Abstract
The thickness of CO_2 hydrate membrane formed at the interface between liquid CO_2 and water has not been measured directly yet since the pressure of hydrate forming region is over 4.5 MPa. The purpose of the present study is to evaluate its thickness by high-pressure experiments at 40〜50MPa, pressures equivalent to the deep ocean where CO_2 can stably be stored. We examined the method to measure its thickness using the laser light interfering method. As a result, its thickness was estimated to be the order of a few microns although it changes with the temperature.
