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• W4366976746 startingPage "1162" @default.
• W4366976746 abstract "Clathrate hydrates of methane as well as its ambient pressure analogues of tetrahydrofuran (THF) and cyclopentane have been reported to undergo partial dissociation at temperatures as low as ∼200 K in the presence of ammonia (NH3). This behavior has significant implications for the hydrocarbon cycle on Titan because the destabilization of subsurface clathrate deposits could contribute to the replenishment of atmospheric methane. In addition, the ternary H2O–THF–NH3 system exhibits great chemical complexity, with a previous report of an unknown THF–NH3-rich phase. In this study, we have investigated the H2O–THF–NH3 system at 1 bar with X-ray diffraction and Raman spectroscopy to further characterize the inhibiting effect of ammonia on clathrates and the various phases formed between 90 and 280 K. Our data are in agreement with previous Raman spectroscopy and calorimetry studies and confirm the partial dissociation of THF clathrates in aqueous solutions of ammonia between 200 and 270 K. Transposing this effect to methane clathrates implies that the presence of small amounts of ammonia in Titan’s icy shell could trigger partial melting of these subsurface methane reservoirs. Furthermore, these new data enabled the characterization of a previously unknown THF–NH3-rich phase observed below 220 K. Our analysis suggests a trigonal crystal system for this novel compound, with a unit cell volume of 1617 Å3 at 90 K." @default.
• W4366976746 created "2023-04-27" @default.
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• W4366976746 date "2023-04-25" @default.
• W4366976746 modified "2023-10-16" @default.
• W4366976746 title "Phase Behavior of the Ternary H₂O–THF–NH₃ System under Cryogenic Conditions: Implications for the Destabilization of Clathrate Hydrates on Titan" @default.
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• W4366976746 doi "https://doi.org/10.1021/acsearthspacechem.3c00055" @default.
• W4366976746 hasPublicationYear "2023" @default.
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