STP1146: A Photometric Study of Dilute Microcapsule Suspensions

    Stern, AJ
    Senior Research Chemist, the Formulation Technology Section of Monsanto Agricultural Company, a unit of Monsanto Company, St. Louis, MO

    Pages: 10    Published: Jan 1993


    Abstract

    Dilute suspensibility of solids, of great importance to the users of suspension concentrate formulations, is a complex subject. In order to better understand the behavior of dilute microcapsule suspensions, a photometric method has been used to quantitatively measure their sedimentation as a function of time. Applied to eight different microcapsule formulations, this method has shown that 1) microcapsule settling rates are not linear; 2) shell wall structure largely influences the degree of microcapsule flocculation and hence settling rates; and 3) in many cases, suspension and resuspension are inversely related.

    Keywords:

    photometric sedimentation, microcapsule, suspension, resuspension, flocculation


    Paper ID: STP20189S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP20189S


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