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首页> 外文期刊>Applied Magnetic Resonance >The solution flow through the nanochannel of MCM-41: a spin-probe study
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The solution flow through the nanochannel of MCM-41: a spin-probe study

机译：溶液流过MCM-41的纳米通道：自旋探针研究

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A spin-probe electron spin resonance (ESR) study was made on the aledholic solution flowing through a quartz column packed with MCM-41 to clarify the dynamics of the liquid molecules in the nanochannel. The ESR spectra of a few hydrophobic spin probes showed that they undergo rotational diffusion preferentially along the longest molecular axis, indicating that,the nanochannel is effectively narrowed further for these radicals by the influence of the solvent. Since almost identical ESR spectra were observed for the static samples, which were prepared in vacuo by introducing the solutions into the quartz tube with the MCM-41 powder and seating off, the solution in the above-mentioned experiment should really flow through the nanochannel of MCM-41. Although-a laminar flow is expected from the classical theory, the calculated flow rate is almost zero. In addition, the duration for the spin-probe molecules to flow through the column was basically not dependent on their affinity to the silica surface. To explain all these phenomena, we propose a model that the liquid molecules flow collectively by slipping on the surface of the nanochannel. [References: 13]
机译：对流经装有MCM-41的石英柱的无酒精溶液进行了自旋探针电子自旋共振（ESR）研究，以阐明纳米通道中液体分子的动力学。少数疏水性自旋探针的ESR光谱表明，它们优先沿最长的分子轴进行旋转扩散，表明这些自由基在溶剂的影响下有效地进一步缩小了纳米通道。由于观察到的静态样品几乎具有相同的ESR光谱，这些样品是通过将溶液与MCM-41粉末一起引入石英管并静置而在真空中制备的，因此上述实验中的溶液应确实流过纳米管的纳米通道。 MCM-41。尽管从经典理论上可以预期到层流，但是计算出的流速几乎为零。此外，自旋探针分子流过色谱柱的时间基本上不取决于它们对二氧化硅表面的亲和力。为了解释所有这些现象，我们提出了一个模型，即液体分子通过在纳米通道表面上滑动而共同流动。 [参考：13]

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