Triple Line Phenomena: In gas/liquid/solid systems the triple line is defined by the gas/liquid, gas/solid and liquid/solid boundaries at the triple point (the point where these three boundaries meet). The behaviour of the triple line is determined by the properties (e.g. density, viscosity) of the gas, solid and liquid phase as well as the interactions (e.g. surface tension, friction) between these three phases. Understanding of the governing properties of the phases and interactions between these phases can give rise to novel mechanisms for structuring and processing multi-phase systems (e.g. foams, emulsions, sprays, particulate systems, suspensions). 

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