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Water Interactions with Acetic Acid Layers on Ice and Graphite

Papagiannakopoulos, Panos; Kong, Xiangrui; Thomson, Erik S and Pettersson, Jan B. C. (2014) In The Journal of Physical Chemistry Part B 118(47). p.13333-13340
Abstract
Adsorbed organic compounds modify the properties of environmental interfaces with potential implications for many Earth system processes. Here, we describe experimental studies of water interactions with acetic acid (AcOH) layers on ice and graphite surfaces at temperatures from 186 to 200 K. Hyperthermal D2O water molecules are efficiently trapped on all of the investigated surfaces, with only a minor fraction that scatters inelastically after an 80% loss of kinetic energy to surface modes. Trapped molecules desorb rapidly from both mu m-thick solid AcOH and AcOH monolayers on graphite, indicating that water has limited opportunities to form hydrogen bonds with these surfaces. In contrast, trapped water molecules bind efficiently to... (More)
Adsorbed organic compounds modify the properties of environmental interfaces with potential implications for many Earth system processes. Here, we describe experimental studies of water interactions with acetic acid (AcOH) layers on ice and graphite surfaces at temperatures from 186 to 200 K. Hyperthermal D2O water molecules are efficiently trapped on all of the investigated surfaces, with only a minor fraction that scatters inelastically after an 80% loss of kinetic energy to surface modes. Trapped molecules desorb rapidly from both mu m-thick solid AcOH and AcOH monolayers on graphite, indicating that water has limited opportunities to form hydrogen bonds with these surfaces. In contrast, trapped water molecules bind efficiently to AcOH-covered ice and remain on the surface on the observational time scale of the experiments (60 ms). Thus, adsorbed AcOH is observed to have a significant impact on waterice surface properties and to enhance the water accommodation coefficient compared to bare ice surfaces. The mechanism for increased water uptake and the implications for atmospheric cloud processes are discussed. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
SUPERCOOLED SULFURIC-ACID, SURFACE, NITRIC-ACID, ORGANIC-ACIDS, CARBOXYLIC-ACIDS, COLLISION DYNAMICS, GAS-PHASE, HYDROGEN-BONDING INTERACTIONS, ELASTIC HELIUM SCATTERING, MOLECULAR-DYNAMICS SIMULATIONS
in
The Journal of Physical Chemistry Part B
volume
118
issue
47
pages
13333 - 13340
publisher
The American Chemical Society
external identifiers
  • scopus:84914170298
ISSN
1520-5207
DOI
10.1021/jp503552w
project
MERGE
language
English
LU publication?
no
id
96f6c75e-e3ac-47a8-9611-5bffee005331 (old id 7515515)
date added to LUP
2015-07-08 14:49:46
date last changed
2017-04-09 04:35:30
@article{96f6c75e-e3ac-47a8-9611-5bffee005331,
  abstract     = {Adsorbed organic compounds modify the properties of environmental interfaces with potential implications for many Earth system processes. Here, we describe experimental studies of water interactions with acetic acid (AcOH) layers on ice and graphite surfaces at temperatures from 186 to 200 K. Hyperthermal D2O water molecules are efficiently trapped on all of the investigated surfaces, with only a minor fraction that scatters inelastically after an 80% loss of kinetic energy to surface modes. Trapped molecules desorb rapidly from both mu m-thick solid AcOH and AcOH monolayers on graphite, indicating that water has limited opportunities to form hydrogen bonds with these surfaces. In contrast, trapped water molecules bind efficiently to AcOH-covered ice and remain on the surface on the observational time scale of the experiments (60 ms). Thus, adsorbed AcOH is observed to have a significant impact on waterice surface properties and to enhance the water accommodation coefficient compared to bare ice surfaces. The mechanism for increased water uptake and the implications for atmospheric cloud processes are discussed.},
  author       = {Papagiannakopoulos, Panos and Kong, Xiangrui and Thomson, Erik S and Pettersson, Jan B. C.},
  issn         = {1520-5207},
  keyword      = {SUPERCOOLED SULFURIC-ACID,SURFACE,NITRIC-ACID,ORGANIC-ACIDS,CARBOXYLIC-ACIDS,COLLISION DYNAMICS,GAS-PHASE,HYDROGEN-BONDING INTERACTIONS,ELASTIC HELIUM SCATTERING,MOLECULAR-DYNAMICS SIMULATIONS},
  language     = {eng},
  number       = {47},
  pages        = {13333--13340},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Water Interactions with Acetic Acid Layers on Ice and Graphite},
  url          = {http://dx.doi.org/10.1021/jp503552w},
  volume       = {118},
  year         = {2014},
}