Anomalous Depletion of Pore-Confined Carbon Dioxide upon Cooling below the Bulk Triple Point: An In Situ Neutron Diffraction Study

The phase behavior of sorbed CO{2} in an ordered mesoporous silica sample (SBA-15) was studied by neutron diffraction. Surprisingly, upon cooling our sample below the bulk critical point, confined CO{2} molecules neither freeze nor remain liquid as expected, but escape from the pores. The phenomenon...

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Published in:Physical review letters 2016-01, Vol.116 (2), p.025502-025502, Article 025502
Main Authors: Stefanopoulos, K L, Katsaros, F K, Steriotis, Th A, Sapalidis, A A, Thommes, M, Bowron, D T, Youngs, T G A
Format: Article
Language:English
Subjects:
Carbon dioxide
Cooling
Depletion
Fluid dynamics
Liquids
Molecular sieves
Neutron diffraction
Porosity
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container_title Physical review letters
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description The phase behavior of sorbed CO{2} in an ordered mesoporous silica sample (SBA-15) was studied by neutron diffraction. Surprisingly, upon cooling our sample below the bulk critical point, confined CO{2} molecules neither freeze nor remain liquid as expected, but escape from the pores. The phenomenon has additionally been confirmed gravimetrically. The process is reversible and during heating CO{2} refills the pores, albeit with hysteresis. This depletion was for the first time observed in an ordered mesoporous molecular sieve and provides new insight on the phase behavior of nanoconfined fluids.
doi_str_mv 10.1103/PhysRevLett.116.025502
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subjects Carbon dioxide
Cooling
Depletion
Fluid dynamics
Liquids
Molecular sieves
Neutron diffraction
Porosity
title Anomalous Depletion of Pore-Confined Carbon Dioxide upon Cooling below the Bulk Triple Point: An In Situ Neutron Diffraction Study
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