Bertram

Bertram works as Senior Applications Engineer for Magritek in Wellington. He gained his PhD under the supervision of Paul Callaghan and has been working in the field of NMR technology for over 20 years.

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Gradients in NMR Spectroscopy – Part 6: Mixture Analysis by Diffusion Ordered Spectroscopy (DOSY)

In part 5 we introduced the PGSE experiment to measure self-diffusion coefficients. We saw that if the peak integrals are displayed as a Stejskal-Tanner plot we can immediately identify if there is a single self-diffusion coefficient or not. This works pretty well for neat liquids, or solutions with a single type of molecule, or even …

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New Publications Page

Serving requests from our followers, we have created a list of selected peer-reviewed publications in which our Spinsolve benchtop NMR spectrometer is featured. Spinsolve is being used for research in topics such as online Reaction Monitoring, Hyperpolarisation, Ultrafast 2D NMR, Residual Dipolar Couplings and Process Control. Please have a look at Publications. This is a …

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Gradients in NMR Spectroscopy – Part 5: The Pulsed Gradient Spin Echo (PGSE) Experiment

Part 3 discussed how a matched pair of positive/negative magnetic field gradient pulses can be used to encode spins for their displacement. Although this simple sequence has great value from an educational point of view, it is rarely used in practice due to several drawbacks. The delay time between the two gradient pulses can be …

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Gradients in NMR Spectroscopy – Part 4: A short Intermezzo on Diffusion

Part 3 discussed how a matched pair of positive/negative magnetic field gradient pulses can be used to encode spins for their displacement. We can distinguish between two basic types of displacement: All spins are moving together with the same speed along the same direction. This leads to a phase shift in the signal. All spins …

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nmr-enr

Epoxydized Natural Rubber Measurement

When natural rubber (NR) latex is epoxydized, it is converted to a new plastic (Epoxydized Natural Rubber or ENR) with many favorable properties. Damping and anti-vibration characteristics are improved. ENR is oil resistant and has a better air impermeability i.e. better sealing properties. ENR or Epoxyprene is a speciality polymer produced from natural rubber latex, …

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Gradients in NMR Spectroscopy – Part 3: Encoding for Displacement using Pairs of Pulsed Gradients

Part 2 of this series discussed how pulsed magnetic field gradients (PFGs) can be used to encode spins for their position, whilst still having the advantage of uniform field during signal acquisition.In this post we will see how pairs of pulsed gradients can encode for molecular displacement. Consider the situation where we apply a second …

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Gradients in NMR Spectroscopy – Part 1: The Basics

For high resolution NMR spectroscopy we aim to get the magnetic field as uniform as possible across the measurement volume. This manifests itself in narrow peaks in the spectrum and better spectral resolution. However, there are situations where field variations over the measurement volume (called Magnetic Field Gradients or MFG) can be beneficial. This blog …

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Isomers

Isomers: More Student Teaching Lab Manuals

We have developed two documents which show how the Spinsolve benchtop NMR spectrometer can be used in Chemistry Education to introduce students to NMR. In these laboratories students measure the 1D proton NMR spectra of isomers of C4H8O2: ethyl acetate, butyric acid and isobutyric acid.