Method for depositing nanoobjects on the surface of a gel comprising a polymeric matrix comprising at least two contiguous zones with distinct rigidities, said method comprising the steps of: a) providing a gel comprising a polymeric matrix and a solvent in the polymeric matrix, the polymeric matrix forming a three-dimensional lattice able to swell in the presence of said solvent, where the solubility of the polymeric matrix at 1 bar and 25°C in the solvent is less than 1 g/L, the polymeric matrix comprising at least two contiguous zones with distinct rigidities having a rigidity gradient greater than or equal to 0.1 kPa/μm, then b) depositing nanoobjects the mean diameter of which is from 1 to 1000 nm, measured in accordance with the method described in the description, on the surface of the gel, then c) evaporating the solvent from the gel at least until the variation in the degree of evaporation of the solvent in the at least one least rigid zone of the gel is not constant over time, by means of which the nanoobjects migrate towards the at least one most rigid zone of the gel and a gel is obtained the surface of which is at least partially coated with nanoobjects, and where the surface density of nanoobjects of at least one most rigid zone among the at least two contiguous zones is greater than that of at least one least rigid zone among the at least two contiguous zones, the determination of said at least until the variation in the degree of evaporation of the solvent of the at least one least rigid zone of the gel is not constant over time being implemented in accordance with the method described on page 10 line 10 to page 11 line 4 of the description; and said nanoobjects being selected from polysaccharides, proteins, peptides and mixtures thereof, and the metal nanoparticles and said nanoobjects not being cells. a) providing a gel comprising a polymeric matrix and a solvent in the polymeric matrix, the polymeric matrix forming a three-dimensional lattice able to swell in the presence of said solvent, where the solubility of the polymeric matrix at 1 bar and 25°C in the solvent is less than 1 g/L, the polymeric matrix comprising at least two contiguous zones with distinct rigidities having a rigidity gradient greater than or equal to 0.1 kPa/μm, then b) depositing nanoobjects the mean diameter of which is from 1 to 1000 nm, measured in accordance with the method described in the description, on the surface of the gel, then c) evaporating the solvent from the gel at least until the variation in the degree of evaporation of the solvent in the at least one least rigid zone of the gel is not constant over time, by means of which the nanoobjects migrate towards the at least one most rigid zone of the gel and a gel is obtained the surface of which is at least partially coated with nanoobjects, and where the surface density of nanoobjects of at least one most rigid zone among the at least two contiguous zones is greater than that of at least one least rigid zone among the at least two contiguous zones, the determination of said at least until the variation in the degree of evaporation of the solvent of the at least one least rigid zone of the gel is not constant over time being implemented in accordance with the method described on page 10 line 10 to page 11 line 4 of the description; and <EOS>