NMR/MRI study of clathrate hydrate mechanisms.
NMR/MRI study of clathrate hydrate mechanisms.
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DOI：
10.1021/jp052071w
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发表时间：
2005-09
期刊：
影响因子：
--
通讯作者：
Shuqiang Gao;W. House;Walter G Chapman
中科院分区：
文献类型：
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作者：
Shuqiang Gao;W. House;Walter G Chapman
笼形水合物在许多方面都非常重要。然而，由于能够提供分子水平动态和结构信息的实验技术的限制，对于所有水合物应用至关重要的水合物形成和解离机制仍然没有得到很好的理解。核磁共振已被证明是一种无创测量分子水平动态信息的强大工具。在这项工作中，我们测量了液态氧化氘 (D2O) 中四氢呋喃 (THF) 在 THF 水合物形成和解离过程中的核磁共振 (NMR) 自旋晶格弛豫时间 (T1)。同时，我们还使用磁共振成像（MRI）来监测水合物的形成和解离模式。结果表明，固体水合物显着影响共存流体结构。确定了残余结构的分子证据。根据 NMR/MRI 观察结果提出了水合物形成和解离机制。
Clathrate hydrates are of great importance in many aspects. However, hydrate formation and dissociation mechanisms, essential to all hydrate applications, are still not well understood due to the limitations of experimental techniques capable of providing dynamic and structural information on a molecular level. NMR has been shown to be a powerful tool to noninvasively measure molecular level dynamic information. In this work, we measured nuclear magnetic resonance (NMR) spin lattice relaxation times (T1's) of tetrahydrofuran (THF) in liquid deuterium oxide (D2O) during THF hydrate formation and dissociation. At the same time, we also used magnetic resonance imaging (MRI) to monitor hydrate formation and dissociation patterns. The results showed that solid hydrate significantly influences coexisting fluid structure. Molecular evidence of residual structure was identified. Hydrate formation and dissociation mechanisms were proposed based on the NMR/MRI observations.