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Sorption and thermodynamic properties of Terminalia superba Engl. & Diels and Triplochiton scleroxylon K. Schum. through the 15, 35 and 50 °C sorption isotherms

Sorption und thermodynamische Eigenschaften von Terminalia superba Engl. & Diels und Triplochiton scleroxylon K. Schum. mittels Sorptionsisothermen bei 15, 35 und 50 °C

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Abstract

The hygroscopicity and thermodynamic properties of Terminalia superba Engl. & Diels (limba) and Triplochiton scleroxylon K. Schum. (obeche) wood were studied and the species were compared. The 15, 35 and 50 °C isotherms were plotted by applying the saturated salts method and fitted using the GAB model. The thermodynamic parameters were obtained from the isotherms through the integration method of the Clausius–Clapeyron equation. Infrared spectra were used to study possible chemical modifications in the cell wall, and X-ray diffractograms were used to analyse the crystal structure of the cell wall. Obeche had shorter crystallite length and a lower crystallinity index, giving rise to a higher number of amorphous zones and thus a higher number of sorption sites in the monolayer. As a result, the saturation moisture content in the monolayer (X m ) is greater in obeche than in limba. In terms of the thermodynamic properties, in both species the net isosteric heat of sorption decreases as the equilibrium moisture content increases, and more energy is required in desorption than in adsorption.

Zusammenfassung

Die Hygroskopizität und die thermodynamischen Eigenschaften des Holzes von Terminalia superba Engl. & Diels (Limba) und Triplochiton scleroxylon K. Schum. (Obeche) wurden untersucht und die beiden Arten miteinander verglichen. Dazu wurden die Sorptionsisotherme für 15, 35 und 50 °C mittels gesättigter Salzlösungen bestimmt und entsprechend dem GAB-Modell angepasst. Die thermodynamischen Parameter wurden anhand der integrierten Methode der Clausius-Clapeyron-Gleichung aus den Isothermen ermittelt. Mittels Infrarot-Spektren wurden mögliche chemische Veränderungen bestimmt und anhand von Röntgendiffraktogrammen wurde die kristalline Struktur der Zellwand untersucht. Obeche-Holz zeigte eine kürzere Kristallitlänge sowie einen geringeren Kristallinitätsindex. Dies führt zu einer größeren Anzahl von amorphen Bereichen und daher einer größeren Anzahl von funktionellen –OH Gruppen, die für das Sorptionswasser in der Monoschicht zugänglich waren. Folglich ist der Feuchtegehalt der Sättigung in der Monoschicht (Xm) von Obeche größer als von Limba. In Bezug auf die thermodynamischen Eigenschaften gilt für beide Arten, dass die isosterische Netto-Wärme bei steigender Gleichgewichtsfeuchte (ECM) sinkt und bei der Desorption mehr Energie benötigt als bei der Adsorption.

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Acknowledgments

This study is part of the AGL2009-12801 project of the 2008–2011 Spanish National Plan for Scientific Research, Development and Technological Innovation, funded by the Spanish Ministry of Science and Innovation.

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Authors and Affiliations

  1. Departamento de Ingeniería Forestal, Escuela Técnica Superior de Ingenieros de Montes, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040, Madrid, Spain

    Francisco G. Fernández, Luis G. Esteban, Paloma de Palacios, Cristina Simón & Alberto García-Iruela

  2. Departamento de Ingeniería Agrícola y Forestal, Escuela Universitaria de Ingenierías Agrarias, Universidad de Valladolid, Campus Universitario Duques de Soria, 42004, Soria, Spain

    Javier de la Fuente

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  1. Francisco G. Fernández
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  2. Luis G. Esteban
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  3. Paloma de Palacios
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  4. Cristina Simón
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  5. Alberto García-Iruela
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  6. Javier de la Fuente
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Correspondence to Francisco G. Fernández.

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Fernández, F.G., Esteban, L.G., de Palacios, P. et al. Sorption and thermodynamic properties of Terminalia superba Engl. & Diels and Triplochiton scleroxylon K. Schum. through the 15, 35 and 50 °C sorption isotherms. Eur. J. Wood Prod. 72, 99–106 (2014). https://doi.org/10.1007/s00107-013-0752-x

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