Physico‐chemical studies on the application of insecticides to sheep fleece. VII.—The influence of cationic wetting agent‐fleece reactions on the stability of emulsions and suspensions

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Abstract
A study is made of the stability of dilute xylene‐water emulsions, and DDT‐water suspensions, when cationic wetting agents (of chain length in the range dodecylpyridinium to octadecylpyridinium, and with various halide ions) are employed. Emulsions are in general stable over a narrow concentration range only, and reasons for this are given. The variations in stability which result from the introduction of natural fleece are discussed, and the factors responsible for this are classified. The deposition of oil phase or suspended solid on fleece under various conditions has been measured, and the results are interpreted in the light of these factors.