@article {254,
	title = {Remotely Detected NMR for the Characterization of Flow and Fast Chromatographic Separations Using Organic Polymer Monoliths},
	journal = {Analytical Chemistry},
	volume = {83},
	year = {2011},
	note = {Anal Chem798ZVTimes Cited:4Cited References Count:35},
	month = {Aug 1},
	pages = {6004-6010},
	abstract = {<p>An application of remotely detected magnetic resonance imaging is demonstrated for the characterization of flow and the detection of fast, small molecule separations within hypercrosslinked polymer monoliths. The hyper-cross-linked monoliths exhibited excellent ruggedness, with a transit time relative standard deviation of less than 2.1\%, even after more than 300 column volumes were pumped through at high pressure and flow. Magnetic resonance imaging enabled high. resolution intensity and velocity-encoded images of mobile phase flow through the monolith. The images confirm that the presence of a polymer monolith within the capillary disrupts the parabolic laminar flow profile that is characteristic of mobile phase flow within an open tube. As a result, the mobile phase and analytes are equally distributed in the radial direction throughout the monolith. Also, in-line monitoring of chromatographic separations of small molecules at high flow rates is shown. The coupling of monolithic chromatography columns and NMR provides both real-time peak detection and chemical shift information for small aromatic molecules. These experiments demonstrate the unique power of magnetic resonance, both direct and remote, in studying chromatographic processes.</p>
},
	keywords = {visualization},
	isbn = {0003-2700},
	doi = {Doi 10.1021/Ac2010108},
	url = {<Go to ISI>://WOS:000293252500029},
	author = {Teisseyre, T. Z. and Urban, J. and Halpern-Manners, N. W. and Chambers, S. D. and Bajaj, V. S. and Svec, F. and Pines, A.}
}
@article {302,
	title = {Multiphase imaging of gas flow in a nanoporous material using remote-detection NMR},
	journal = {Nature Materials},
	volume = {5},
	year = {2006},
	note = {Nat Mater029AOTimes Cited:25Cited References Count:40},
	month = {Apr},
	pages = {321-327},
	abstract = {<p>Pore structure and connectivity determine how microstructured materials perform in applications such as catalysis, fluid storage and transport, filtering or as reactors. We report a model study on silica aerogel using a time-of-flight magnetic resonance imaging technique to characterize the flow field and explain the effects of heterogeneities in the pore structure on gas flow and dispersion with Xe-129 as the gas-phase sensor. The observed chemical shift allows the separate visualization of unrestricted xenon and xenon confined in the pores of the aerogel. The asymmetrical nature of the dispersion pattern alludes to the existence of a stationary and a flow regime in the aerogel. An exchange time constant is determined to characterize the gas transfer between them. As a general methodology, this technique provides insights into the dynamics of flow in porous media where several phases or chemical species may be present.</p>
},
	keywords = {visualization},
	isbn = {1476-1122},
	doi = {Doi 10.1038/Nmat1598},
	url = {<Go to ISI>://WOS:000236530400024},
	author = {Harel, E. and Granwehr, J. and Seeley, J. A. and Pines, A.}
}
