Abstract
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.
Highlights
Dispersion of different NPs aimed to improve electro-optical properties of liquid crystals (LCs) have attracted attention of many researchers in recent years [1,2,3,4]
The authors suppose that the improvement of properties of ferroelectric LCs (FLCs) doped with metal NPs is due to the appearance of particles dipole moment, which is explained by their interaction with LC molecules
The authors of this paper propose two mechanisms of Ti NPs interaction with nematic LCs (NLCs) molecules
Summary
Dispersion of different NPs aimed to improve electro-optical properties of liquid crystals (LCs) have attracted attention of many researchers in recent years [1,2,3,4]. Ag NPs didn’t improve the characteristics of FLCs due to the low activity of Ag which is located almost in the end of the series of chemical activity of metals. The research of Ni particles with a size of 2-8 nm and a concentration of 0.5% showed that the optical transmittance improved and the optical response time of FLCs reduced [2]. The authors suppose that the improvement of properties of FLCs doped with metal NPs is due to the appearance of particles dipole moment, which is explained by their interaction with LC molecules (the dipole moment of Ni NPs is 10 Debye [2]). Ni NPs aligned with force lines, attracting LCs, which affected on the temporal characteristics of LCs and promoted better light transmission
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