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).
Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japan.
This article was published in the following journal.
Name: The journal of physical chemistry. B
Medical and Biotech [MESH] Definitions
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.
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)
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.
Procedures or techniques used to keep food from spoiling.
Structure, stability, and reactivity of clathrate hydrates with or without hydrogen encapsulation are studied using standard density functional calculations. Conceptual density functional theory based...
Although thermal expansion is a key factor in relation to the host-guest interaction of clathrate hydrates, few studies have investigated the thermal behavior of ionic clathrate hydrates. The existenc...
Three ionic clathrate hydrates of different water content are formed in the binary system tetrabutylammonium chloride-water. The data on heats of fusion of these hydrates measured by DSC are presented...
A new predictive computational method for classifying clathrate hydrate promoter molecules is presented, based on the interaction energies between potential promoters and the water networks of sII and...
The nucleation and growth of clathrate hydrates of a hydrophobic guest comparable to methane or carbon dioxide are studied by molecular dynamics simulations of two-phase systems. The crystallization p...
The purpose of this research study is to learn more about the effects of 0.12 ppm ozone exposure on humans. We know from other studies that exposure to levels of ozone that are seen on ba...
The ozone therapy has been coming up as a new therapeutic modality. Medicine has been practicing since XIX century and counted great results. It is indicated for the treatment of 260 diffe...
The principal purpose of this study is to identify hyper-responsive, responsive and non-responsive groups of healthy human subjects based on their airway neutrophilic response to ozone exp...
The purpose of this study is to compare the effect of ozone exposure on airway reactivity and inflammation in obese vs. non-obese adults.
The purpose of this study is to determine whether an intraarticular injection of Ozone into the knee joint is an effective therapy for pain control in patients with osteoarthritis of the k...