Characterization of an Algerian diatomite by inverse gas chromatography: Specific and non-specific contribution and Lewis acid–base parameters

Daoui, Hanifa; Boutoumi, Hocine; Bouhamidi, Y.; Boucherit, Ahmed; Zouikri, Mohamed

doi:10.1080/1023666x.2018.1478247

Cited by 6 publications

(2 citation statements)

References 32 publications

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“…The results obtained are in agreement with those of the literature for a crystalline silica. 16,17 Microporous materials have high energy sites inside pores. 18,19 Such sites can irreversibly adsorb molecular species if they have not been fully activated beforehand.…”

Section: Characterization Of the Different Chromatographic Supportsmentioning

confidence: 99%

Preparation of Chromatographic Media from Algerian Diatomite

Daoui-Bahar

Boutoumi

Bouhamidi

2022

Kemija U Industriji

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X-ray photoelectron spectrometry combined with FTIR spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy (SEM) allowed highlighting the different interactions of grafts or impregnated polymers on the mineral surface of diatomite obtained by treatment of raw diatomite under reflux with a 5 M solution of hydrochloric acid for 24 h. This acid treatment led to almost total elimination of organic impurities with a total decalcification of the diatomite, leading to its deferrization and partial dealumination, and the obtaining of a support with a homogeneous siliceous surface mainly constituted of Si−OH and Si−O−Si functional groups. The surface of the diatomite washed with HCl became totally saturated with PEG-20M and SE30 with respective impregnation rates of 5 and 2 %. However, the grafting and/or impregnation of this diatomite with octadecyltrichlorosilane (C18) and docosane (C22) led to the formation of perfectly homogeneous surfaces.

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Section: Characterization Of the Different Chromatographic Supportsmentioning

confidence: 99%

Preparation of Chromatographic Media from Algerian Diatomite

Daoui-Bahar

Boutoumi

Bouhamidi

2022

Kemija U Industriji

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“…This attractive technique was used since 1970 to quantify the specific interactions and the surface properties and glass transition of polymers, copolymers, their blends, polymer films [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. It was also used to determine the surface energy, the physicochemical properties and the Lewis's acid base of metals and metal oxides, minerals, clay minerals [19][20][21][22][23][24][25][26][27][28][29][30][31], silicas and porous materials [32][33][34][35][36][37][38][39], nanomaterials [40][41][42][43][44][45][46], pharmaceuticals and food products [47][48][49][50][51]…”

Section: Introductionmentioning

confidence: 99%

New Physicochemical Methodology for the Determination of the Surface Thermodynamic Properties of Solid Particles

Hamieh¹

2023

Preprint

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The study of the surface thermodynamic properties of solid materials is primordial for the determination of the dispersive surface energy, polar enthalpy of adsorption and Lewis’s acid base properties of solid particles. Inverse gas chromatography technique (IGC) at infinite dilution is the best surface technique for the determination of the surface physicochemical properties of materials. (1) Background: This paper was devoted to study the surface properties of solid materials such as alumina particles by using IGC technique. (2) Methods: Different methods and molecular models such as spherical, cylindrical, van der Waals, Redlich-Kwong, Kiselev and geometric models, were used to determine the London dispersive surface energy of solid surfaces. Hamieh model was also used and highlighted the thermal effect on the surface area of solvents. (3) Results: The variations of the dispersive surface energy and the free energy of adsorption were determined for alumina particles as a function of the temperature as well as their Lewis’s acid base constants. Alumina surfaces were proved to exhibit a strong Lewis amphoteric character three time more basic than acidic (4) Conclusions: The new methodology based on Hamieh model gave the more accurate results of the physicochemical properties of the particle surfaces.

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