Pizzanelli Silvia, Kababya Shifi, Frydman Veronica, Landau Miron, Vega Shimon
Weizmann Institute of Science, Department of Chemical Physics and Chemical Research Support Unit, Rehovot 76100, Israel.
J Phys Chem B. 2005 Apr 28;109(16):8029-39. doi: 10.1021/jp044389e.
In this study we show how deuterium magic-angle spinning NMR spectroscopy can be used to investigate the adsorption-desorption kinetics of molecules in solution at surface-liquid interfaces. An aqueous solution of deuterium-labeled tetraalanine is inserted in the pores of MCM-41 mesoporous material, and its 2H MAS NMR spectrum is measured as a function of temperature and fraction of filling of the pores. Prior to this study, the different types of water in MCM-41 are characterized as a function of water loading of the pores. Analysis of 2H MAS sideband line shapes enabled the determination of the adsorption and desorption rates and the activation energies of desorption.
在本研究中，我们展示了如何利用氘魔角旋转核磁共振光谱来研究表面 - 液体界面处溶液中分子的吸附 - 解吸动力学。将氘标记的四丙氨酸水溶液插入MCM - 41介孔材料的孔中，并测量其2H MAS NMR光谱随温度和孔填充分数的变化。在本研究之前，已根据孔的水负载量对MCM - 41中不同类型的水进行了表征。对2H MAS边带线形的分析使得能够确定吸附和解吸速率以及解吸的活化能。
