Development of NMR Pulse Sequences...
Despite the previous efforts of our group in the area of pulse sequences design for studying polymer conformation/dynamics and quantum information, we are going to present here only the recent proposals associated with NMR time domain porous media applications.
Since we began to study the migration of fluid molecules in porous media, we decided to improve the pulse sequences involving T2-T2 Exchange resulting in a few proposals, as follows. The first step was modifying the T2-T2 Exchange method, using the first CPMG pulse sequence as a T2-Filter, drastically reducing the experiment time and getting the same information. We called this pulse sequence as T2-Filtered T2−T2 Exchange NMR or simply T2 F-TREx. In the same way, we used saturation-recovery as T1-filter to run T2-T2 Exchange experiments. Soon after, we demonstrated that, just by appropriate phase cycling, we could get, with the same T2 F-TREx experiment, simultaneously T2-T2 Exchange and T1-T2 correlation, under the same experiment time. Later on, we proposed a method to obtain T1 distributions without using Inverse Laplace transform. Nowadays, we are developing new pulse sequences for NMR experiments using conventional and single-sided magnets, including DNP based experiments. |