scholarly journals Bentonite from Porto Santo Island, Madeira archipelago: surface properties studied by inverse gas chromatography

Clay Minerals ◽  
2010 ◽  
Vol 45 (1) ◽  
pp. 77-86 ◽  
Author(s):  
N. Cordeiro ◽  
J. Silva ◽  
C. Gomes ◽  
F. Rocha
Keyword(s):  
Gas Chromatography ◽  
Surface Properties ◽  
Inverse Gas Chromatography ◽  
Particle Surface ◽  
Sorption Isotherms ◽  
Surface Heterogeneity ◽  
Surface Areas ◽  
Dispersive Surface Energy ◽  
Madeira Archipelago

AbstractThe present paper shows the importance of Inverse Gas Chromatography (IGC) for the determination of the surface properties of bentonites. These properties are dispersive surface energy, acid-base properties, surface heterogeneity, sorption isotherms, BET surface areas and heat of sorption, using different probe molecules. IGC can contribute to the interpretation, prediction and optimization of the studied materials' properties. The paper focuses on two distinctive bentonite samples from Porto Santo Island, Madeira archipelago. In view of their potential value, achieved through their incorporation in products for dermopharmacy and dermocosmetics, particle size and particle surface properties are of fundamental importance.

Determination of surface heterogeneity of d-mannitol by sessile drop contact angle and finite concentration inverse gas chromatography

2010 ◽  
Vol 387 (1-2) ◽  
pp. 79-86 ◽  
Author(s):  
Raimundo Ho ◽  
Steven J. Hinder ◽  
John F. Watts ◽  
Sarah E. Dilworth ◽  
Daryl R. Williams ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Contact Angle ◽  
Inverse Gas Chromatography ◽  
Sessile Drop ◽  
Surface Heterogeneity ◽  
Finite Concentration

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

2021 ◽  
Author(s):  
Tayssir Hamieh
Keyword(s):  
Gas Chromatography ◽  
Sodium Alginate ◽  
Surface Area ◽  
Surface Properties ◽  
Inverse Gas Chromatography ◽  
Chemical Engineering ◽  
Specific Enthalpy ◽  
Free Energy Of Adsorption ◽  
Dispersive Component

Abstract 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.

scholarly journals Inverse gas chromatography as a method for determination of surface properties of binding materials

2017 ◽  
Vol 242 ◽  
pp. 012001
Author(s):  
Jihai Yu ◽  
Xiaolei Lu ◽  
Chunxia Yang ◽  
Baoli Du ◽  
Shuxian Wang ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Surface Properties ◽  
Inverse Gas Chromatography
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