Nanoparticles are increasingly used in innovative advanced products and provide enhanced, unique properties of great commercial and societal value. The measurement of the number concentration of colloidal particles is of major commercial interest as it: enables the optimisation of materials specification and design; is essential for risk assessment and quality control; supports compliance with regulatory requirements; and underpins claims to reliability, performance and lifetime in the formulation of products containing particles.
The stakeholder community now has increasing confidence in the tools available to them for the measurement of colloidal concentration. Previously, whilst DLS has, in theory, been able to calculate number concentration, it has been notoriously sensitive to impurities and has therefore had limited application. DLS is a widely-used and available technique and, having a more robust concentration analysis feature within the Zetasizer Ultra, makes such measurements more accessible to researchers going forward.
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