Method for the dispersion of nanoparticles in a fluid, wherein it comprises at least the following steps: - providing an appliance comprising a supporting structure, at least a first disc associated with said supporting structure axially rotatable around a rotation axis and provided with a first flat surface, at least a second disc associated with said supporting structure and provided with a second flat surface, said first disc and said second disc being arranged parallel to one another and substantially closed and said first flat surface and second flat surface being faced and parallel each other to define an interstice, introduction means for introducing inside said interstice and in correspondance to a substantially central portion of said first disc a fluid containing agglomerates of nanoparticles to disperse, operation means operatively associated with said first disc and able to rotate said first disc around said rotation axis, adjustment means for adjusting the distance of at least one of said first and second discs (3, 4) with respect to the other of said first and second discs (3, 4), wherein said adjustment means comprise a screw micrometer adjusting mechanism associated with at least one of said first and second discs (3, 4), and elastic means configured to eliminate the possible play of said adjustment means; - by means of said introduction means, introducing inside said interstice, between said first and second flat surface (3a, 4a), said fluid containing said agglomerate of nanoparticles to disperse; - by means of said operation means, rotate said first disc around said rotation axis to submit said fluid inside said interstice to a complex field of forces, with the purpose of producing cutting forces able to separate said agglomerate of nanoparticles, dispersing the nanoparticles inside said fluid, - by means of said elastic means, pushing at least one of said first and second discs (3, 4) in the direction of the pressure applied by said fluid between the discs themselves, said elastic means being able to eliminate the possible play between screw and nut screw of said screw micrometer adjusting mechanism. - providing an appliance comprising a supporting structure, at least a first disc associated with said supporting structure axially rotatable around a rotation axis and provided with a first flat surface, at least a second disc associated with said supporting structure and provided with a second flat surface, said first disc and said second disc being arranged parallel to one another and substantially closed and said first flat surface and second flat surface being faced and parallel each other to define an interstice, introduction means for introducing inside said interstice and in correspondance to a substantially central portion of said first disc a fluid containing agglomerates of nanoparticles to disperse, operation means operatively associated with said first disc and able to rotate said first disc around said rotation axis, adjustment means for adjusting the distance of at least one of said first and second discs (3, 4) with respect to the other of said first and second discs (3, 4), wherein said adjustment means comprise a screw micrometer adjusting mechanism associated with at least one of said first and second discs (3, 4), and elastic means configured to eliminate the possible play of said adjustment means; - by means of said introduction means, introducing inside said interstice, between said first and second flat surface (3a, 4a), said fluid containing said agglomerate of nanoparticles to disperse; - by means of said operation means, rotate said first disc around said rotation axis to submit said fluid inside said interstice to a complex field of forces, with the purpose of producing cutting forces able to separate said agglomerate of nanoparticles, dispersing the nanoparticles inside said fluid, - by means of said elastic means, pushing at least one of said first and second discs (3, 4) in the direction of the pressure applied by said fluid between the discs themselves, said elastic means being able to eliminate the possible play between screw and nut screw of said screw micrometer adjusting mechanism.