Abstract
Growth and inhibition of single crystals of ethylene oxide clathrate hydrate provide experimental accessibility to similar phenomena in methane clathrate hydrates. Ethylene oxide hydrate single crystals were grown from the supercooled melt as rhombic dodecahedra, exhibiting {1 1 0} as the slowest growing face. The addition of poly(N-vinylcaprolactam) (PVCap) or a random terpolymer of PVCap, poly(N-vinylpyrrolidone), and dimethylaminoethylmethacrylate causes small scale branching of crystals, but with a uniform crystal orientation. A few tenths of a weight percent of these additives cause complete crystal growth inhibition up to several degrees of supercooling.
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