Thermal and mesomorphic properties of ternary mixtures of some hydrogen-bonded liquid crystals

Abstract

The thermal and mesophase behaviour of ternary mixtures formed from hydrogen-bonded nematic liquid crystals 4-hexylbenzoic acid, 4-(octyloxy)benzoic acid and 4-(decyloxy)benzoic acid were investigated by differential scanning calorimetry (DSC) and phases identified by polarised optic microscopy (POM). The DSC and POM results clearly indicate that the produced mixtures display liquid crystalline properties. The phase transition temperature values obtained in the DSC experiments are in line with the POM observations. Investigation of the thermal properties of ternary mixtures reveals that the nematic range of the produced mixtures is affected in a way that is dependent on both the mixture ratio and the difference in the alkyloxy chain lengths. Furthermore, the phase transition temperature values of ternary mixture increase with increasing heating rate, and the calculated activation energy values show that the reaction arising during the phase transitions of the mixture is regular.

Optical, Thermal Studies on Binary and Ternary Hydrogen-Bonded Liquid Crystal Complexes

“…In order to exploit these materials in device applications, it should possess low melting point and exhibit a wide range LC phases. The thermal and mesophase behavior of ternary complex formed from hydrogenbonded nematic liquid crystals reveal that the nematic ranges of the produced mixtures are affected in a way that is dependent on both the mixture ratio and the difference in the alkyloxy chain lengths [29]. The asymmetrically substituted benzene derivative with biphenyl moiety shows a low melting point [30].…”

Image enhancement using virtual contrast image fusion on Fe3O4and ZnO nanodispersed decyloxy benzoic acid

“…Many studies are carried out on nano materials involved in modern technologies like display devices. Including image analysis, recently several researchers [1][2][3][4][5][6][7] carried out different studies on number of hydrogen-bonded liquid crystal (LC) materials. Here, the authors made an attempt to study the textural enhancement of Fe 3 O 4 and ZnO nano-dispersed decyloxy benzoic acid.…”

Induced Phases of New H-bonded Supramolecular Liquid Crystal Complexes; Mesomorphic and Geometrical Estimation

“…The concept of Supramolecular liquid crystals has been successively applied for potential wide applications in scientific and technological fields [1][2][3][4][5]. Nowadays, thermotropic hydrogen-bonded (H-bonded) liquid crystal complexes show great potential and are attracting interest [6][7][8][9][10][11][12][13][14][15]. Many hydrogen-bonded systems based on pyridine (as hydrogen acceptor) and carboxylic acid (as the hydrogen donor) have been studied and characterized extensively [16][17][18][19][20][21][22].…”

“…There is a different approach in which can control the molecular shape using H-bonding [23][24][25][26][27][28]. Most of the SMHLCs studied are based on the rod-like intermolecular H-bonding [10,[12][13][14][29][30][31] and there is a lot of interest towards the formation of angular supramolecular hydrogen-bonded liquid crystals [9]. On the other hand, the Schiff base and azo moiety are of special interest due to their ability for trans/cis isomerization upon UV light irradiations [7,[32][33][34][35].…”