Chemical Focus
includes enhanced software capabilities, data reduction features, and instrument monitoring. Optimised for walk-up sample screening, all analysis
ports can be operated independently and concurrently, allowing the user to load and unload samples at any time, regardless of the preparation or analysis stage. A new analysis can begin as soon as another is finished. Long-duration dewars and isothermal jackets
assure a stable thermal profile along the length of both the sample and the saturation pressure (P0) tubes throughout lengthy analyses. The P0 value may be entered, or measured either continuously or at selected intervals.
Surface zeta potential A series of new application notes posted on the Malvern Instruments website describes the quick and easy measurement of surface zeta potential using the zeta potential planar cell for the Zetasizer Nano particle characterisation system (Fig. 1). Widely used as an indicator of the stability of
particle suspensions and colloidal samples, surface zeta potential is traditionally measured using the specialist technique of streaming potential. Malvern’s surface zeta potential cell eliminates
the need for a dedicated solution, allowing users to measure the zeta potential of surfaces in an aqueous medium on a standard instrument. The application
note ‘Determination of the zeta potential of the surface of PTFE’, and others relating to different aspects of the measurement, can now be downloaded from Malvern’s online knowledge centre:
http://www.malvern.com/ surface-zete-potential-ptfe According to Malvern, adding the surface zeta
potential measurement capability to Zetasizer Nano systems opens up new applications in areas of research that include understanding and optimising surface coatings and evaluating the effect of environmental changes on polymers or glass. In addition to zeta potential measurements, the
Zetasizer Nano instruments measure particle and molecular size from below a nanometre to several microns, electrophoretic mobility, and molecular weight. Finally, the new FlowCAM-ES imaging particle
analysis system from Fluid Imaging Technologies automatically detects, images, counts and measures metal particles in rinse water to verify the effectiveness of the rinse step in removing contaminants. Operating on-line within the production or
processing line, the newest FlowCAM automatically extracts, dilutes and runs samples of the wash water, taking a high-resolution, digital image of each particle detected and revealing its actual size and shape using more than 30 different measurement parameters, all in real-time. The risk of further contamination or error due to human involvement is eliminated. n
For more information ✔ at
www.engineerlive.com/epe
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