Tracer studies on the solid state - self-diffusion in aromatic solids

White, David James (1966) Tracer studies on the solid state - self-diffusion in aromatic solids. PhD thesis, University of Glasgow.

Abstract

Naphthalene and Anthracene were purified and single crystals of the materials grown by the Bridgmann-Stockbarger method. Self-diffusion coefficients were measured by tracer-sectioning technique in pure and doped single crystals of naphthalene, in polycrystalline naphthalene, and In monocrystalline of anthracene. Additional measurements on monocrystals of napthalene were made by a surface-decrease method. From the variation of diffusion coefficient with temperature the activation energies of diffusion and the Arrhenius pre-exponential factors were calculated. Self-diffusion in both naphthalene and andthracene was fond to be an extrinsic process, the diffusion coefficient at a particular temperature decreasing with increasing perfection of the crystal. Annealing was found to reduce the diffusion coefficient, D, varied with absolute temperature, T, according to the Arrhenius relationship D = D0 exp (E/RT), where E is the activation energy for diffusion, D the pre-exponential or frequency factor, and R 'the Ideal Gas constant. For annealed single crystals of naphthalene E was found to be 34,9kcal. per mole, and D0 2.5x10.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Additional Information: Adviser: J N Sherwood
• Keywords: Organic chemistry
• Date of Award: 1966
• Depositing User: Enlighten Team
• Unique ID: glathesis:1966-72413
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 24 May 2019 15:12
• Last Modified: 24 May 2019 15:12
• URI: https://theses.gla.ac.uk/id/eprint/72413