Nanofoams are a class of nanostructured, porous materials (foams) containing a significant population of pores with diameters less than 100 nm. Aerogels are one example of nanofoam.
Reference : Ultralow-Density Nanostructured Metal Foams: Combustion Synthesis, Morphology, and Composition
It is the average number of times the nanotechnology articles published within a year have been cited in the Journal Citation Reports.
The indicator shows the number of nanotechnology patents applications published (but not yet granted) in USPTO. According to ISO/TS 18110 (First Edition 2015-08-15), the definition of nanotechnology patents is “patents that include at least one claim related to nanotechnology or patents classified with an IPC classification code related to nanotechnology such as B82.