Observations on the nucleation of ice VII in compressed water
Water can freeze upon multiple shock compression, but the window material determines the pressure of the phase transition. Several plate impact experiments were conducted with liquid targets on a single-stage gas gun, diagnosed simultaneously using photonic doppler velocimetry (PDV) and high speed i...
| Autori principali: | , , , |
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| Natura: | Conference item |
| Pubblicazione: |
AIP Publishing
2017
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| _version_ | 1826268423281180672 |
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| author | Stafford, S Chapman, D Bland, S Eakins, D |
| author_facet | Stafford, S Chapman, D Bland, S Eakins, D |
| author_sort | Stafford, S |
| collection | OXFORD |
| description | Water can freeze upon multiple shock compression, but the window material determines the pressure of the phase transition. Several plate impact experiments were conducted with liquid targets on a single-stage gas gun, diagnosed simultaneously using photonic doppler velocimetry (PDV) and high speed imaging through the water. The experiments investigated why silica windows instigate freezing above 2.5 GPa whilst sapphire windows do not until 7 GPa. We find that the nucleation of ice occurs on the surfaces of windows and can be affected by the surface coating suggesting the surface energy of fused silica, likely due to hydroxyl groups, encourages nucleation of ice VII crystallites. Aluminium coatings prevent nucleation and sapphire surfaces do not nucleate until approximately 6.5 GPa. This is believed to be the threshold pressure for the homogeneous nucleation of water. |
| first_indexed | 2024-03-06T21:09:26Z |
| format | Conference item |
| id | oxford-uuid:3da2525c-6fbd-45e2-9eaf-c4ef4e802733 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T21:09:26Z |
| publishDate | 2017 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:3da2525c-6fbd-45e2-9eaf-c4ef4e8027332022-03-26T14:20:32ZObservations on the nucleation of ice VII in compressed waterConference itemhttp://purl.org/coar/resource_type/c_5794uuid:3da2525c-6fbd-45e2-9eaf-c4ef4e802733Symplectic Elements at OxfordAIP Publishing2017Stafford, SChapman, DBland, SEakins, DWater can freeze upon multiple shock compression, but the window material determines the pressure of the phase transition. Several plate impact experiments were conducted with liquid targets on a single-stage gas gun, diagnosed simultaneously using photonic doppler velocimetry (PDV) and high speed imaging through the water. The experiments investigated why silica windows instigate freezing above 2.5 GPa whilst sapphire windows do not until 7 GPa. We find that the nucleation of ice occurs on the surfaces of windows and can be affected by the surface coating suggesting the surface energy of fused silica, likely due to hydroxyl groups, encourages nucleation of ice VII crystallites. Aluminium coatings prevent nucleation and sapphire surfaces do not nucleate until approximately 6.5 GPa. This is believed to be the threshold pressure for the homogeneous nucleation of water. |
| spellingShingle | Stafford, S Chapman, D Bland, S Eakins, D Observations on the nucleation of ice VII in compressed water |
| title | Observations on the nucleation of ice VII in compressed water |
| title_full | Observations on the nucleation of ice VII in compressed water |
| title_fullStr | Observations on the nucleation of ice VII in compressed water |
| title_full_unstemmed | Observations on the nucleation of ice VII in compressed water |
| title_short | Observations on the nucleation of ice VII in compressed water |
| title_sort | observations on the nucleation of ice vii in compressed water |
| work_keys_str_mv | AT staffords observationsonthenucleationoficeviiincompressedwater AT chapmand observationsonthenucleationoficeviiincompressedwater AT blands observationsonthenucleationoficeviiincompressedwater AT eakinsd observationsonthenucleationoficeviiincompressedwater |