Recently, we have prepared highly active carbon catalysts for the oxygen reduction reaction in hydrogen fuel cells. These materials are synthesized easily by mixing metal nitrates with gelatin. Heating to ~80 °C results in formation of a foam, which is then converted to carbon if heated to 800 °C under nitrogen gas. The formation of the foam is a fascinating process, particularly since the structure can be changed dramatically with different metals, or with simple changes of pH. Furthermore, combinations of metals, such as iron and magnesium, can be used to create foams with very small 'bubble' size. The gel structure of gelatin in water is well understood. Gelatin molecules form triple helical 'junctions', locking together the individual polymer strands. SANS will allow us to study how metals change the structure of the gelatin, and why this has such a dramatic effect on foaming.