简述核磁共振冷冻测孔法的原理及应用

A Brief Introduction to the Principle and Application of Nuclear Magnetic Resonance Cryoporometry

核磁共振冷冻测孔法是将核磁共振检测技术与吉布斯、托马斯等研究的受限材料的相变理论相结合,用来表征多孔材料孔径分布的新方法。由于样品内不同孔径中液体的相变温度不同,通过NMR可获得样品内液相体积随温度的变化从而间接表征样品的孔径分布。研究表明此方法相比于传统的测孔方法有其独特的优点,应用前景广阔。目前国外对此项技术已经开展了广泛而深入的研究,但在国内的研究才刚刚起步。通过总结外文文献,介绍了该方法的理论基础、实验方法以及研究进展等情况,并简要分析了其在水泥基材料中的应用前景。

Nuclear magnetic resonance cryoporometry is a novel method to characterize pore size distribution, combining NMR spectroscopy and the theory of phase transition of restricted materials which was studied by Gibbs, Thomson, etc. Due to the different phase transition point of restricted liquid within pores of various size, the pore size distribution can be derived via obtaining the liquid phasets signal intensity as a function of the temperature by NMR. Compared with traditional methods of pore characterizing, it has some unique advantages. The method has been well studied abroad, while the studies are barely found in china. Through summarizing the foreign references, the theory, experiment method, research progress are briefly introduced and the application in cementitious materials is simply analyzed.