University of Sussex
Browse
IPA_published.pdf (1.81 MB)

Desorption and crystallisation of binary 2-propanol and water ices adsorbed on graphite

Download (1.81 MB)
journal contribution
posted on 2023-06-09, 08:43 authored by Sean A Ayling, Daren J Burke, Tara L Salter, Wendy BrownWendy Brown
Alcohols, including 2-propanol, are important in a range of industrial applications, and are also found in cold astrophysical environments such as comets and interstellar space, where they are often frozen out on carbonaceous grain surfaces. In these regions, the interaction between alcohols and water ice plays a crucial role in the surface chemistry. We have therefore undertaken a detailed temperature programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS) investigation to elucidate the physical chemistry of the adsorption, desorption and crystallisation of 2-propanol and water ices adsorbed on graphite at 26 K. Hydrogen bonding plays a critical role in the physical chemistry of both pure 2-propanol and of binary ices containing 2-propanol and water ice. Monolayer 2-propanol physisorbs strongly on the graphite surface, and with increasing coverage, annealing leads to the desorption of first amorphous, and then crystalline, 2-propanol multilayers. Crystallisation is also evident in RAIR spectra, which show marked changes on annealing of the adsorbed 2-propanol layer. In binary ice systems containing amorphous solid water and 2-propanol, the desorption and crystallisation of the alcohol is modified. The water ice inhibits the 2-propanol crystallisation and gives rise to co-desorption in TPD. In addition, the 2-propanol also strongly influences the behaviour of the water, with even small amounts of the alcohol changing the crystallisation kinetics of water ice, leading to the desorption of water solely in its amorphous form.

Funding

Evolution of ices: From molecular cloud to ocean; G1613; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M000869/1

History

Publication status

  • Published

File Version

  • Published version

Journal

RSC Advances

ISSN

2046-2069

Publisher

Royal Society of Chemistry

Issue

7

Volume

2017

Page range

51621-51631

Department affiliated with

  • Chemistry Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-11-07

First Open Access (FOA) Date

2017-11-07

First Compliant Deposit (FCD) Date

2017-11-07

Usage metrics

    University of Sussex (Publications)

    Categories

    No categories selected

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC