School of Chemical and Physical Sciences

Facilities

Tuning the NMR

Tuning the NMR magnet

The laboratory has a range of NMR spectrometers, from high-field superconducting magnets to an Earth's-field system. We also have access to excellent rheometers as well as dynamic light scattering facilities.


NMR

Bruker Avance 400 Systems

We have two Bruker Instruments AVANCE400 – wide bore (1H frequency 400 MHz) systems. Both have 9.4 T superconducting 89 mm vertical bore magnets and are controlled by a PC, presently running state of the art ParaVision and TopSpin software. The spectrometer is also equipped with a complete Bruker micro-imaging accessory and a Diff60 probe.

The consoles are equipped with two rf channels, both capable of generating hard and shaped pulses for any nucleus. The micro-imaging accessories of the systems are powered by Bruker GREAT-60 gradient power supplies.

The principal use for this instrument is high-resolution spectroscopy, micro-imaging, Rheo-NMR and PGSE studies, therefore the micro-imaging probes are most regularly used. These micro-imaging probes have rf coils for 1H and 2H imaging/spectroscopy ranging from 5mm to 25mm in diameter and are used in combination with the Bruker gradient coils.

The Micro 2.5 (meaning 2.5 G/cm/A) probes give a maximum gradient of 15 G/mm at 60A. In addition, these probes also have a tuneable x-nucleus channel, and probes are designed and built in-house for 31P and 23Na imaging. Both AVANCE400 systems share a range of probes, in addition to the imaging probes. There is a 5 mm high-resolution solution probe with 1H and 13C channels, as well as 2H lock and a Bruker Diff60 high-gradient diffusion probe, which gives a maximum gradient of 360 G/mm.

All probes can be connected to the AVANCE computer-controlled variable temperature apparatus, which with the use of a liquid nitrogen reservoir can cover temperatures from -10 to 150 deg C.


RheoNMR

Both Bruker AVANCE 400 MHz systems are equipped with the full range of Rheo-NMR accessories, including geometries, drive shaft, a motor with a range of interchangeable gear-boxes and power supply.

Read more about Rheo-NMR and the current research in this area.