A generalized solid state kinetic expression for reaction interface-controlled reactivity

The generalized conversion function will always start at a value of one, making interpretation and direct comparison of any active surface area (ASA) progression possible. Visual observations indicate the growth of defect structures within the macro graphite flakes, leading to an increase in ASA. This leads to a behaviour resembling nucleation and growth, despite the interface-controlled reaction taking place on a disc-shaped solid. The random nature of the oxidized flake microstructure makes it difficult to develop representative analytical models for this behaviour.