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Immersion calorimetry: molecular packing effects in micropores

journal contribution
posted on 2016-01-14, 13:25 authored by S. Hadi Madani, Ana Silvestre-Albero, Mark Biggs, Francisco Rodriguez-Reinoso, Phillip Pendleton
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.

Funding

This paper was funded by the Australian Research Council discovery program (DP110101293).

History

School

  • Science

Department

  • Chemistry

Published in

ChemPhysChem

Pages

n/a - n/a

Citation

MADANI, S.H. ...et al., 2015. Immersion calorimetry: molecular packing effects in micropores. ChemPhysChem, 16(18), pp. 3984–3991.

Publisher

© Wiley-VCH Verlag

Version

  • VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This paper is in closed access.

ISSN

1439-4235

Language

  • en

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