Impact of Co-doped TiO2 nanoparticles on the physical properties of a nematic liquid crystal

被引：1

作者：

Alaya, Soumaya ^{[1
]}

Ayeb, Habib ^{[1
]}

Samet, Lolwa ^{[2
]}

Jomni, Fathi ^{[3
]}

Soltani, Taoufik ^{[1
]}

机构：

[1] Univ Tunis El Manar, Fac Sci Tunis, LR99ES16, Lab Phys Matiere Molle & Modelisat Electromagnet, Tunis, Tunisia

[2] Ctr Rech & Technol Energie, Technopole Borj Cedria, Lab Nanomat & Syst Energies Renouvelables, BP 95, Hammam Lif, Tunisia

[3] Univ Tunis El Manar, Lab Mat Org & Proprietes, LR99ES17, Tunis, Tunisia

来源：

PHASE TRANSITIONS | 2024年 / 97卷 / 4-5期

关键词：

Nematic liquid crystal; ferroelectric nanoparticles; response time; electro optical; dielectric anisotropy; BIREFRINGENCE PROPERTY; PARAMETERS; BEHAVIOR; PERFORMANCE; DISPERSION;

D O I：

10.1080/01411594.2024.2313736

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

We have studied the electro-optical properties of the 4-pentyl-4-biphenylcarbonitrile nematic liquid crystal also known as 5CB doped by 0.5%wt of pure and cobalt-incorporated TiO(2 )nanoparticles. The obtained results show that the effect of the NPs on the electrooptical properties is mainly due to the modification of the dielectric and the viscoelastic properties of the nematic in the presence of the NPs. Furthermore, the nematic isotropic transition temperature of all doped samples remained almost unchanged. This indicates that the order parameter was almost unchanged too. A significant decrease in the dielectric anisotropy and the splay elastic constant was observed. The rotational viscosity has been deduced from response time data; it was found that rotational viscosity shows a significant increase for cobalt-incorporated TiO2 . However, the rotational viscosity was decreased for pure TiO2 nanoparticles compared to pure 5CB.

引用

页码：276 / 288

页数：13

共 59 条

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