4:15 PM - 4:30 PM
▼ [20p-A304-12] Electrocaloric Effect in Nematic Liquid Crystal
Keywords:electrocaloric effect, liquid crystals
Electrocaloric (EC) effect has been attracted worldwide attention in the past few years due to its great potential in the next-generation cooling technology. Comparing with traditional cooling solutions, EC cooling has advantages including vapor-free, no carbon emission, and high energy efficiency. Some prototypes of EC cooling systems based on solid ferroelectric materials have been proved to have great potential. However, the theoretical approach of EC effect in liquid crystal has not been clearly explored. Therefore, a numerical model which can describe the EC performance in liquid crystals is still required.
In this work, the EC effect of nematic liquid crystals has been studied using the Landau-de Gennes method. The proposed model describes the entropy difference generated by EC effect under specific temperature and electric fields. We employed an indirect measurement setup using the Sawyer-Tower circuit. The entropy change driven by EC effect can be obtained from the P-E loop measurement using the Maxwell relations.The EC effect in 5CB is investigated by the experiment and the numerical methods. For different electrical fields, the peak values of the EC effect of 5CB are in good accordance with the present experimental data, showing the validity of present method for predicting the EC effect of liquid crystal.
In this work, the EC effect of nematic liquid crystals has been studied using the Landau-de Gennes method. The proposed model describes the entropy difference generated by EC effect under specific temperature and electric fields. We employed an indirect measurement setup using the Sawyer-Tower circuit. The entropy change driven by EC effect can be obtained from the P-E loop measurement using the Maxwell relations.The EC effect in 5CB is investigated by the experiment and the numerical methods. For different electrical fields, the peak values of the EC effect of 5CB are in good accordance with the present experimental data, showing the validity of present method for predicting the EC effect of liquid crystal.