scholarly journals Dispersive Surface Energy and Acid-Base Parameters of Tosylate Functionalized Poly(ethylene glycol) via Inverse Gas Chromatography

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Feyza Sesigur ◽  
Dolunay Sakar ◽  
Ozlem Yazici ◽  
Fatih Cakar ◽  
Ozlem Cankurtaran ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Free Energy ◽  
Ethylene Glycol ◽  
Inverse Gas Chromatography ◽  
Basic Medium ◽  
Poly Ethylene Glycol ◽  
Dispersive Component ◽  
Dispersive Surface Energy ◽  
Base Parameters ◽  
Poly Ethylene

An inverse gas chromatographic (IGC) study of the sorption properties of poly(ethylene glycol) modified with tosylate (PEG-TOS) was presented. PEG-TOS was synthesized via the tosylation of the corresponding poly(ethylene glycol) (PEG) withp-toluenesulfonyl chloride in the basic medium. The synthesized PEG-Tos was characterized by FTIR-ATR and1HNMR techniques. The retention diagrams of n-hexane, n-heptane, n-octane, n-nonane, n-decane, dichloromethane, chloroform, acetone, tetrahydrofuran, ethyl acetate, and ethanol on the PEG and PEG-Tos were plotted at temperatures in K between 303 and 373 by inverse gas chromatography technique. The dispersive component of the surface-free energy,γSD, of studied adsorbent surface was estimated using retention times of different nonpolar organics in the infinite dilution region. Thermodynamic parameters of adsorption (free energy,ΔGAS, enthalpy,ΔHAS, and entropy,ΔSAS), dispersive components of the surface energies,γSD, and the acid,KA, and base,KD, constants for the PEG and PEG-Tos were calculated and the results were discussed.

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.

Selectivity equivalence of poly(ethylene glycol) stationary phases for gas chromatography

2000 ◽  
Vol 898 (2) ◽  
pp. 211-226 ◽  
Author(s):  
Colin F. Poole ◽  
Qinglin Li ◽  
Waruna Kiridena ◽  
Wladyslaw W. Koziol
Keyword(s):  
Gas Chromatography ◽  
Ethylene Glycol ◽  
Stationary Phases ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
Sign in / Sign up

Export Citation Format

Share Document