Disc centrifuge photosedimentometer

Latex particle sizes and polydispersity were measured by use of an ICI Joyce Loebl disc centrifuge (JLDC) photosedimentometer (11,12). 

An Improved Disc Centrifuge Photosedimentometer and Data System for Particle Size Distribution Analysis... 

An Improved disc centrifuge photosedimentometer (DCP) was developed for use in the determination of the particle size and size distribution of latices, pigments and other particulates. Separation is based on Stokes Law for the sedimentation of particles in a centrifugal force field and does not rely on the use of particle size calibrants or standards. The DCP Instrument provides accurate stable particle size analyses over a wide range of conditions while at the same time is rugged enough for heavy use in both a research and quality control environment. A stand-alone data collection, analysis and management system was developed both for routine quality control operation and for research use of the instrument. 

Koehler, M. E., Zander, R. A., Gill, T.T., "An Improved Disc Centrifuge Photosedimentometer and Data System", This Volume. 

Samples of narrow polystyrene (PS) latex, steam-stripped to remove excess, unreacted monomer, were purchased from a supplier in order to test the calculation of extinction efficiencies for use in correcting data from a disc centrifuge photosedimentometer.l It was crucial that the sizes were known with an accuracy of 1%, independent of the DCP measurement. TEM values were given by the manufacturer. In addition PCS and DCP measurements were made. Table 1 shows the results. 

B. H. Kaye and M. R. Jackson, Size Analysis of Latex Emulsions Using a Centrifugal Disc Photosedimentometer, Powder Technology, 1 (1967), 81-88. 

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