This is probably because a large complex is formed as a whole through the interaction of the liquid crystal molecules with X molecules which are dispersed in the liquid crystal; consequently, its radius increased.
It is presumed that a complex was formed on the whole by interaction of liquid crystal molecules with X molecules dispersed in the liquid crystal, and therefore the radius got increased.
This is probaly that dispersed X molucle in liquid crystal intercacts with liquid crystal molucle, as a whole large composite is formed, as aresult its radius is augumented.