Nanoconfined chemical systems are abundant in terrestrial environments. In this chapter, we define an interfacial system as nanoconfined when it measures less than 1000 nm in at least one dimension. Considering the effects of nanoconfinement on surface reactivities is crucial for accurately predicting the fate and transport of chemical species in the environment, where nanoscale pores and thin films on surfaces are prevalent (Fig. 1). Various nanoconfined geometries can exist in nature, including pores/cages (3-D confinement), channels (2-D confinement) and slits (1-D confinement). Because the influence of geometry has yet to be clearly quantified, in this chapter we...
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