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https://hdl.handle.net/2440/100688
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Type: | Journal article |
Title: | Immersion calorimetry: molecular packing effects in micropores |
Author: | Madani, S.H. Silvestre-Albero, A. Biggs, M.J. Rodríguez-Reinoso, F. Pendleton, P. |
Citation: | ChemPhysChem: a European journal of chemical physics and physical chemistry, 2015; 16(18):3984-3991 |
Publisher: | Wiley Online Library |
Issue Date: | 2015 |
ISSN: | 1439-4235 1439-7641 |
Statement of Responsibility: | S. Hadi Madani, Ana Silvestre-Albero, Mark J. Biggs, Francisco Rodríguez‐Reinoso and Phillip Pendleton |
Abstract: | Repeated and controlled immersion calorimetry experiments were performed to determine the specific surface area and pore-size distribution (PSD) of a well-characterized, microporous poly(furfuryl alcohol)-based activated carbon. The PSD derived from nitrogen gas adsorption indicated a narrow distribution centered at 0.57±0.05 nm. Immersion into liquids of increasing molecular sizes ranging from 0.33 nm (dichloromethane) to 0.70 nm (α-pinene) showed a decreasing enthalpy of immersion at a critical probe size (0.43-0.48 nm), followed by an increase at 0.48-0.56 nm, and a second decrease at 0.56-0.60 nm. This maximum has not been reported previously. After consideration of possible reasons for this new observation, it is concluded that the effect arises from molecular packing inside the micropores, interpreted in terms of 2D packing. The immersion enthalpy PSD was consistent with that from quenched solid density functional theory (QSDFT) analysis of the nitrogen adsorption isotherm. |
Keywords: | Adsorption immersion calorimetry molecular packing nitrogen pore size distribution |
Rights: | © 2015 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim |
DOI: | 10.1002/cphc.201500580 |
Grant ID: | http://purl.org/au-research/grants/arc/DP110101293 |
Published version: | http://dx.doi.org/10.1002/cphc.201500580 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
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