Weak interactions between water and clathrate-forming gases at low pressures
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Using scanning probe microscopy and temperature programed desorption we examined the interaction between water and two common clathrate-forming gases, methane and isobutane, at low temperature and low pressure. Water co-deposited with up to 10–1 mbar methane or 10–5 mbar isobutane at 140 K onto a Pt(111) substrate yielded pure crystalline ice, i.e., the exposure to up to ~ 107 gas molecules for each deposited water molecule did not have any detectable effect on the growing films. Exposing metastable, less than 2 molecular layers thick, water films to 10–5 mbar methane does not alter their morphology, suggesting that the presence of the Pt(111) surface is not a strong driver for hydrate formation. This weak water–gas interaction at low pressures is supported by our thermal desorption measurements from amorphous solid water and crystalline ice where 1 ML of methane desorbs near ~ 43 K and isobutane desorbs near ~ 100 K. As a result, similar desorption temperatures were observed for desorption from amorphous solid water.
- Research Organization:
- Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1236221
- Alternate ID(s):
- OSTI ID: 1243275
OSTI ID: 1244762
- Report Number(s):
- SAND--2015-3713J; 583780
- Journal Information:
- Surface Science, Journal Name: Surface Science Journal Issue: C Vol. 641; ISSN 0039-6028
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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