Inverse gas chromatography for the determination of the dispersive surface free energy and acid–base interactions of a sheet molding compound. I. Matrix material and glass

2008 ◽  
Vol 109 (6) ◽  
pp. 3519-3524 ◽  
Author(s):  
Ryan H. Mills ◽  
William T. Y. Tze ◽  
Douglas J. Gardner ◽  
Adriaan van Heiningen
Keyword(s):  
Gas Chromatography ◽  
Free Energy ◽  
Inverse Gas Chromatography ◽  
Matrix Material ◽  
Compound I ◽  
Acid Base ◽  
Molding Compound ◽  
Sheet Molding Compound ◽  
Dispersive Surface Free Energy

scholarly journals Determination of the surface properties of kaolinite by inverse gas chromatography

2018 ◽  
Vol 2017 (2) ◽  
pp. 319-328 ◽  
Author(s):  
Ceyda Bilgiç
Keyword(s):  
Gas Chromatography ◽  
Free Energy ◽  
Inverse Gas Chromatography ◽  
Specific Enthalpy ◽  
Free Energy Of Adsorption ◽  
Dispersive Component ◽  
Enthalpy Of Adsorption ◽  
Kaolinite Surface ◽  
Acceptor Numbers

Abstract Inverse gas chromatography (IGC) was applied to characterize the surface of kaolinite. The adsorption thermodynamic parameters (the standard enthalpy (∆H0), entropy (∆S0) and free energy of adsorption (∆G0), the dispersive component of the surface energy (γsd), and the acid/base character of kaolinite surface were estimated by using the retention time of different non-polar and polar probes at infinite dilution region. The specific free energy of adsorption (∆Gsp), the specific enthalpy of adsorption (∆Hsp), and the specific entropy of adsorption (∆Ssp) of polar probes on kaolinite were determined. (∆Gsp) values were correlated with the donor and modified acceptor numbers of the probes to quantify the acidic (KA) and the basic (KD) parameters of the kaolinite surface. The values obtained for the parameters KA and KD indicated a basic character for kaolinite surface.

Inverse Gas Chromatography Study on London Dispersive Surface Free Energy and Electron Acceptor–Donor of Fluconazole Drug

2017 ◽  
Vol 62 (7) ◽  
pp. 2090-2094 ◽  
Author(s):  
Praveen Kumar Basivi ◽  
Visweswara Rao Pasupuleti ◽  
Ramanaiah Seella ◽  
Madhusudana Reddy Tukiakula ◽  
Subramanyam Reddy Kalluru ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Free Energy ◽  
Surface Free Energy ◽  
Electron Acceptor ◽  
Inverse Gas Chromatography ◽  
Dispersive Surface Free Energy

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.

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