Null transmission ellipsometry has been employed to study the molecular arrangements in freestanding films of two no-layer-shrinkage liquid crystal homologous compounds above the bulk smectic A -smectic C* (Sm C*) transition temperature. An unusual nonplanar-parallel or nonplanar-antiparallel- parallel transition has been observed in both compounds under a proper electric field. With the addition of one CH2 group, while the Sm C* phase is more stable thermally, the magnitude of the critical field needed to induce a parallel-antiparallel transition decreases dramatically.
|Original language||English (US)|
|Journal||Physical Review E - Statistical, Nonlinear, and Soft Matter Physics|
|State||Published - Sep 28 2006|