Stabilisation of low softening point petroleum pitch fibres by iodine treatment

A method using iodine has been developed for the stabilisation of low softening point (SP) pitch fibres that avoids air stabilisation in the production of carbon fibres (CF). The interaction between iodine and petroleum pitches has been studied by following the changes in the hydrogen content, aromatic or aliphatic, during the heat treatment of iodine-treated pitch fibres. Two low SP petroleum pitches were used and the iodine-treated pitch fibres were analysed by TGA, DSC, DRIFT, XPS and SEM. The results confirm that using this novel method pitches with low SP can be used to prepare CF with two advantages, compared with conventional methods. The stabilisation time is considerably reduced and treatments to increase the SP, usually required when low SP pitches are used to prepare CF, can be avoided.

Iodine ages of pore water at Hydrate Ridge, Cascadian continental margin

Hydrate Ridge off the coast of Oregon, USA, is a prime example for gas hydrate occurrences in active margin settings. It is part of the Cascadia Margin and was the focus of Ocean Drilling Program (ODP) Leg 204, which successfully recovered fluids from nine sites from the southern part of the ridge. Iodide concentrations in pore fluids associated with gas hydrates are strongly enhanced, by factors up to 5000 compared to seawater, which allows the use of this biophilic element as tracer for organic source regions. We applied the cosmogenic isotope 129I (T1/2=15.7 Ma) system to determine the age of the organic source formation responsible for the iodide enrichment. In all sites at ODP Leg 204, 129I/I ratios were found to decrease with depth to values around 250x10**-15, corresponding to minimum ages of 40 Ma, but in several sites, maxima in the 129I/I ratios point to the local addition of young iodide. The results indicate that a large amount of iodide was derived from deep accreted sediments of Eocene age, and that additional source regions provide iodide of Late Miocene age. The presence of old iodide in the pore waters suggests that fluid pathways are open to allow transport over large distances into the gas hydrate fields. The strong correlation between iodide and methane in hydrate fields coupled with the similarity in transport parameters in aqueous solutions suggests that a large fraction of methane in gas hydrates also has old sources and is transported into the present locations from source regions of Eocene age.

Radioactive iodine therapy for inpatients.

Mode of access: Internet.

Applications of iodine-123 in nuclear medicine : proceedings of a conference held in Rockville, Maryland, May 19-20, 1975.

Mode of access: Internet.

Food-chain relationships of iodine-131 in Nevada following the Sedan Test of July 1962 /

Prepared for the U.S Atomic Energy Commission.

Iodine inhalation study for Project Sedan : July 6, 1962 /

Final report.

Food-chain relationships of iodine-131 following two nuclear tests in Nevada,

Mode of access: Internet.

Devitalization of microorganisms by iodine,

Cover title.

The hydrolysis of Iodine and a reaction with "Propanol".

Mode of access: Internet.

Chlorine and chlorine products, including the manufacture of bleaching powder, hypochlorites, chlorates, etc., with sections on bromine, iodine, and hydrofluoric acid

"Literature" at the beginning of most chapters.

Removal of radioactive iodine by laboratory trickling filters /

Mode of access: Internet.