Aspects of acid-base interactions and use of inverse gas chromatography

Mukhopadhyay, Prithu; Schreiber, H. P.

doi:10.1016/0927-7757(95)03137-3

Cited by 179 publications

(131 citation statements)

References 143 publications

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“…It enables to obtain the dispersion component of the surface energy, adsorption thermodynamic parameters with a wide range of polar substances (specific components of the free energy of adsorption, enthalpy and entropy of adsorption), Lewis acidbase character of the surface, surface nanoroughness parameter, etc. [11][12][13][14]. Thus, using IGC a cellulosic fibrous material can be thoroughly characterized with respect to its surface chemical properties.…”

Section: Page 3 Of 26mentioning

confidence: 99%

“…Two columns were prepared for each material with the final results being the average of two separate measurement series. The theoretical aspects of inverse gas chromatography have been previously described [11][12][13]. Using this technique, the dispersion component of the surface energy, and the specific components of the work of adhesion, enthalpy and entropy of adsorption of polar probes on the surface of the analysed materials were obtained.…”

Section: Page 6 Of 26mentioning

confidence: 99%

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Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography

Gamelas

Pedrosa

Lourenço

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography, Colloids and Surfaces A: Physicochemical and Engineering Aspects (2015), http://dx.doi.org/10.1016/j.colsurfa. 2014.12.058 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Higher specific interactions with polar probes were found for enzymatic nanocellulose. The higher values of s d and specific interactions observed for the enzymatic nanocellulose could partly be due to the higher crystallinity of this sample. On the other hand, the increase of the acidity/basicity ratio (as well as of the s d value) for the 15-passes vs. 5-passes TEMPO nanofibres was attributed to a higher exposition of the hydroxyl groups of cellulose at the surface of the former material.

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Section: Page 3 Of 26mentioning

confidence: 99%

Section: Page 6 Of 26mentioning

confidence: 99%

Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography

Gamelas

Pedrosa

Lourenço

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…In this equation, R is the gas constant and T is the column absolute temperature. The constant K is dependent on the chosen reference state [24].…”

Section: Inverse Gas Chromatographymentioning

confidence: 99%

“…The theoretical aspects of inverse gas chromatography can be found elsewhere [22,24,25]. Briefly, the retention of a gas or vapour probe molecule in the IGC column is quantified by the net retention volume, V n , which can be calculated from IGC data using Eq.…”

Section: Inverse Gas Chromatographymentioning

confidence: 99%

“…Inverse gas chromatography (IGC) is an appropriate tool to assess the surface properties of powdered solid materials, such as xylans, not possible to assess adequately, for instance, by classical contact-angle measurements (due to associated problems like porosity, roughness, surface heterogeneity). IGC enables to obtain the dispersive component of the surface energy, specific interactions (non-dispersive) with polar probes, Lewis acid-base character of the surface, surface nanoroughness parameter, Flory-Huggins interaction parameter [22][23][24][25], among other properties. This technique has been widely used for the study of cellulose and lignocellulosic materials U N C O R R E C T E D P R O O F [22] but, to our knowledge, it has never been reported before for the study of xylans of any type.…”

Section: Introductionmentioning

confidence: 99%

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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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Surface energy mapping of Kevlar� fibers by inverse gas chromatography

Rebouillat

Donnet

Guo

et al. 1998

J. Appl. Polym. Sci.

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ABSTRACT:The surface energy characteristics of three Kevlar ᭨ fibers have been systematically studied using two inverse gas chromatography (IGC) techniques, i.e., at an infinite probe dilution and at a finite probe concentration, with the latter allowing a unique mapping of the surface energy levels, which complements greatly the more traditional characterization of the highest energy sites.The standard thermodynamic parameters, such as the free energy 0 DGЊ A , and the adsorption enthalpy and entropy ( DHЊ A and 0 DSЊ A ), as well as the dispersive and the specific component ( g Using the second IGC approach, i.e., at finite concentration, the isotherms for the adsorption of n-octane and n-hexylamine on the three selected Kevlar ᭨ fibers were constructed by the one-peak method. These are shown to be instrumental to establish the corresponding energy distribution functions. The results may indicate that, unlike the alkane probes, the polar molecules interact strongly with the Kevlar ᭨ fiber surfaces, which appear, in this case, energetically heterogeneous. The resulting energy distribution mapping opens new avenues towards the surface characterization of the global surface without the restriction of the averaging imposed by other bulk analysis techniques.

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Aspects of acid-base interactions and use of inverse gas chromatography

Cited by 179 publications

References 143 publications

Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography

Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography

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

Surface energy mapping of Kevlar� fibers by inverse gas chromatography

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