“…Also, they can be prepared in different sizes and shapes, including thin films, monoliths, membranes and powders [33,[80][81][82]. In addition, the mild conditions used in this process make it suitable for the immobilization of such different species as dyes [83], metal complexes [18,21,32] and even proteins [84,85]. Compared with silica gel, this method may allow for a larger load of complex since the entrapment is not limited by the density of functional groups, as in the case of the silica surface.…”