NMR Relaxation Spectrometer

[DrBeauWebber]

Hi Guys,
Relaxation NMR is an extremely useful quantitative technique for both Material Science and studying nano-structured materials.

I have spent the last 2 1/2 years creating my Mk3 NMR Relaxation Spectrometer, based on Pavel Demin's pulsed NMR firmware in a Red Pitaya.
I hope many may find useful. It is now certificated and ready for ordering.

The Lab-Tools Mk3 NMR Relaxation Spectrometer is built around a credit-card sized Field Programmable Gate Array module for the digital RF, with attached custom surface mount low-noise receiver and linear transmitter.  The extreme compactness and lightness of this precision research grade NMR relaxation spectrometer make it ideal for use in the field. The prototype has just been certified to international standards  BS EN 61 326-1: 2013 & IEC 61326-1:2012.
 
Far more than just another liquids spectrometer, this device is targeted at samples that may be liquid, waxy, porous, polymer, tar …. , and is quite capable of measuring T2s in brittle ice, for example.
There are many applications in Material Science where measurements of mobility / stiffness / viscosity / rigidity are very useful parameters, providing data on the physical state of the sample.
 
Please see the following two links regarding the NMR Relaxation Spectrometer and a few example test measurements that have been made using it, and also two published papers :
 
http://www.lab-tools.com/instrumentatio ... rument.pdf
  http://www.lab-tools.com/instrumentatio ... ements.pdf

References :
1. Credit-card sized Field and Benchtop NMR Relaxometers using Field Programmable Gate Arrays. J. Beau W. Webber, Pavel Demin, Magnetic Resonance Imaging Volume 56, February 2019, Pages 45-51, DOI: 10.1016/j.mri.2018.09.018  https://doi.org/10.1016/j.mri.2018.09.018
2. Biological, Medical and Nano Structured materials - NMR done Simply. J Beau W Webber. Archives in Biomedical Engineering & Biotechnology 1(4): 2019. ABEB.MS.ID.000517
https://irispublishers.com/abeb/pdf/ABE ... 000517.pdf

My next task it to turn it into an NMR Cryoporometer, for measuring sub-nanometer to micron sized pores.
3. Nuclear Magnetic Resonance Cryoporometry J. Mitchell, J. Beau W. Webber and J.H. Strange. Physics Reports, 461, 1-36, 2008. DOI: 10.1016/j.physrep.2008.02.001 http://dx.doi.org/doi:10.1016/j.physrep.2008.02.001

Cheers,
Dr. Beau Webber
www.Lab-Tools.com/instrumentation/

[DrBeauWebber]

This is the NMR relaxation spectrometer with Red Pitaya, probe, magnet and all-in-one HP i5 computer :

[DrBeauWebber]

Well I said my next task was to extend this NMR time-domain relaxation spectrometer so that it could act as an NMR Cryoporometer for measuring nano-pore size distributions :

I have implemented a Peltier thermo-electrically cooled NMR variable temperature probe, to enable this :


Here is a measured melting curve using ice/water in the pores of a nominally 100A pore -size sol-gel silica :

ws0100m_08w melting curve.png

and here it is transformed into a pore-size distribution :


The signal-to-noise is exceptionally good, I am pleased to say.

[redpitaya]

Black Friday 2020 is here!

[DrBeauWebber]

Hi Guys,
there is an updated web page for the Lab-Tools Red Pitaya based NMR time-domain spectrometer:
https://nmrspectrometer.lab-tools.com/
Please do check it out - is amazing what one can do with these Red Pitaya devices.
Cheers, Beau Webber

[redpitaya]

This project was also recently featured on our blog:
https://content.redpitaya.com/blog/nmr- ... instrument