# Pickering emulsion

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- Unless particles very significantly prefer one phase over the other, they will tend to be irreversibly adsorbed at the interface between the two fluids. This potential energy well is due to the reduced bare surface area in contact between the two fluids, and is given by $\pi R^{2} \gamma_{12}(1+cos\theta)^{2}$, where R is the particle radius, $\gamma$ is the interfacial tension between the two fluids, and $\theta$ is the contact angle at the particle surface. For contact angles between ~20-160 degrees, this is many times larger than kT.