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DY: Fachverband Dynamik und Statistische Physik

DY 39: Wetting, Microfluidics and Confined Liquids I (joint session CPP/DY)

DY 39.8: Vortrag

Mittwoch, 14. März 2018, 11:45–12:00, C 264

Spatially Resolved NMR with Micrometer Resolution in Static Field Gradients — •Benjamin Kresse, Mark Höfler, Alexei F. Privalov, and Michael Vogel — TU Darmstadt, Hochschulstr. 6, 64289 Darmstadt, Germany

A new probe head is presented which is specially designed for magnetic resonance imaging (MRI) with ultrahigh resolution in one dimension using a static field gradient magnet. In contrast to clinical MRI scanners with a spatial resolution of typically 0.1 to 1 mm a resolution of about 2 µm is reached due to the high field gradient of 73 T/m. Systems with a rotational symmetry can be investigated by scanning the sample slice-wise. The key feature of the probe is a precise computer controlled adjustment of the sample position and orientation e.g. to adjust the sample axis parallel to the gradient of the magnetic field.

Wetting processes can be investigated. For example, droplets on surfaces can be studied in terms of density by inspecting the signal amplitude and in terms of molecular dynamics by measuring the relaxation time of the nuclear spins. Furthermore, concentration gradients of mixtures can be examined by measurements on different isotopes. It is also possible to investigate biological objects with flat geometries like skin. In principle non-stationary processes like in microfluidics can be explored with an increased time resolution by a boosted signal-to-noise ratio using stripline designs.