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Hydrating softwood and hardwood samples using pure and modified supercritical carbon dioxide

Hydrating softwood and hardwood samples using pure and modified supercritical carbon dioxide

Hammond, Georgina ORCID: 0000-0002-3307-1011 and Cox, Phil ORCID: 0000-0003-4683-0627 (2017) Hydrating softwood and hardwood samples using pure and modified supercritical carbon dioxide. Heritage Science, 5:16. pp. 1-12. ISSN 2050-7445 (Online) (doi:

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This article describes an in-progress research project that looks to investigate the use of supercritical carbon dioxide (scCO2) for the addition of water to historic and modern, softwood and hardwood samples. The experiments were carried out at 20 MPa and 50 °C, the effects of co-solvent addition, methanol (MeOH), were examined. A three point bend test provided mechanical data for the wood samples treated with both pure and modified scCO2. All the wood samples, with only one exception, saw an increase in Modulus of Rupture (MOR) after being treated with scCO2. Thereby indicating an increased resistance to force in the treated samples. Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy was performed to help deduce if any trends in the OH/CH and OH/Cellulose peak area ratios could be established with the nature of the treatment and the type of wood used. The development of this technique seeks to be relevant and safe for applications within modern conservation practices, where dry and fragile materials are prevalent.

Item Type: Article
Additional Information: © The Author(s) 2017. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Uncontrolled Keywords: Supercritical fluids; Supercritical carbon dioxide; Co-solvent; Hardwood; Softwood; Mechanical testing; Three-point bend test; DRIFT spectroscopy; Conservation
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > School of Engineering (ENN)
Last Modified: 11 Jan 2021 11:59
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None

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