ORCID Profile
0000-0001-6839-9765
Current Organisation
NASA Jet Propulsion Laboratory
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Publisher: American Chemical Society (ACS)
Date: 25-04-2023
Publisher: International Union of Crystallography (IUCr)
Date: 20-11-2020
DOI: 10.1107/S1600576720014028
Abstract: Acetylene and ammonia are known to form a stable orthorhombic co-crystal under the surface conditions of Saturn's moon Titan (1.5 bar = 150 kPa, 94 K). Such a material represents a potential new class of organic minerals that could play an important role in Titan's geology. In this work, the thermal expansion of this co-crystalline system has been derived from in situ powder X-ray diffraction data obtained between 85 and 120 K. The results indicate significant anisotropy, with the majority of the expansion occurring along the c axis (∼2% over the temperature range of interest). Rietveld refinements reveal little change to the structure compared with that previously reported by Boese, Bläser & Jansen [ J. Am. Chem. Soc. (2009), 131 , 2104–2106]. The expansion is consistent with the alignment of C—H...N interactions along the chains in the a and b axes, and weak intermolecular bonding in the structural layers along the c axis.
Publisher: American Chemical Society (ACS)
Date: 23-07-2021
Publisher: American Chemical Society (ACS)
Date: 05-10-2022
Publisher: American Geophysical Union (AGU)
Date: 11-02-2020
DOI: 10.1029/2019GL086265
Abstract: Liquid ethane is present in the lakes and seas observed on Titan's surface by the Cassini‐Huygens mission. While interaction between liquid hydrocarbons and water ice is expected to result in the formation of clathrate hydrates, such reaction (and its kinetics) has not yet been demonstrated for cryogenic liquids under relevant planetary conditions. In this paper, we report the first experimental evidence for rapid formation of clathrates upon direct contact of liquid ethane with water ice at 1 bar using micro‐Raman spectroscopy. Kinetics experiments conducted in the temperature range 150–173 K yield an activation energy of 14.8 ± 2.2 kJ/mol, which is suggestive of a diffusion‐controlled mechanism for clathrate formation. This implies that a clathrate reservoir can form within seasonal time scales on Titan if liquid ethane comes into contact with a pre‐existing icy bedrock, which may hold important implications for the structure and dynamics of Titan's crust and its global evolution.
Publisher: American Chemical Society (ACS)
Date: 17-07-2020
No related grants have been discovered for Tuan Vu.