A 13C NMR study of the molecular dynamics and phase transition of confined benzene inside titanate nanotubes.
A 13C NMR study of the molecular dynamics and phase transition of confined benzene inside titanate nanotubes.
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钛酸盐纳米管内受限苯的分子动力学和相变的 13C NMR 研究。
DOI：
10.1021/ja051628i
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发表时间：
2005
影响因子：
15
通讯作者：
Yue Wu
中科院分区：
文献类型：
--
作者：
Xiao;Jing Wang;L. Cary;A. Kleinhammes;Yue Wu
本文研究了纳米约束对内径约为5.3 nm的钛酸盐纳米管中受限苯的分子动力学和相变的影响。对于富含13C的有机物，13C核自旋-自旋弛豫被证明是区分分子平移运动和重定向的灵敏工具，因此，在研究复杂相图方面，特别是在分离平移运动的相行为和分子重定向的相行为方面，比常用的1H和2H NMR更有优势。在这种方法中，明确地观察到在低于整体熔化温度的广泛温度范围内，密闭苯的平移运动的熔化发生。在260 K左右，液态苯的13C核自旋-自旋弛豫时间的突变表明，纳米约束诱导了两种拓扑结构不同的液相。
This work investigated the nanoconfinement effect on the molecular dynamics and phase transition of confined benzene inside titanate nanotubes with a uniform inner diameter of approximately 5.3 nm. For 13C-enriched organics, the 13C nuclear spin-spin relaxation was demonstrated as a sensitive tool to differentiate molecular translational motion and reorientation and, thus, was shown to be advantageous over the commonly employed 1H and 2H NMR for studying complex phase diagram, specifically, for separating the phase behavior of translational motion and the phase behavior of molecular reorientation. In such an approach, the melting of translational motion of confined benzene was explicitly observed to take place in a broad temperature range below the bulk melting temperature. The abrupt change of the 13C nuclear spin-spin relaxation time of the confined liquid benzene at about 260 K suggested that nanoconfinement induced two topologically distinct liquid phases.