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Oct 28, 2020 · We find that at a fixed temperature and solution composition, the induction time (τ) sequence for pure guest hydrate nucleation is τ(C 2 H 6) < τ(C 3 H 8) < τ(CH 4) < τ(H 2 S). A relatively small number of guest molecules with a shorter induction time for pure guest hydrate nucleation can promote the formation of initial nuclei of a mixed ...
Jun 7, 2021 · Here, we introduce an unprecedented concept of multimodal host–guest-complexation of dopants to simultaneously modulate the surface and bulk composition of perovskite films through a synergistic ...
Oct 5, 2016 · The characteristics of host–guest systems, such as molecular recognition, complexation, encapsulation, guest composition, and dynamic exchange, are manifested by changes in the chemical shifts (Δω) in the NMR spectrum. However, in cases where NMR signals cannot be detected, due to low concentrations, poor solubility, or relatively fast exchange, an alternative is needed.
Sep 14, 2016 · The uninvited guests had caused so much inconvenience and problem to us. Whenever we go somewhere we should always inform the hosts of our program in advance so that adequate arrangements can be made and everyone can enjoy the stay. Essay No. 02. An Unwelcome Guest.
Jul 20, 2007 · This study presents the influences of additional guest molecules such as C2H6, C3H8, and CO2 on methane hydrates regarding their thermal behavior. For this purpose, the onset temperatures of decomposition as well as the enthalpies of dissociation were determined for synthesized multicomponent gas hydrates in the range of 173−290 K at atmospheric pressure using a Calvet heat-flow calorimeter. Furthermore, the structures and the compositions of the hydrates were obtained using X-ray ...
Classical molecular dynamics simulations of mixed CH4–CO2 gas hydrates provide a thorough analysis of the energetics of both pure CH4 and CO2 hydrates and three intermediate compositions along the (CH4)1–x(CO2)x·5.75(H2O) solid solution. The energy is broken into guest–guest, guest–host, and host–host contributions. Radial distribution functions and three-dimensional density distributions provide insight into the changes in guest orientation and interactions with the host ...
From these results, it is inferred that the guest gas composition in the liquid phase would be the controlling factor for the crystal growth of CH 4 + CO 2 hydrates. The crystal growth characteristics depending on the guest composition in the liquid phase should be taken into account for the process design of the hydrate-based CH 4 /CO 2 separation.
