核磁共振(Nuclear Magnetic Resonance，NMR)冻融法是当前研究材料内孔径结构的有效方法，通过分析分子处于限域环境导致的熔融性质差异，结合核磁共振的高度敏感性，能对材料孔结构进行精准的分布分析。相较于传统的氮气吸附法与压汞法，核磁共振冻融法有其独特的优势。使用低场核磁共振纳米孔径仪对分子筛SBA-15 与多孔型聚苯乙烯进行冻融条件下的孔径测试，分别得到了孔径分布曲线，占比最高的孔径分别为3。8 nm与140 nm。NMR冻融测试法可以成为表征材料孔径的基础方法之一。
NMR Cryoporometry Characterization of Pore Size of Molecular Sieves and Porous Polystyrene
NMR cryoporometry is an efficient method to study pore structure,which can accurately analyze the distribution of material pore structure by analyzing the melting differences caused by the confined environment of molecules,combined with the high sensitivity of NMR.Compared with the traditional nitrogen adsorption method and mercury intrusion method,the NMR cryoporometry has its unique advantages.A low-field NMR nanopore analyzer was used to measure the pore size of molecular sieve SBA-15 and polystyrene by freeze-thaw method,and pore size distributions were obtained,giving the pore size with the highest proportion at 3.8 nm and 140 nm respectively.NMR cryoporometry can be one of the basic methods for characterizing the pore size of materials.
nuclear magnetic resonanceporous materialspolymercryoporometry
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