Thermodynamic and surface characterisation of 4-[4-((S)-citronellyloxy)benzoyloxy]benzoic acid thermotropic liquid crystal

The selectivity of 4-(Decyloxy) benzoic acid (DBA) liquid crystal in surface adsorption region (303.2 -328.2 K) and thermodynamic region (423.2 -433.2 K) was investigated by inverse gas chromatography at infinite dilution (IGC-ID). The selectivity parameters of the structural isomer series named butyl acetate, butyl alcohol and amyl alcohol series were calculated for the DBA using IGC-ID technique. Additionally, the surface properties including dispersive surface energy (γ S D ), free energy (∆G A S ), enthalpy (∆H A S ), and acidity-basicity constants were calculated with net retention volumes obtained from IGC-ID experiment results. When the ∆H A S and ∆G A S constants, DBA surface was found to be an acidic character (K D /K A ≅ 0.89).

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“…When the studies are carried out at different temperatures, ∆H A S and ∆S A S values can be calculated as follows [50]:…”

Section: Surface Propertiesmentioning

confidence: 99%

Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

2021

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“…During the last 50 years IGC has been known physicochemical info source for assorted non-volatile substances [9][10][11][12][13]. Recently, application of IGC method in investigation of thermodynamic properties seems to be particularly attractive.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel 4-benzyloxyphenyl 4-[4-(n-dodecyloxy) benzoyloxy]benzoate liquid crystal

Balkanli¹,

Çakar²,

Ocak³

et al. 2021

Turk J Chem

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Liquid crystal (LC) compound 4-Benzyloxyphenyl 4-[4-(ndodecyloxy)benzoyloxy]benzoate (BDBB) has been prepared and characterized. Inverse gas chromatography (IGC) was reported as a beneficial analysis for the research of thermodynamic characteristics of the new LC. Acetate and alcohol isomers were used to examine LC selectivity via IGC technique between 333.2 K and 483.2 K. The retention diagrams of n-heptane, n-octane, n-nonane, n-decane, undecane, dodecane, tridecane, nbutyl acetate, isobutyl acetate, ethyl acetate, n-propylbenzene, isopropylbenzene, ethylbenzene, chlorobenzene and toluene on BDBB were plotted with temperature 2 between 483.2-493.2 K. Flory-Huggins interaction parameter and weight fraction activity coefficient at infinite dilution were researched for BDBB.

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“…[1][2][3][4][5] LCs have been recently used as a stationary phase in gas or liquid chromatography methods for studying their physicochemical properties and analytical performances in the separation and detection of components of mixtures. [6][7][8][9][10] LCs are dynamically responsive anisotropic materials whose ordering and orientational alignment can be tuned and changed by the external electrical, magnetic, thermal, chemical, or biological stimulus. A change in the chemical environment can therefore lead to the changes in the molecular ordering of LCs aligned on the surface at a given temperature and applied external electric field.…”

Section: Introductionmentioning

confidence: 99%

“…The word 'inverse' suggests that the chromatographic column's stationary phase is an unknown non-volatile material being tested, and its properties are calculated based on the retention behavior of carefully selected test solvent. [6,[50][51][52] The IGC technique has been used to determine the solute-solvent interaction degree in terms of thermodynamics and surface properties and therefore can be used to predict the selectivity of the sensor. [53][54][55] Therefore, in this study, to determine the surface and acid-base character of LC-based films and the degree of interaction between LC and various organic solvents, the studies have been carried out by the IGC technique.…”

Section: Introductionmentioning

confidence: 99%

“…Liquid crystals (LCs) and polymer‐dispersed liquid crystal (PDLC) films are very attractive materials and used intensively for a variety of industrial applications such as electro‐optical displays and sensors [1–5] . LCs have been recently used as a stationary phase in gas or liquid chromatography methods for studying their physicochemical properties and analytical performances in the separation and detection of components of mixtures [6–10] …”

Section: Introductionmentioning

confidence: 99%

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Liquid Crystal Entrapped Porous Films for Ammonia Sensing and Determination of Surface Properties of Liquid Crystal Molecule

2021

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A highly ordered porous film was fabricated by the sol-gel process using 3-mercaptopropyltrimethoxysilane (MPTMS) precursor and polystyrene microspheres template. The liquid crystal (LC) (4-(Octyloxy) benzoic acid) (OBA) was entrapped into the voids of the pre-fabricated porous structure to obtain sensing materials that were characterized by scanning electron microscope (SEM) and fourier transform infrared spectroscopy (FT-IR). The impedance of the films was measured and the capacitive reactance response (1/-X) of LC-based sensor exhibited satisfactory linear correlation (R 2 = 0.9994) with the concentration of ammonia up to 50 ppm with a limit of detection (LOD) and quantification of 1.2 ppm and 4.0 ppm, respectively. The sensor exhibited high selectivity to ammonia compared to the different classes of solvent vapors, and satisfactory repeatability (RSD = 4 %) and response time (10 min). Also, inverse gas chromatography (IGC) was used to confirm the acidic surface behavior of LC and its selectivity to ammonia. The results proved that the studied LC-based sensor may be promise candidate for sensitive and selective determination of ammonia.

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Thermodynamic and surface characterisation of 4-[4-((S)-citronellyloxy)benzoyloxy]benzoic acid thermotropic liquid crystal

Cited by 17 publications

References 37 publications

Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

Synthesis and characterization of novel 4-benzyloxyphenyl 4-[4-(n-dodecyloxy) benzoyloxy]benzoate liquid crystal

Liquid Crystal Entrapped Porous Films for Ammonia Sensing and Determination of Surface Properties of Liquid Crystal Molecule

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