Use this URL to cite or link to this record in EThOS:
Title: An experimental study on the dynamic compression and subsequent freezing of water
Author: Stafford, Samuel John Piney
ISNI:       0000 0004 6059 1930
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2015
Availability of Full Text:
Access from EThOS:
Access from Institution:
Previous work has shown that under quasi-isentropic compression above 2.5 GPa water may enter the phase region of ice VII. The liquid remains mostly metastable whilst ice nucleates sporadically over ~100 ns. The phase change occurred reliably when water was compressed between silica surfaces but was not observed when these were made from sapphire. Through further quasi-isentropic compression experiments on a gas gun this work has determined that the nucleation initiates at the window-water interface and that initiation likely depends on the surface energy of the silica. Sapphire, aluminium and reactively sputtered silica did not nucleate the phase change and the water remained metastable. The limit of this metastable liquid water was thought to be at 7 GPa. Through experiments with both silica and sapphire the threshold was found to be closer to 6.5 GPa and appears to cause a homogeneous phase change nucleating throughout the volume of water and independent of surfaces.
Supervisor: Bland, Simon ; Eakins, Daniel Sponsor: Atomic Weapons Establishment
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral