Posted: August 29, 2009

Malvern adds '10 ways to control rheology by changing particle properties' to INFORM series of white papers

(Nanowerk News) ‘10 ways to control rheology by changing particle properties’ is the latest addition to Malvern Instruments’ INFORM series of white papers, which are designed to provide advice on material characterization issues. Freely downloadable from the Malvern website, this new document guides the reader through some of the fundamental properties of dispersed systems and demonstrates how these affect its rheology. A variety of examples illustrates the effects on rheology of changing particle size, size distribution, shape and zeta potential, alone and in combination.
Many materials used today are disperse systems where one substance, often a particulate, is dispersed in another phase. Examples are common in areas as diverse as adhesives, agrochemicals, cement, ceramics, colloids, cosmetics and personal care formulations, food and drink, mining and mineral slurries, paints, inks and surface coatings, pharmaceuticals and polymer systems. The physical properties of the dispersed particles – average particle size, size distribution, zeta potential or charge on the particles, and particle shape – all influence bulk material properties such as rheology. Therefore the rheology of a dispersed system can be controlled through the measurement and manipulation of key parameters.
About Malvern Instruments
Malvern Instruments provides a range of complementary materials characterization tools that deliver inter-related measurements reflecting the complexities of particulates and disperse systems, nanomaterials and macromolecules. Analytical instruments from Malvern are used in the characterization of a wide variety of materials, from industrial bulk powders to nanomaterials and delicate macromolecules. A broad portfolio of innovative technologies is combined with intelligent, user-friendly software. These systems deliver industrially relevant data enabling our customers to make the connection between micro (such as particle size) and macro (bulk) material properties (rheology) and chemical composition (chemical imaging).
Particle size, particle shape, zeta potential, molecular weight, chemical composition and rheological properties measurements are now joined by advanced chromatography solutions (GPC/SEC), extending Malvern’s technologies for protein molecular weight, size and aggregation measurements, and synthetic polymer molecular weight and distribution. The company’s laboratory, at-line, on-line and in-line solutions are proven in sectors as diverse as cement production and pharmaceutical drug discovery.
Headquartered in Malvern, UK, Malvern Instruments has subsidiary organizations in all major European markets, North America, China, Korea and Japan, a joint venture in India, a global distributor network and applications laboratories around the world.
Source: Malvern Instruments
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