NDLI: The solution flow through the nanochannel of MCM-41: a spin-probe study

Content Provider	Springer Nature Link
Author	Okazaki, M. Toriyama, K. Sawaguchi, N. Oda, K.
Copyright Year	2003
Abstract	A spin-probe electron spin resonance (ESR) study was made on the alcoholic 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 sealing 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.
Starting Page	435
Ending Page	444
Page Count	10
File Format	PDF
ISSN	09379347
Journal	Applied Magnetic Resonance
Volume Number	23
Issue Number	3-4
e-ISSN	16137507
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solid State Physics Spectroscopy/Spectrometry Physical Chemistry Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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