  Field-induced reorientation of colloidal particles is especially relevant to
manipulate the optical properties of a nanomaterial for target applications. We
have recently shown that surprisingly feeble external stimuli are able to
transform uniaxial nematic liquid crystals (LCs) of cuboidal particles into
biaxial nematic LCs. In the light of these results, here we apply an external
field that forces the reorientation of colloidal cuboids in nematic LCs and
sparks a uniaxial-to-biaxial texture switching. By Dynamic Monte Carlo
simulation, we investigate the unsteady-state reorientation dynamics at the
particle scale when the field is applied (uniaxial-to-biaxial switching) and
then removed (biaxial-to-uniaxial switching). We detect a strong correlation
between the response time, being the time taken for the system to reorient, and
particle anisotropy, which spans from rod-like to plate-like geometries.
Interestingly, self-dual shaped cuboids, theoretically considered as the most
suitable to promote phase biaxiality for being exactly in between prolate and
oblate particles, exhibit surprisingly slow response times, especially if
compared to prolate cuboids.
