Rediscovering the problem of interpretation of chromatographically determined enthalpy and entropy of adsorption of different adsorbates on carbon materials

Grajek, H.

doi:10.1016/j.chroma.2006.12.019

Cited by 37 publications

(21 citation statements)

References 171 publications

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“…More recently, Grajek [33] determined the enthalpy and entropy of adsorption of different adsorbates by IGC. However, the effect of the tacticity of polymer on the specific entropy has never been studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

2011

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Inverse gas chromatography (IGC) at infinite dilution is a powerful technique to characterize the superficial and interfacial properties of solid substrates as oxides, polymers or polymers adsorbed on oxides. It can also be used to determine the physicochemical properties and the transition phenomena of polymers. In this paper, IGC was used to determine the changes, as a function of temperature, of the specific free enthalpy DG a SP and deduce the specific entropy DS a SP of poly (methyl methacrylate) (PMMA) adsorbed on alumina or on silica for different tacticities of PMMA. The study of the surface properties of PMMA/SiO 2 and PMMA/Al 2 O 3 , revealed an important difference in the physicochemical behaviour of oxides covered by various concentrations of PMMA. This study also highlighted an important effect of the tacticity of the polymer on the specific entropy of PMMA adsorbed on oxides.

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Section: Introductionmentioning

confidence: 99%

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

2011

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“…The retention data obtained enable calculation of values describing surface properties. This technique has been described in several reviews [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Inverse Gas Chromatographic Characterization of Aluminosilicates as Fillers for Abrasive Articles

2012

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The surface properties of aluminosilicates (perlites and zeolites)-potential fillers in abrasive articles-have been examined by inverse gas chromatography. The dispersive component of the surface free energy (c D S ) and K A and K D describing the acidity and basicity, respectively, of the fillers were used to express the surface activity of examined materials. The Flory-Huggins parameter, v 0 23 ; characterized the interactions between polymer and filler, i.e., interactions between phenolic resin and filler. Zeolites were found to be materials with an active surface layer and relatively high ability to participate in filler-resin interactions. Therefore, they might be considered as potential ''replacement material'' for standard fillers. The IGC-derived values mentioned above provided useful information about the behavior of fillers during the manufacture and use of abrasive articles.

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“…The retention times were estimated on the basis of the first statistic moment, m 1 , i.e. the centres of gravity of peaks: The retention times corresponding to the infinitely low coverage of the MCM surface with probe molecules were determined by employing the following dependency [14]:…”

Section: Chromatographic Testsmentioning

confidence: 99%

“…The specific retention volumes were calculated by employing the retention times determined for the infinite dilution of probe and referred to 1 gram of the MCM in the column [14]:…”

Section: Chromatographic Testsmentioning

confidence: 99%

Chromatographic characterisation of acceptor-donor properties of MCMs

Grajek

Paciura-Zadrożna

Witkiewicz³

2009

Annales UMCS, Chemistry

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The values of the specific retention volumes of non-polar and polar adsorbates chromatographed on the ordered mesoporous silica adsorbents (MCMs) were determined under their infinite dilution conditions. Two methods were employed for the calculation of the standard free energy of adsorption, ∆G ads , of the chromatographed adsorbates on the basis of the specific retention volumes. The ∆G ads values were employed for the estimation of the van der Waals contribution and specific contribution of the free surface energy for the MCMs and the parameters characterising their ability to act as acceptors, K A , and donors, K D , of electrons.

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Rediscovering the problem of interpretation of chromatographically determined enthalpy and entropy of adsorption of different adsorbates on carbon materials

Cited by 37 publications

References 171 publications

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

Inverse Gas Chromatographic Characterization of Aluminosilicates as Fillers for Abrasive Articles

Chromatographic characterisation of acceptor-donor properties of MCMs

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