用核磁共振光谱法探究亲水性表面对界面水动力学的影响。
Impact of Hydrophilic Surfaces on Interfacial Water Dynamics Probed with NMR Spectroscopy.
作者信息
Yoo Hyok, Paranji Rajan, Pollack Gerald H
机构信息
Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States.
出版信息
J Phys Chem Lett. 2011 Feb 18;2(6):532-536. doi: 10.1021/jz200057g.
Abstract
In suspensions of Nafion beads and of cationic gel beads, NMR spectroscopy showed two water-proton resonances, one representing intimate water layers next to the polymer surface, the other corresponding to water lying beyond. Both resonances show notably shorter spin-lattice relaxation times (T1) and smaller self-diffusion coefficients (D) indicating slower dynamics than bulk water. These findings confirm the existence of highly restricted water layers adsorbed onto hydrophilic surfaces and dynamically stable water beyond the first hydration layers. Thus, aqueous regions on the order of micrometers are dynamically different from bulk water.
摘要
在全氟磺酸离子交换树脂珠和阳离子凝胶珠的悬浮液中，核磁共振光谱显示出两个水质子共振峰，一个代表聚合物表面附近的紧密水层，另一个对应于远离聚合物表面的水。这两个共振峰均显示出自旋晶格弛豫时间（T1）显著缩短，自扩散系数（D）较小，表明其动力学比体相水更慢。这些发现证实了在亲水性表面上存在高度受限的水层以及在第一水化层之外存在动态稳定的水。因此，微米级的水相区域在动力学上与体相水不同。
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