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D2O Water Interaction with Mixed Alkane Thiol Monolayers of Tuned Hydrophobic and Hydrophilic Character
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Section:Abstract
We have used temperature-programmed desorption (TPD) experiments to characterize the interaction between D2O water and a self-assembled monolayer (SAM) of mixed hydrophobic and hydrophilic thiols on Au(111). Two-component SAM surfaces with tuned hydrophobic and hydrophilic character have been formed by exposing gold samples to solutions of octanethiol and 6-mercaptohexanoic acid in varying millimolar concentrations. Water desorption spectra from the pure hydrophobic surface exhibit first-order desorption at low coverage with the onset of zero-order character at 
1 Langmuir with narrow peaks at 145 K. In contrast, desorption of D2O water from the pure carboxylic acid-terminated surface exhibits broad peaks shifted to higher temperatures. Interestingly, water TPD spectra from a 50% octanethiol/50% 6-mercaptohexanoic acid surface closely resemble desorption from the purely hydrophobic octanethiol SAM. Increasing the surface acid fraction beyond 50% shifts the TPD profiles to higher temperatures with long, high-temperature tails that approach the behavior of water desorbing from the hydrophilic 6-mercaptohexanoic acid surface. We discuss the implications for water interaction with “textured” organic surfaces as well as with atmospherically relevant organic aerosol particles. In particular, the results suggest that significant surface oxidation is necessary to impact the interaction of water with organic aerosol surfaces.
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This article has been cited by 7 ACS Journal articles (5 most recent appear below).
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Benoît P. Pichon, Arnaud Demortière, Matthias Pauly, Karin Mougin, Alain Derory and Sylvie Bégin-ColinThe Journal of Physical Chemistry C2010 114 (19), 9041-9048Well-addressed surfaces which consist of self-assembled monolayers (SAMs) of organic molecules have been used to control the assembling of magnetic iron oxide nanoparticles (NPs) coated with oleic acid molecules. The assembling occurs through interactions ...
D2O Water Interaction with Textured Carboxylic Acid-Terminated Monolayer Surfaces Characterized by Temperature-Programmed Desorption and Molecular Dynamics
Ronald L. Grimm, Douglas J. Tobias and John C. HemmingerThe Journal of Physical Chemistry C2010 114 (3), 1570-1579D2O Water Interaction with Textured Carboxylic Acid-Terminated Monolayer Surfaces Characterized by Temperature-Programmed Desorption and Molecular Dynamics
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Microscopic Wetting of Mixed Self-assembled Monolayers: A Molecular Dynamics Study
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Milán Szöri, Douglas J. Tobias and Martina RoeselováThe Journal of Physical Chemistry B2009 113 (13), 4161-4169Molecular dynamics simulations are used to study the evolution of the organization of water molecules on the flat surface of well-ordered self-assembled monolayers (SAMs) of eight-carbon alkanethiolate chains bound to a gold substrate, as the character of ...
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History
- Published In Issue January 31, 2008
- Received October 23, 2007
Revised December 12, 2007
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