Influence of modified detonation nanodiamonds on electrooptical properties of nematic liquid crystals

3rd International School and Conference on Optoelectronics, Photonics, Engineering and Nanostructures (Saint Petersburg OPEN 2016)

Vashkevich, Vera^1 ; Lapanik, Valeri^2 ; Minko, Anatoly^1

Belarusian State University, Minsk

220030, Belarus^1

Institute of Applied Physics Problems, Belarusian State University, Minsk

220045, Belarus^2

关键词: Carboxylate groups;    Detonation nanodiamonds;    Dielectric anisotropies;    Electrooptical properties;    Functionalized;    Nanoparticle (NPs);    Nematic liquids;    Organic molecules;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/741/1/012014/pdf
DOI  :  10.1088/1742-6596/741/1/012014

来源: IOP

【 摘 要 】

To modify the structure of detonation nanodiamonds (DNDs) several carboxylate groups were added to DNDs. Activation of COOH-surface functionalized groups allowed attaching of various organic tails to molecules. It was investigated that dielectric and electrooptical properties of nematic liquid crystalline mixtures (LCMs) doped with modified DNDs (MDNDs). It is established that the effect of DNDs on mesomorphic, dielectric and electrooptical properties depends on the size of nanoparticles (NPs) and the type of tail-like organic molecules grafted to DNDs. It is found that NPs of a small size (5-6 nm) do not significantly affect on the parameters of LCMs. At the same time conglomerates of a larger size (50 and 100 nm) depending on the tails polarity can increase or decrease the dielectric anisotropy and response time of LCMs in about 1.2-1.4 times.