A system for the treatment of materials, to be selected from between materials in a fluid state (1) and particles suspended in a fluid material (1), comprising at least one upper kinematic pair equipped with two mechanical elements (2a, 2b; 2a, 2c), said kinematic pair being in contact with a material in a fluid state (1) or with particles suspended in a fluid material (1); motor means (5) to generate a pre-set relative velocity (v) between the elements (2a, 2b; 2a, 2c) of said kinematic pair, and tensioning means (8) to subject said kinematic pair to a pre-set pressure (P).