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Theoretical studies of the influence of nanoparticle dopants on the ferroelectric properties of a ferroelectric liquid crystal
Journal of Molecular Liquids ( IF 6 ) Pub Date : 2018-01-06 , DOI: 10.1016/j.molliq.2018.01.013
S. Shoarinejad , R. Mohammadi Siahboomi , M. Ghazavi

Recently, ferroelectric liquid crystals (FLCs) doped with nanoparticles have received extensive interest owing to their fascinating fundamental and technological perspectives. The purpose of this paper is to present our theoretical attempt to study the effects caused by ferroelectric nanoparticles on the properties of a ferroelectric liquid crystal. Our study is based on an extended thermodynamic model of the ferroelectric smectic C (SmC*) phase near the transition to the corresponding smectic A (SmA) phase. We have used the modified Landau free energy, developed for statistical mechanics of the spherical nanoparticles immersed in a FLC medium. The response time of the FLC dispersed ferroelectric nanoparticles is investigated under an applied electric field. The rotational viscosity is also calculated with the possible variation in temperature and the nanoparticle concentration. The obtained results, for the goldstone mode, show a faster response time for the nanodoped system as compared to the pure one. Moreover, a remarkable difference between the rotational viscosities of the pure and doped systems is observed. The variations of polarization and tilt angle are calculated as well. The obtained results for both pure and nanodoped FLC system, near the transition temperature, show the influence of dispersed ferroelectric nanoparticles on the FLC polarization and confirm that the tilt angle is not significantly affected by the presence of the particles. Also, slightly lower spontaneous polarization is revealed for a ferroelectric nanodoped system. Calculations based on this model show a good agreement with the recent experimental findings.



中文翻译:

纳米粒子掺杂剂对铁电液晶铁电性能影响的理论研究

近来,掺杂有纳米粒子的铁电液晶(FLC)由于其引人入胜的基础和技术观点而受到广泛关注。本文的目的是介绍我们的理论尝试,以研究铁电纳米颗粒对铁电液晶性能的影响。我们的研究基于铁电近晶C(SmC *)相向相应近晶A(SmA)相过渡附近的扩展热力学模型。我们使用了改良的Landau自由能,该自由能是为浸没在FLC介质中的球形纳米粒子的统计力学而开发的。在电场作用下研究了FLC分散的铁电纳米颗粒的响应时间。还通过温度和纳米颗粒浓度的可能变化来计算旋转粘度。对于金石模式,所获得的结果显示出与纯掺杂系统相比,纳米掺杂系统的响应时间更快。此外,观察到纯体系和掺杂体系的旋转粘度之间的显着差异。偏振和倾斜角的变化也被计算出来。对于纯的和纳米掺杂的FLC系统,在转变温度附近获得的结果显示了分散的铁电纳米颗粒对FLC极化的影响,并证实了倾斜角不受颗粒存在的影响。而且,对于铁电纳米掺杂系统,显示出较低的自发极化。

更新日期:2018-01-06
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