(309d) Structures of Ice Confined in Nanopores; Pressure Enhancement and Wetting Energy Effects
AIChE Annual Meeting
2022
2022 Annual Meeting
Engineering Sciences and Fundamentals
Honorary sessions for Keith Gubbins' 85th birthday
Tuesday, November 15, 2022 - 1:24pm to 1:42pm
by quasi two-dimensional voids, forming narrow slit-shaped pores. The structure of ice in cylindrical nanocarbons pores (CMK-3), which are the reverse carbon replica of silica SBA-15 matrices, was also analyzed. The results show strong evidence for the presence of both hexagonal and cubic forms of ice confined in all of the systems studied. However, according to recently published work [3,4], the cubic form of ice is not exactly cubic, but contains stacking faults instead of an ordered arrangement of two dimensional layers. This form of ice is in fact a stacking-disordered material containing cubic sequences interlaced with hexagonal sequences. The structure of the confined ice observed in our experiments in nanocarbons pores corresponds to disordered stacking ice Isd,, which was identified as having the space group P3m1 [4,5,6,7]. We observe,that the stacking disorder can vary in complexity depending on the nature of the pore walls, pore size and on the prevailing thermal conditions during the ice formation. These crystal forms, which occur in ice bulk only at temperatures below 180 K in the case of cubic ice, and at pressures of hundreds of MPa are stabilized by the confinement.
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Financial support for the National Centre of Science grant No UMO-2016/ 22/A/ST4/00092 is gratefully acknowledged