Cylindrical Demagnetization Fields and Microprobe Design in High-Resolution NMR

Barbara, Thomas M.

doi:10.1006/jmra.1994.1168

Cited by 99 publications

(39 citation statements)

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“…A cylindrical setup is chosen based on the fact that spherical entities and infinitely long cylinders that are exposed to a homogenous magnetic field also produce a homogenous magnetic field in their interior (15). The SCS approximates a cylinder of quasi infinite length.…”

Section: Susceptibility Matchingmentioning

confidence: 99%

Silicon cylinder spiral coil for nuclear magnetic resonance spectroscopy of nanoliter samples

Leidich

Braun

Geßner

et al. 2009

Concepts Magn Reson

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This contribution presents a new high sensitivity microdetector designed for high resolution proton NMR at 750 MHz (17.6 T) of sample volumes ranging from 5 to 40 nl. The desired volume of fluid is placed in a sealed 330/200 lm outer/inner diameter glass capillary and is then situated in the center of the detection coil. The high quality factor detection coils are fabricated using silicon microtechnology. The materials from which the device is constructed are specially shaped to improve the homogeneity of the static magnetic field within the sample. Adverse effects of the finite, nonspherical sample geometry on the spectral resolution are mitigated by employing sample rotation up to 2.5 kHz at the magic angle. The new detector exhibits linewidths of smaller than 3.0 Hz (0.004 ppm) and a signal-to-noise ratio in the spectral domain of higher than 4,000 per lmol of water. Results with respect to sensitivity, spectral resolution, and total sample volume are given and put into context with already published microprobes.

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Section: Susceptibility Matchingmentioning

confidence: 99%

Silicon cylinder spiral coil for nuclear magnetic resonance spectroscopy of nanoliter samples

Leidich

Braun

Geßner

et al. 2009

Concepts Magn Reson

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show abstract

“…Conversely, a sample free of bubbles will only produce susceptibility broadening at the boundaries of the sample with the tube that contains it and the air that surrounds the tube. Forcing the cubic phase to assume the shape of a long (nearly infinitely long) cylindrical tube will therefore eliminate the ''end effects'' and produce a uniform demagnetization field [17,18]. Here, we show that high resolution 1 H NMR spectra with resolved J-coupling multiplets can be obtained using a conventional liquid state NMR probe, without HR-MAS, by loading uniform and homogenous samples of the high viscosity cubic phase into thin-walled glass capillaries.…”

Section: Introductionmentioning

confidence: 96%

High resolution 1H NMR of a lipid cubic phase using a solution NMR probe

Boyle-Roden

Hoefer

Dey

et al. 2007

Journal of Magnetic Resonance

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“…To obtain the accurate orientation-dependent 15 N TROSY shifts, Dd TROSY , we recorded a set of 1 H-15 N TROSY spectra measured with and without magic angle sample spinning (MAS) on a 500 MHz NMR spectrometer equipped with a NanoProbe (Varian) [21,25,26]. The application of the MAS to an ordered bicelle medium eliminates the torque that aligns the bicelles against the magnetic field [26].…”

Section: Resultsmentioning

confidence: 99%