Clathrate hydrates for ozone preservation.
Summary of "Clathrate hydrates for ozone preservation."
We report the experimental evidence for the preservation of ozone (O(3)) encaged in a clathrate hydrate. Although ozone is an unstable substance and is apt to decay to oxygen (O(2)), it may be preserved for a prolonged time if it is encaged in hydrate cavities in the form of isolated molecules. This possibility was assessed using a hydrate formed from an ozone + oxygen gas mixture coexisting with carbon tetrachloride or xenon. Each hydrate sample was stored in an air-filled container at atmospheric pressure and a constant temperature in the range between -20 and 2 degrees C and was continually subjected to iodometric measurements of its fractional ozone content. Such chronological measurements and structure analysis using powder X-ray diffraction have revealed that ozone can be preserved in a hydrate-lattice structure for more than 20 days at a concentration on the order of 0.1% (hydrate-mass basis).
Affiliation
Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japan.
Journal Details
This article was published in the following journal.
Name: The journal of physical chemistry. B
ISSN: 1520-5207
Pages: 11430-5
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20707330
- DOI: http://dx.doi.org/10.1021/jp105031n
Medical and Biotech [MESH] Definitions
Chlorofluorocarbons
A series of hydrocarbons containing both chlorine and fluorine. These have been used as refrigerants, blowing agents, cleaning fluids, solvents, and as fire extinguishing agents. They have been shown to cause stratospheric ozone depletion and have been banned for many uses.
Spectrophotometry, Ultraviolet
Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Ozone
An unstable triatomic form of oxygen, O3, that exists in the atmosphere in varying proportions. It is produced continuously in the outer layers of the atmosphere by the action of solar UV-radiation on the oxygen of the air.
Food Preservation
Procedures or techniques used to keep food from spoiling.
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