Immersion Calorimetry: Molecular Packing Effects in Micropores

S. Hadi Madani, Ana Silvestre-Albero, Mark J. Biggs, Francisco Rodríguez-Reinoso, Phillip Pendleton

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3984-3991
Number of pages8
JournalChemPhysChem
Volume16
Issue number18
DOIs
Publication statusPublished - 21 Dec 2015

Keywords

  • adsorption
  • immersion calorimetry
  • molecular packing
  • nitrogen
  • pore size distribution

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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  • Cite this

    Madani, S. H., Silvestre-Albero, A., Biggs, M. J., Rodríguez-Reinoso, F., & Pendleton, P. (2015). Immersion Calorimetry: Molecular Packing Effects in Micropores. ChemPhysChem, 16(18), 3984-3991. https://doi.org/10.1002/cphc.201500580