasives for solar panel manufacture.
Morphologi G3 and Sysmex FPIA-3000 imaging-based systems provide particle size and shape measurement for dispersed samples from 0.5 microns to several millimetres.
The addition of Raman spectroscopy in the Morphologi G3-ID system combines automated imaging with chemical identification of individual particles in a technique known as morphologically directed Raman spectroscopy (MDRS).This enables possible chemical identification of individual particles within a multi-component blend.
Triple detection GPC to identify polymer molecular weight, size and structure
Also known as size exclusion chromatography (SEC), gel permeation chromatography (GPC) first separates dissolved macromolecules by size, based on their elution from a gel-filled chromatography column.
Light scattering, viscometer and concentration detectors then measure absolute molecular weight, molecular size and intrinsic viscosity, providing information on macromolecular structure, conformation, aggregation and branching.
These parameters are fundamental to polymer performance in multiple applications. Information from Malvern's GPC / SEC systems helps in controlling the strength, toughness and other performance attributes of materials and tailoring the behaviour of polymer-based products.
Measurement of rheological properties
Rotational, capillary and microfluidic flow rheometers from Malvern enable measurement of flow and deformation properties of materials, from dilute, weakly structured solutions to concentrated gels, slurries and pastes. The resulting data is used to understand and control product stability and performance.
Kinexus rotational rheometers are sensitive enough to measure the viscosity of dilute polymer solutions, yet sufficiently robust enough to measure viscoelasticity of high modulus polymers or composites. Unique software provides total flexibility of test set-up for research and development, through to standard operating procedure (SOP) driven testing for more routine rheological requirements.
Rosand capillary rheometers characterise the rheology of materials by extrusion under the high pressures, shear rates and temperatures relevant to processing. Materials include polymer melts, ceramics, foodstuffs, inks and coatings.
Malvern Instruments Ltd.
Enigma Business Park
+44 1684 892456
+44 1684 892789
Available White Papers
A Basic Introduction to Rheology Rheology is as much about the deformation of solid-like materials.
Five Compelling Reasons to Replace Sieve Analysis with Laser Diffraction Sieving remains in use across the manufacturing industry due to its low cost, simplicity, and ability to measure relatively coarse particles up to several centimetres in size.
Number and Volume Size Distributions The nature of a particle size distribution analysis is dependent upon the manner in which the particles involved are weighted.
Calcium Carbonate Particle Size analysis By Laser Diffraction The Mastersizer 3000 laser diffraction system can measure particle size from nanometres to millimetres, with measurements over the range being achieved in only a few minutes
Chewing the Fat 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 consumer sensory data for these products.