This work compares the extent of reversibility and the thermodynamics of adsorption (Kads, ΔG°ads) of room-temperature vapors of common environmentally relevant monoterpenes (α-pinene, β-pinene, limonene, and 3-carene) and industrially relevant cyclic and acyclic non-terpene hydrocarbons (cyclohexane, hexane, octane, and cyclooctane) to fused silica surfaces. Vibrational sum frequency generation spectroscopy carried out in the C–H stretching region shows negligible surface coverage-dependent changes in the molecular orientation of all species surveyed except for cyclohexane. The group of monoterpenes studied here distinctly exhibits partially reversible adsorption to fused silica surfaces compared to the group of non-terpene hydrocarbons, demonstrating a link between molecular structure and adsorption thermodynamics. The standard Gibbs free energy of adsorption is nonlinearly correlated with the equilibrium vapor pressure of the compounds surveyed.
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Partially (resp. fully) reversible adsorption of monoterpenes (resp. alkanes and cycloalkanes) to fused silica
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21 February 2019
Research Article|
February 15 2019
Partially (resp. fully) reversible adsorption of monoterpenes (resp. alkanes and cycloalkanes) to fused silica
Special Collection:
Nonlinear Spectroscopy and Interfacial Structure and Dynamics
Yangdongling Liu
;
Yangdongling Liu
Department of Chemistry, Northwestern University
, Evanston, Illinois 60208, USA
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Hilary M. Chase;
Hilary M. Chase
Department of Chemistry, Northwestern University
, Evanston, Illinois 60208, USA
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Franz M. Geiger
Franz M. Geiger
a)
Department of Chemistry, Northwestern University
, Evanston, Illinois 60208, USA
a)Author to whom correspondence should be addressed: geigerf@chem.northwestern.edu
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a)Author to whom correspondence should be addressed: geigerf@chem.northwestern.edu
Note: This article is part of the Special Topic “Nonlinear Spectroscopy and Interfacial Structure and Dynamics” in J. Chem. Phys.
J. Chem. Phys. 150, 074701 (2019)
Article history
Received:
November 29 2018
Accepted:
January 24 2019
Citation
Yangdongling Liu, Hilary M. Chase, Franz M. Geiger; Partially (resp. fully) reversible adsorption of monoterpenes (resp. alkanes and cycloalkanes) to fused silica. J. Chem. Phys. 21 February 2019; 150 (7): 074701. https://doi.org/10.1063/1.5083585
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