sII Structural Transitions from Binary Mixtures of Simple sI Formers

Previous work has shown structure II structural transitions for binary guest mixtures of simple structure I formers. This phenomenon was investigated using the hydrate statistical mechanical model developed by van der Waals and Platteeuw. Langmuir constants were employed to suggest that molecules at either extrema of the sI size range will form sII when mixed together. Thus, CO2, an iIntermediate-sized sI former, was determined not to undergo a sII transition when combined with another sI former. Correlations between the Kihara potential parameters and physical properties were also made for pure hydrate formers.