Liquid crystal nanocomposites produced by mixtures of hydrogen bonded achiral liquid crystals and functionalized carbon nanotubes

18th International School on Condensed Matter Physics: "Challenges of Nanoscale Science: Theory, Materials, Applications"

Katranchev, B.^1 ; Petrov, M.^1 ; Keskinova, E.^1 ; Naradikian, H.^1 ; Rafailov, P.M.^1 ; Dettlaff-Weglikowska, U.^2 ; Spassov, T.^3

Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., Sofia

1784, Bulgaria^1

School of Electrical Engineering, Korea University, Anam-Dong, Sungbuk-Gu Seoul

136713, Korea, Republic of^2

Faculty of Chemistry and Pharmacy, University of Sofia St. Kl. Ohridski, 1 James Bourchier blvd., Sofia

1164, Bulgaria^3

关键词: Functionalized carbon nanotubes;    Functionalized nanotubes;    Liquid crystalline;    Liquid crystalline state;    Molecular modification;    Non-covalent interaction;    Non-mesogenic compounds;    Singlewalled carbon nanotube (SWCNT);   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/558/1/012024/pdf
DOI  :  10.1088/1742-6596/558/1/012024

来源: IOP

【 摘 要 】

The liquid crystalline (LC) nature of alkyloxybenzoic acids is preserved after adding of any mesogenic or non-mesogenic compound through hydrogen bonding. However, this noncovalent interaction provokes a sizable effect on the physical properties as, e. g. melting point and mesomorphic states. In the present work we investigate nanocomposites, prepared by mixture of the eighth homologue of p-n-alkyloxybenzoic acids (8OBA) with single-walled carbon nanotubes (SWCNT) with the purpose to modify the optical properties of the liquid crystal. We exercise optical control on the LC system by inserting SWCNT specially functionalized by carboxylic groups. Since the liquid crystalline state combines order and mobility at the molecular (nanoscale) level, molecular modification can lead to different macroscopical nanocomposite symmetry. The thermal properties of the functionalized nanocomposite are confirmed by DSC analyses. The mechanism of the interaction between surface-treated nanoparticles (functionalized nanotubes) and the liquid crystal 8OBA bent- dimer molecules is briefly discussed.