Tracer studies on the solid state

Hood, Gavin M (1964) Tracer studies on the solid state. PhD thesis, University of Glasgow.

Abstract

A Study of self-diffusion in plastic crystals has been, carried out using radioactive tracer techniques. Single crystals of cyclohexane and pivalic acid were used for the experiments. The choice of the above compounds was made because of the cubic symmetry of their crystal structures, and because activation energy values for self-diffusion in them had already been published. It was hoped to compare these results, which had been obtained from nuclear magnetic resonance measurements, with those of the present study. The cubic symmetry of the crystals would eliminate the problem of diffusion anisotropy. Methods were developed for the growth of large single crystals of cyclohexane and pivalic acid from the melt, based on the Bridgman technique. Radioactive forms of the two compounds were evaporated onto the end surfaces of cylindrical portions of their corresponding single crystals and allowed to diffuse. The radioactive cyclohexane was a carbon-14 form, obtained commercially. Titrated pivalic acid was made by an exchange technique, using; pivalic acid and titrated water. The diffusion periods were, for cyclohexane, 2 to 50 hours In the temperature range -30

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Additional Information: Adviser: J N Sherwood
• Keywords: Plastics
• Date of Award: 1964
• Depositing User: Enlighten Team
• Unique ID: glathesis:1964-73350
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 14 Jun 2019 08:56
• Last Modified: 14 Jun 2019 08:56
• URI: https://theses.gla.ac.uk/id/eprint/73350