title: Nano-structured calcium silicate hydrate functionalised with iodine.
abstract: Nano-structured calcium silicate hydrate can physisorb or chemisorb iodine, making it interesting for medical or materials science applications, where a slow, controlled release of iodine is desired. It was found that iodine can be sorbed and released by applying the elemental halogen in solution, either as a gas or as a solid. At ambient temperatures the sorption and desorption process is quantitative and physical, meaning that the same amount of iodine is taken up and released. At temperatures above 32.5 degrees C (305.7K) iodine reacts with the calcium silicate hydrate forming a complex, which is stable above the sublimation temperature of iodine. The formation energy for the iodine calcium silicate hydrate complex was established to be 41.8+/-0.8kJmol(-1) by calorimetry and the nature of the complex was investigated using X-ray photoelectron spectroscopy.
authors.affiliation: School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, 6140 Wellington, New Zealand. thomas.borrmann@vuw.ac.nz
authors.forename: Thomas
authors.initials: T
authors.lastname: Borrmann
authors.forename: James H
authors.initials: JH
authors.lastname: Johnston
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: McFarlane
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Richardson
authors.forename: Sean J
authors.initials: SJ
authors.lastname: O'Connor