Interrelations between Adsorption Energies and Local Isotherms, Local Monolayer Capacities, and Energy Distribution Functions, as Determined for Heterogeneous Surfaces by Inverse Gas Chromatography

2001 ◽  
Vol 239 (1) ◽  
pp. 10-19 ◽  
Author(s):  
Nicholas A. Katsanos ◽  
Efstathia Iliopoulou ◽  
Vassilis Plagianakos ◽  
Helen Mangou
Keyword(s):  
Gas Chromatography ◽  
Energy Distribution ◽  
Inverse Gas Chromatography ◽  
Distribution Functions ◽  
Heterogeneous Surfaces ◽  
Adsorption Energies ◽  
Energy Distribution Functions

Surface characterization of carbon fibers by inverse gas chromatography at low pressures

2002 ◽  
Vol 17 (2) ◽  
pp. 413-422 ◽  
Author(s):  
J. Rubio ◽  
F. Rubio ◽  
J. L. Fierro ◽  
M. C. Gutierrez ◽  
J. L. Oteo
Keyword(s):  
Gas Chromatography ◽  
Free Energy ◽  
Carbon Fiber ◽  
Energy Distribution ◽  
Surface Free Energy ◽  
Carbon Fibers ◽  
Inverse Gas Chromatography ◽  
Distribution Functions ◽  
Acid Base ◽  
Energy Distribution Functions

Carbon fiber surfaces were analyzed by inverse gas chromatography (IGC) and x-ray photoelectron spectroscopy (XPS). IGC measurements were carried out at infinite and finite dilution by using neutral and specific probes. At infinite dilution the dispersive component of the surface free energy and the acid–base indexes were obtained. At finite dilution the energy distribution functions were calculated. Three carbon fibers were analyzed, one untreated and two fibers treated with different sizings. The fibers have similar dispersive components of surface free energy but their acid–base characteristics are markedly different. The untreated fiber has an acidic surface, and the sized fibers have a surface with high base character. The energy distribution functions show different peaks assigned to active sites existing on the carbon fiber surfaces. The use of acid or basic probes provides different energy distribution functions with good correlation with the base and acid character of the fiber surface. Changes in surface heterogeneity revealed by energy distribution functions were correlated also with surface chemical composition derived from high-resolution XPS measurements.

Adsorption on Heterogeneous Surfaces: Site Energy Distribution Functions from Fritz-Schlüender Isotherms

ChemPhysChem ◽  
2010 ◽  
Vol 11 (12) ◽  
pp. 2555-2560 ◽  
Author(s):  
Kannuchamy Vasanth Kumar ◽  
Mateus Carvalho Monteiro de Castro ◽  
Manuel Martinez-Escandell ◽  
Miguel Molina-Sabio ◽  
Francisco Rodriguez-Reinoso
Keyword(s):  
Energy Distribution ◽  
Distribution Functions ◽  
Heterogeneous Surfaces ◽  
Site Energy ◽  
Adsorption On Heterogeneous Surfaces ◽  
Energy Distribution Functions

Measurement of adsorption energies on heterogeneous surfaces by inverse gas chromatography

1999 ◽  
Vol 845 (1-2) ◽  
pp. 103-111 ◽  
Author(s):  
Nicholas A Katsanos ◽  
Nicholaus Rakintzis ◽  
Fani Roubani-Kalantzopoulou ◽  
Evagelia Arvanitopoulou ◽  
Athanasios Kalantzopoulos
Keyword(s):  
Gas Chromatography ◽  
Inverse Gas Chromatography ◽  
Heterogeneous Surfaces ◽  
Adsorption Energies
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