A study of the thermodynamical interactions with solvents and surface characterisation of liquid crystalline 5-(( S )-3,7-dimethyloctyloxy)-2-[[[4-(dodecyloxy)phenyl]imino]-methyl]phenol by inverse gas chromatography

Ocak, Hale; Mutlu-Yanic, Serap; Çakar, Fatih; Bilgin‐Eran, Belkız; Güzeller, Dilek; Karaman, Ferdane; Cankurtaran, Özlem

doi:10.1016/j.molliq.2016.09.002

Cited by 28 publications

(15 citation statements)

References 21 publications

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“…Within this study, the surface properties and acid-base constants of the sample analyzed using the IGC technique were determined between 303.2 and 328.2 K. The theoretical part and the details of the technique for determining the surface properties with IGC have been explained in our previous studies. [66,67] The retention of polar and non-polar solvents used in the study, in volatile form, on the material was examined, the net retention volumes were calculated from the data obtained and retention diagrams were drawn in the light of the latest data and were given in Figure S3 and S4.…”

Section: Igc Resultsmentioning

confidence: 99%

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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Section: Igc Resultsmentioning

confidence: 99%

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

2021

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“…In the Ocak's et al article was described that the retention times were determined at 373.2 -398.2K [49]. However, the dispersive The phase transition Cr-SmC * of the DODPIMP compound is equal to 326.4K.…”

Section: Acceptor-donor Characteristicmentioning

confidence: 99%

An Attempt to Chromatographic Determination of Acceptor-Donor Properties of Liquid Crystals

Grajek¹,

Purchała²

2017

J Chromatogr Sep Tech

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“…The difference between the retention times of two solvents obtained under the same condition determines the selectivity of the stationary phase. 36 This selectivity is called as selectivity coefficient, α, which is defined the ratio of values of two solvent peaks 12 :…”

Section: The Selectivity Coefficientmentioning

confidence: 99%

“…The difference between the retention times of two solvents obtained under the same condition determines the selectivity of the stationary phase 36 . This selectivity is called as selectivity coefficient, α , which is defined the ratio of values of two solvent peaks 12 :

α = \frac{V_{g_{1}}^{0}}{V_{g_{2}}^{0}} = \frac{((), t_{R_{2}} - t_{A})}{(t_{R_{1}} - t_{A})} .

The bigger this ratio, the better is the selectivity of the stationary phase for the solvent pair of the solvents.…”

Section: Inverse Gas Chromatography Theorymentioning

confidence: 99%

Synthesis and thermodynamic characterization of poly(methyl methacrylate)/multiwall carbon nanotube nanocomposite

Çakar

2020

Surface & Interface Analysis

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In the first part of this study, poly(methyl methacrylate) (PMMA)/multiwall carbon nanotube (MWCNT) nanocomposite was synthesized by adding carbon nanotube before polymerization with bulk polymerization. Surface morphology of the PMMA/MWCNT nanocomposite and the PMMA/MWCNT nanocomposite with Chromosorb W was characterized by scanning electron microscopy (SEM). Surface and thermodynamic properties of the PMMA/MWCNT nanocomposite were investigated by inverse gas chromatography (IGC). The surface acid base character and dispersed surface energy γSD of the PMMA/MWCNT were determined at infinite dilution. The entropy of adsorption, ∆SS, the specific free energy of adsorption, ∆GS, and the enthalpy of adsorption, ∆HS, of selected polar solvents were determined on the PMMA/MWCNT nanocomposite. The values of ∆HS were correlated with both the acceptor and donor numbers of the solvents to determine the Lewis acidic constant KA and the Lewis basic constant KD of the PMMA/MWCNT nanocomposite. The PMMA/MWCNT nanocomposite selectivity was investigated using the acetate and alcohol isomers by IGC at temperatures between 393.2 and 403.2 K. Glass transition temperature (Tg) was determined using differential scanning calorimetry (DSC) and IGC method. The interactions between the PMMA/MWCNT nanocomposite and 12 solvents were propped at a temperature range (423.2–448.2 K). The Flory–Huggins interaction parameter, χ12∞, and the weight fraction activity coefficient, 0.25emΩ1∞, of the PMMA/MWCNT nanocomposite solvent system were estimated at temperatures between 423.2 and 448.2 K. The solubility parameter of the PMMA/MWCNT nanocomposite, δ2, was calculated as 14.0 (cal/cm3)1/2.

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A study of the thermodynamical interactions with solvents and surface characterisation of liquid crystalline 5-(( S )-3,7-dimethyloctyloxy)-2-[[[4-(dodecyloxy)phenyl]imino]-methyl]phenol by inverse gas chromatography

Cited by 28 publications

References 21 publications

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

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

An Attempt to Chromatographic Determination of Acceptor-Donor Properties of Liquid Crystals

Synthesis and thermodynamic characterization of poly(methyl methacrylate)/multiwall carbon nanotube nanocomposite

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