Dielectric and electro-optical properties of nematic liquid crystal p-methoxybenzylidene p-decylaniline dispersed with oil palm leaf based porous carbon quantum dots
التفاصيل البيبلوغرافية
العنوان:
Dielectric and electro-optical properties of nematic liquid crystal p-methoxybenzylidene p-decylaniline dispersed with oil palm leaf based porous carbon quantum dots
The effect of dispersing oil palm leaf-based porous carbon quantum dots (OPL QDs) in nematic liquid crystal p-methoxybenzylidene p-decylaniline (MBDA) has been studied in this paper. The dielectric properties were measured with and without bias voltage as a function of frequency and temperature. Electro-optical parameters like response time, rotational viscosity and birefringence have also been studied with respect to temperature and OPL QDs concentration. The main findings show that when the dispersion of OPL QDs increases, the sign of dielectric anisotropy changes. Fall time has been found to be faster than the rise time for pure MBDA, composites 1 and 2, while composites 3 to 5 have faster rise time than fall time. This has been due to a change in the sign of dielectric anisotropy that begins from composite 3. UV-VIS absorbance and photoluminescence studies have been carried out which demonstrates the existence of π–π* transition. The remarkable outcomes of this work can be applied in the display and photonics field. Dielectric and electro-optical characterization has been reported for MBDA-OPL composite systems. Reversal in the sign of dielectric anisotropy starts from composite 3. Faster response with reduced rotational viscosity has been revealed.
