Inverse gas chromatography characterization of birch wood meal

Kamdem, D. Pascal; Bose, Samar K.; Luner, P.

doi:10.1021/la00035a049

Cited by 95 publications

(46 citation statements)

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“…If non-polar components (such as n-alkanes) are Table 2. Characteristics of IGC probes (Kamdem et al 1993;Santos et al 2001). used, only dispersive interactions occur and the adhesion work is given by…”

Section: Determination Of the Dispersive Component Of Surface Tensionmentioning

confidence: 99%

The Effects of Beating, Web Forming and Sizing on the Surface Energy of Eucalyptus globulus Kraft Fibres Evaluated by Inverse Gas Chromatography

Carvalho

Santos

Martins³

et al. 2005

Cellulose

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In this work attention has been focused on the effects of papermaking beating, web forming and sizing operations on the physical/chemical surface properties of bleached Eucalyptus globulus kraft fibres. Inverse gas chromatography (IGC) was used to determine the dispersive component of surface tension (c s d ) as well as the acidic/basic character (according to the Lewis concept) of the solid surfaces (pulp fibres and pulp handsheets). The results have shown that the main effect of beating is to increase the fibre's Lewis acidic character. Web forming caused a strong decrease in c s d and significant increments in the adhesion works of both acidic and basic probes, lowering the ratio between the two. Nevertheless, the surface of handsheets still exhibited a dominant acidic character. The sizing operation did not change the dispersive component of the surface tension significantly but decreased the difference between the adhesion works of the acidic and basic probes, rendering the handsheet surface less Lewis acidic and more Lewis basic. Thus, although internal sizing is expected to strongly influence liquid spreading at the paper surface and liquid penetration of the fibre's network, it is concluded that beating and web forming lead to important changes in the surface energetic properties of the Eucalyptus globulus kraft fibres.Abbreviations: A -molecular surface area of the probes used in the IGC study; Acet -acetone; AN* -Gutmann's modified acceptor number; CHCl 3 -trichloromethane; DCM -dichloromethane; DN -Gutmann's donor number; EtAcet -ethyl acetate; F -carrier gas flow rate (measured with a digital flow meter); GC -gas chromatography; IGC -inverse gas chromatography; J -correction factor for gas compressibility; K a -surface Lewis acidity; K b -surface Lewis basicity; N -Avogadro's constant; R -ideal gas law constant; T -temperature in Kelvin; t 0 -retention time of the non-interacting molecule; t r -retention time of the probe molecule; THF -tetrahydrofuran; V n -net retention volume; DG -free energy of adsorption of the probe on the stationary phase surface; DG

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Section: Determination Of the Dispersive Component Of Surface Tensionmentioning

confidence: 99%

The Effects of Beating, Web Forming and Sizing on the Surface Energy of Eucalyptus globulus Kraft Fibres Evaluated by Inverse Gas Chromatography

Carvalho

Santos

Martins³

et al. 2005

Cellulose

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“…If only dispersive interactions occur between sample and probe, the net retention volume, V n , can be related to the dispersive components of the surface free energy of the interacting solid and probe, γ s d a Data taken from references [22,25,29]. a is the molecular surface area of the probe, For the polar probes, there is a corresponding specific component contribution, ΔG a s , in addition to the dispersive component, to the overall free energy of adsorption [24].…”

Section: Inverse Gas Chromatographymentioning

confidence: 99%

Surface properties of xylan and xylan derivatives measured by inverse gas chromatography

Sousa

Pedrosa

Ramos

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Xylan (the most common hemicellulose in wood and annual plants) and xylan derivatives have a very wide field of uses for which physico-chemical surface properties play an important role (e.g. in composites or barrier materials). In the present work, for the first time, inverse gas chromatography (at infinite dilution conditions) was used to assess the surface properties of xylan and xylan derivatives. Firstly, carboxymethyl xylan (CMX) and hydroxypropyl xylan (HPX) have been synthesized from commercial xylan (BX) and the presence of substituent groups confirmed by infrared spectroscopy and 1 H NMR. Then, the modified and original xylans were analysed for their dispersive component of the surface energy (γ s d ) and Lewis acid-base properties. It was found that carboxymethylation and hydroxypropylation decreased significantly the γ s d value of xylan: from 47.6 mJ m −2 in BX to 33.0 mJ m −2 and 23.5 mJ m −2 in CMX and HPX, respectively. As for the Lewis acid-base properties, HPX showed a perfectly amphoteric behaviour while the surfaces of unmodified xylan and CMX showed a prevalence of Lewis acidic character over the Lewis basic character, being, however, the surface of CMX less acidic than that of the original xylan. These results were interpreted in terms of the effect of the presence of the new substituent groups in the xylan backbone.

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“…From Eqs. (32)- (34), one obtains: [41,61,117] for the apolar probes most commonly used in IGC studies.…”

Section: Dispersive Component Of the Surface Free Energy Of Solid Surmentioning

confidence: 99%

“…Here, DN and AN are Gutmann's donor and acceptor numbers, respectively, corresponding to the polar probes [61,117,127]. Gutmann [127] defines DN as the molar enthalpy of mixing of a base with reference to the acceptor, SbCl5.…”

Section: Quantification Of the Lewis Acid-base Interaction Capabilitymentioning

confidence: 99%

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Analysis of interactions in multicomponent polymeric systems: The key-role of inverse gas chromatography

Santos

Guthrie

2005

Materials Science and Engineering: R: Reports

107

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The properties of a polymeric system are a consequence of the interactions that occur between the various components of these complex systems. These components may vary significantly in terms of chemical nature (e.g. organic/inorganic), physical properties (e.g. particle size, surface area, molecular weight), structural characteristics and proportion in the formulations composition. This review paper addresses the major approaches in use regarding the analysis of the interactions that occur between the polymeric system components and the use of such approaches in the interpretation of the chemical, physical and thermodynamic properties of these systems. Special attention is given to the technique of inverse gas chromatography.A case study is presented, where use was made of inverse gas chromatography to characterize thermodynamically the surface of the major components of pigmented PC/PBT blends. The concept of Lewis acidity/basicity was used in the interpretation of the intermolecular interactions nature and potential in these blends, as encountered in phase separation and phase preferences phenomena and as expressed in the morphology, the physical and the mechanical properties of these commercially important composites. #

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Inverse gas chromatography characterization of birch wood meal

Cited by 95 publications

References 0 publications

The Effects of Beating, Web Forming and Sizing on the Surface Energy of Eucalyptus globulus Kraft Fibres Evaluated by Inverse Gas Chromatography

The Effects of Beating, Web Forming and Sizing on the Surface Energy of Eucalyptus globulus Kraft Fibres Evaluated by Inverse Gas Chromatography

Surface properties of xylan and xylan derivatives measured by inverse gas chromatography

Analysis of interactions in multicomponent polymeric systems: The key-role of inverse gas chromatography

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