Study of the temperature effect on the surface area of model organic molecules, the dispersive surface energy and the surface properties of solids by inverse gas chromatography

2020 ◽  
Vol 1627 ◽  
pp. 461372 ◽  
Author(s):  
Tayssir Hamieh
Keyword(s):  
Gas Chromatography ◽  
Surface Energy ◽  
Temperature Effect ◽  
Surface Area ◽  
Surface Properties ◽  
Inverse Gas Chromatography ◽  
Organic Molecules ◽  
Dispersive Surface Energy

scholarly journals Surface Energy Heterogeneity Profiles of Carbon Nanotubes with a Copolymer-Modified Surface Using Surface Energy Mapping by Inverse Gas Chromatography

2017 ◽  
Vol 45 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Fruzsina Gerencsér ◽  
Norbert Rieder ◽  
Csilla Varga ◽  
Jenő Hancsók ◽  
András Dallos
Keyword(s):  
Carbon Nanotubes ◽  
Gas Chromatography ◽  
Surface Energy ◽  
Surface Treatment ◽  
Inverse Gas Chromatography ◽  
Dispersive Surface Energy ◽  
Energetic Heterogeneity ◽  
Multi Walled Carbon Nanotubes ◽  
Type Coupling ◽  
Energy Mapping

Abstract The effectiveness and quantitative control of the surface transition of multi-walled carbon nanotubes (MWCNTs) was characterized by inverse gas chromatography (iGC). The surface energy profile of carbon nanotubes compatibilized with an olefin-maleic-anhydride-ester-amide (OMAEA)-type coupling agent was determined by a surface energy analyzer (SEA). The surface energetic heterogeneity with energy distributions of dispersive and specific (acid-base) components of the surface energy of the MWCNTs were determined at various surface coverages. The results of the surface energy mapping showed that surface treatment significantly reduced the dispersive surface energy of MWCNTs and increased the specific surface energy. Furthermore, the surface modification enhanced its Lewis basic character and simultaneously decreased the acidic character of MWCNTs. It has been demonstrated that the surface treatment modified the heterogeneity profiles of the energetic surface of the carbonaceous nanomaterials.

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 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.

scholarly journals A New Method To Determine Dispersive Surface Energy Site Distributions by Inverse Gas Chromatography

Langmuir ◽  
2014 ◽  
Vol 30 (27) ◽  
pp. 8029-8035 ◽  
Author(s):  
Robert R. Smith ◽  
Daryl R. Williams ◽  
Daniel J. Burnett ◽  
Jerry Y. Y. Heng
Keyword(s):  
Gas Chromatography ◽  
Surface Energy ◽  
Inverse Gas Chromatography ◽  
New Method ◽  
Dispersive Surface Energy

Characterization of Silica Xerogels Surfaces by Inverse Gas Chromatography (IGC)

2000 ◽  
Vol 73 (4) ◽  
pp. 634-646 ◽  
Author(s):  
J. B. Donnet ◽  
T. K. Wang ◽  
Y. J. Li ◽  
H. Balard ◽  
G. T. Burns
Keyword(s):  
Gas Chromatography ◽  
Surface Energy ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Inverse Gas Chromatography ◽  
Residual Water ◽  
Silica Xerogels ◽  
Finite Concentration

Abstract Silylated silica xerogels, with controlled specific surface area and porosity, were prepared by a two-step procedure. In the first step, hydrogels were treated “in-situ” with hexamethyldisiloxane (HMDS) in the presence of 2-propanol and acid. In the second step, the hydrophobic gel was transferred into an organic solvent, the residual water removed by azeotropic distillation and the dried xerogel isolated by evaporating the solvent. Using this procedure, structure collapse of the hydrogels was minimized and it was possible to make xerogels with controlled specific surface area and porosity by varying the aging conditions of the hydrogels. The surface properties of both the untreated and the “in-situ” treated silica xerogels were examined by inverse gas chromatography (IGC) at either infinite dilution conditions (IGC-ID) or finite concentration conditions (IGC-FD). The former method was used to monitor the thermodynamic parameters of adsorption of molecular probes in interaction with the sites having the highest energies, while the latter method was used to provide information about the surface energy heterogeneity of the whole surface. The results for the xerogels are also compared to those obtained on untreated and silylated fumed silicas. After silylation, a systematical surface energy decrease has been observed at both ID and FD conditions of IGC for the two types of silica. However, the modified xerogels with higher surface coverage than silylated fumed silica show some different behaviors.

Surface Energy of Commercial and Pyrolytic Carbon Blacks by Inverse Gas Chromatography

1997 ◽  
Vol 70 (5) ◽  
pp. 759-768 ◽  
Author(s):  
Hans Darmstadt ◽  
Christian Roy ◽  
Serge Kaliaguine ◽  
Helga Cormier
Keyword(s):  
Gas Chromatography ◽  
Surface Energy ◽  
Carbon Black ◽  
Surface Area ◽  
Inverse Gas Chromatography ◽  
Specific Interaction ◽  
Pyrolytic Carbon ◽  
Dispersive Component ◽  
Carbon Blacks ◽  
Carbonaceous Deposits

Abstract The surface properties of carbon blacks obtained by vacuum pyrolysis of different used rubbers (CBp) and of commercial carbon blacks were measured by inverse gas chromatography (IGC). The dispersive component of the surface energy (γsd) and the specific interaction (Isp) of the recovered CBp were lower than γsd and Isp of the virgin carbon black initially present in the rubber. However, γsd and Isp of recovered medium surface area carbon black and of virgin low-surface-area carbon black were comparable. During the pyrolysis, carbonaceous deposits are formed on the CBp surface. A correlation between γsd and Isp and the amount of the carbonaceous deposits, measured by ESCA, was found, suggesting that the formation of these deposits is responsible for the decrease of γsd and Isp.

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