Mesophase

Mobile ions in mesophases are either orientationally or rotationally disordered while their centers are located at the ordered sites in the crystal structure.

[1][2] Georges Friedel (1922) called attention to the "mesomorphic states of matter"[3] in his scientific assessment of observations of the so-called liquid crystals.

From early liquid crystal displays the buying public has embraced the low-power optical switch facility of mesophases with director.

Mesophases occur before then when an intermediate state of order is still maintained as in the nematic, smectic, and columnar phases of liquid crystals.

The response of the director to the field is expressed with viscosity parameters, as in the Ericksen-Leslie theory in continuum mechanics developed by Jerald Ericksen and Frank Matthews Leslie.