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首页> 外文期刊>Applied Magnetic Resonance >The Size Distribution of Core Shell Polymeric Capsules as Revealed by Low-Field NMR Diffusometry
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The Size Distribution of Core Shell Polymeric Capsules as Revealed by Low-Field NMR Diffusometry

机译:低场NMR扩散法揭示核壳聚合物胶囊的尺寸分布

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Time-dependent diffusion studies have been done on hexadecane molecules confined inside core shell polystyrene capsules in order to extract capsule-size distribution. The polymeric capsules were prepared by an emulsification-diffusion technique. The nuclear magnetic resonance (NMR) diffusometry technique implemented in our investigations is the so-called pulse gradient stimulated echo technique. With this technique, diffusion times between 20 and 500 ms could be probed. The distribution of the apparent diffusion coefficients was extracted using a numerical Laplace inversion. These data allowed us to obtain dimension distributions in good agreement with the direct observations from electron micrographs.
机译:为了限制胶囊大小分布,已经对限制在核壳聚苯乙烯胶囊内的十六烷分子进行了时间依赖性扩散研究。通过乳化-扩散技术制备聚合物胶囊。在我们的研究中实施的核磁共振(NMR)扩散测定技术是所谓的脉冲梯度激发回波技术。使用此技术,可以探测20到500毫秒之间的扩散时间。使用数值拉普拉斯反演提取表观扩散系数的分布。这些数据使我们能够获得与电子显微照片的直接观察结果非常一致的尺寸分布。

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