https://doi.org/10.1140/epje/s10189-023-00263-0
Regular Article - Soft Matter
Impact of core polarity on smectic B-induced hydrogen bond liquid crystals
1
Department of Physics, Condensed Matter Research Laboratory (CMRL), Research Park, Bannari Amman Institute of Technology, 638 401, Sathyamangalam, Tamilnadu, India
2
Department of Physics, Anna University Engineering College, 623 513, Ramanathapuram, India
3
Department of Physics, Sona College of Technology, 636 005, Salem, Tamil Nadu, India
4
Department of Physics (DDE), Annamalai University, 608002, Annamalainagar, India
Received:
25
November
2022
Accepted:
25
January
2023
Published online:
13
February
2023
The novel series of hydrogen bond liquid crystals were synthesized from the 2-methylglutaric acid (MGA) and 4-alkyloxybenzoic acid (nOBA) compounds. The induced smectic B phase with different texture (spine texture, needle texture, mosaic texture, natural mosaic texture and marble texture) were identified by polarizing optical microscope. Due to breaking of in-plane rotational symmetry within molecular layers, smectic B phase is tempted by suppressing other usual mesophases. The mesomorphic transition temperature, enthalpy and entropy values were calculated by differential scanning calorimeter which strongly proves the existence of mesomorphism. H-bond interaction and functional groups were confirmed by the observed peak between 2910 and 2954 cm−1 in the FTIR spectra. Thermal stability and extended mesophase width (for MGA + 12OBA = 31.1) of Sm B mesophase were reported and it clearly reveals the existence of mono-phase variance in the MGA + nOBA HBLC complex. Due to the steric effect, and the increased molecular core polarity, the highly stabilized Sm B phase with different textures were observed while varying alkyloxy carbon number n = 7 to 12. Further, the origination of Sm B phase and its detailed characteristics were reported.
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