BackgroundThe anomalous properties of water have been of great interest for generations of scientists. However the impact of small amount of deuterium content which is always present in water has never been explored before. For the first time the fundamental properties of deuterium depleted (light) water at 4°C and 20°C are here presented.ResultsThe obtained results show the important role of the deuterium in the properties of bulk water. At 4°C the lowest value of the kinematic viscosity (1.46 mm2/s) has been found for 96.5 ppm D/H ratio. The significant deviation in surface tension values has been observed in deuterium depleted water samples at the both temperature regimes. The experimental data provides direct evidence that density, surface tension and viscosity anomalies of water are caused by the presence of variable concentration of deuterium which leads to the formation of water clusters of different size and quantity.ConclusionsThe investigated properties of light water reveal the origin of the water anomalies. The new theoretical model of cluster formation with account of isotope effect is proposed.

No abstract

The article has investigated osmosis transfer through a polymer semi permeable membrane of water having a different concentration of deuterium in the course of direct osmosis. For the first time osmosis transfer of water isotopologues-deuterium and oxygen 18-through the polymer semi perme able membrane separating light and heavy water has been detected. The article presents results indicating that isotope osmosis suppresses osmotic stream existing owing to different concentration of chemical components dissolved in light and heavy waters.