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Study Of Crystal Morphologies Of Hydrogenated Castor Oil As A Rheology Modifier, Dingzheng Yang McMaster University

Study Of Crystal Morphologies Of Hydrogenated Castor Oil As A Rheology Modifier, Dingzheng Yang

Open Access Dissertations and Theses

Hydrogenated castor oil (HCO) crystals as a rheology modifier have been widely used in paints, cosmetics and household products. In this thesis, we are interested in the effect of crystal morphology on the suspension rheology of products. Three major types of micron-sized crystal morphologies have been observed: fiber, rosette and irregular crystal. Fibers show a high aspect ratio with the length ranging from 5 to 33 µm and width around 1~3 µm. The rosette (2~50 µm) is a three-dimensional spherulitic structure with nano-fibrous arms extruding from a heterogeneous central point. Irregular crystals with equivalent diameter ranging from 4 ...