Thermodynamic Characterization of Sodium Alginate by Inverse Gas Chromatography

Uğraşkan, Volkan; Işık, Birol; Yazıcı, Özlem; Çakar, Fatih

doi:10.1021/acs.jced.9b01074

Cited by 17 publications

(18 citation statements)

References 40 publications

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“…In the calculation of " # , Ugraskan et al [1] not only supposed the surface areas constant but there is probably a certain error committed by considering constant the value of the dispersive component $ # of the surface energy of organic molecules when the temperature changes. In fact, $ # also depends on the temperature.…”

Section: New Results On the Determination Of The Dispersive Component Of The Surface Energy Of Sodium Alginatementioning

confidence: 99%

“…In this paper, we propose to correct the surface properties determined by Ugraskan et al [1]. In fact, these authors had used the Schultz et al [20] and Dorris-Gray [21] methods, both, based on Fowkes relation [22].…”

Section: Itroductionmentioning

confidence: 99%

“…

In their paper published in the Journal of Chemical Engineering Data, Ugraskan et al [1] made several inaccuracies in the determination of the surface properties of sodium alginate by using the inverse gas chromatography (IGC) technique. The proposed method to determine the dispersive component of the surface energy, " # , cannot be correctly evaluated, because it depends on the surface area of n-alkanes or of methylene group.

…”

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confidence: 99%

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Correction of some thermodynamic surface properties of Sodium Alginate determined by Inverse Gas Chromatography

Hamieh¹

2021

Preprint

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In their paper published in the Journal of Chemical Engineering Data, Ugraskan et al. [1] made several inaccuracies in the determination of the surface properties of sodium alginate by using the inverse gas chromatography (IGC) technique. The proposed method to determine the dispersive component of the surface energy, I, cannot be correctly evaluated, because it depends on the surface area of n-alkanes or of methylene group. This surface area supposed by Ugraskan et al. [1] constant strongly depends on the temperature. Therefore, the specific free energy of adsorption, (-ΔGsp), and consequently the specific enthalpy of adsorption, (-ΔHsp), cannot be known with accuracy. The wrong values of (-ΔHsp), certainly lead to inaccurate determination of the acid KA and base KD constants of the solid.

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Section: New Results On the Determination Of The Dispersive Component Of The Surface Energy Of Sodium Alginatementioning

confidence: 99%

Section: Itroductionmentioning

confidence: 99%

“…

…”

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confidence: 99%

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Correction of some thermodynamic surface properties of Sodium Alginate determined by Inverse Gas Chromatography

Hamieh¹

2021

Preprint

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“…The specific retention volume

V_{g}^{0}

is used instead of V N to eliminate the effect of quantity of the stationary phase and the effect of temperature, as described in the following equation 7,29 :

V_{g}^{0} = Q J_{3}^{2} ((), t_{R} - t_{A}) 273.2 / ((), T_{f} w),

where w is the weight of the PMMA/MWCNT nanocomposite in the column.…”

Section: Inverse Gas Chromatography Theorymentioning

confidence: 99%

“…In IGC, the column is filled with the solid material under probe, and vapor is injected into the column. IGC could be used to determine different properties of the immobile phase, such as acid–base characteristics, the glass transition temperature ( T g ), solubility parameters, polymer–polymer interaction parameters, surface area, crystallinity, and surface tension 7–11,19,20 …”

Section: Introductionmentioning

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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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 Characterization of Sodium Alginate by Inverse Gas Chromatography

Cited by 17 publications

References 40 publications

Correction of some thermodynamic surface properties of Sodium Alginate determined by Inverse Gas Chromatography

Correction of some thermodynamic surface properties of Sodium Alginate determined by Inverse Gas Chromatography

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

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

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