  Bicontinuous Pickering emulsions (bijels) are a physically interesting class
of soft materials with many potential applications including catalysis,
microfluidics and tissue engineering. They are created by arresting the
spinodal decomposition of a partially-miscible liquid with a (jammed) layer of
interfacial colloids. Porosity $L$ (average interfacial separation) of the
bijel is controlled by varying the radius ($r$) and volume fraction ($\phi$) of
the colloids ($L \propto r/\phi$). However, to optimize the bijel structure
with respect to other parameters, e.g. quench rate, characterizing by $L$ alone
is insufficient. Hence, we have used confocal microscopy and X-ray CT to
characterize a range of bijels in terms of local and area-averaged interfacial
curvatures. In addition, the curvatures of bijels have been monitored as a
function of time, which has revealed an intriguing evolution up to 60 minutes
after bijel formation, contrary to previous understanding.
