Measurement system and method of electric permittivity at 0 hz

A measurement method (100) of electric permittivity (ε) at 0 Hz of a substance (1), irrespective of its aggregation state, comprising the steps of:

• pre-arranging (101) a rheometer (2) comprising an electrorheology module (20), said electrorheology module (20) being provided with a first plate (21) and a second plate (22) parallel each other, said first plate (21) being fixed and said second plate (22) being movable, said rheometer (2) further comprising a force sensor (23) operatively connected to said second plate (22) and configured to measure a normal force (F) to which said second plate (22) is subjected;
• connecting (102) a voltage generator (3) to said rheometer (2), said voltage generator (3) being configured to impose a potential difference (ΔV) at 0 Hz between said first plate (21) and said second plate (22) in a range between a minimum potential difference (ΔVmin) and a maximum potential difference (ΔVmax);
• placing (103) the substance (1) between said first plate (21) and said second plate (22);
• arranging (104) said second plate (22) at a known distance (D) from said first plate (21);
• imposing (105), by means of said voltage generator (3), said potential difference (ΔV) at 0 Hz between said first plate (21) and said second plate (22);
• measuring (106), by means of said force sensor (23), the normal force (F) to which said second plate (22) is subjected;
• and
• converting (108) said normal force (F) to obtain said electric permittivity (ε) of the substance (1).