Abstract
Handling, use or characterisation of colloidal suspensions requires to adjust and preserve a certain state of dispersion. This typically means that agglomerates and aggregates are broken up into its constituent particles or at least into smallest possible fragments and that a subsequent reagglomeration is avoided. This chapter introduces principles and techniques of dispersion that are relevant for colloidal suspensions. Practical issues are discussed for the dispersion of pyrogenic powders. In addition, the chapter addresses the stability of colloidal suspensions with the focus being on the stability evaluation by analytical techniques. Since most commercial systems consist of multiple particulate components, the chapter finally discusses the stability of binary suspensions.
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Notes
- 1.
Liepe gives a value 0.15, but assumes that \(\tau_{\text{tv}} = \eta \dot{\gamma }_{{\upmu{\text{e}}}}\), which deviates from Eq. (5.6) for laminar shear.
- 2.
It should be noted that McGown & Parfitt (1967) gave a modified definition of the stability ratio, in which the rate of aggregation is not related to that of non-interacting particles (Smoluchowski, Eq. (5.27) but to that of uncharged particles subject to attractive van-der-Waals forces. In this case, the stability ratio differs from factor W in Eq. (5.30).
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Babick, F. (2016). Dispersion of Colloidal Suspensions and Their Stability. In: Suspensions of Colloidal Particles and Aggregates. Particle Technology Series, vol 20. Springer, Cham. https://doi.org/10.1007/978-3-319-30663-6_5
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