ARS顶端装载型光学型闭循环低温恒温器X-19-OP

In Situ X‑Ray Diffraction Study on Hydrate Formation at Low Temperature in a High Vacuum

The condition for incorporating simple gases with H 2 O to form clathrate hydrates in protosolar nebula is a subject of topical interest. Methane and carbon dioxide clathrate hydrates have been speculated to exist in outer solar system bodies, but they have eluded direct detection so far. We have constructed a low-temperature and high-vacuum system to prepare and study clathrate hydrates by in situ synchrotron X-ray diffraction experiments.Upon heating, we found clathrate hydrates can be obtained from the codeposition of methane or carbon dioxide with water outside the equilibrium thermodynamic stability region under high vacuum. We suggested that the hydrate formation is assisted by the phase transformations in the ice, which provide the necessary activation energy to increase the mobility of the guest and water molecules. The results provide a new perspective on how “metastable” gas hydrate can be formed.

HVG

低温用道康宁真空脂 特性 • 良好的润滑性能和密封性能 • 低挥发性 • 优良的耐水性、耐化学品性能及耐高温和低温性能 组成 • 硅油 • 增稠剂 应用 • 化工设备的密封和润滑油脂 • 用于活塞阀、控制阀、流量计轴承、陶瓷活塞阀、灭火器阀门、水设备阀门、合成橡胶垫圈及密封圈在高温下使用时的润滑 • 真空和压力系统的密封用润滑油脂 • 用于双筒望远镜中O型环的润滑，防止精密镜头起雾