Spin-Lattice Relaxation Dispersion in Pores

The total proton frequency range that can be probed by NMR spin-lattice relaxation techniques is 10 Hz v lO Hz. For the present application, deuteron resonance selectively applied to perdeuterated polymers confined to the pores is superior to proton resonance which, unlike the situation in field-gradient experiments, is affected by signals from the matrix and flip-flop spin diffusion across the matrix. The deuteron fi equency range is shifted by a factor of 0.15 to lower frequencies. This frequency window largely matches the time scale of chain modes of polymers with medium molecular masses. 

The exceptional frequency and molecular weight dependence for the spin-lattice relaxation time expected for limit (II)de  

The experimental deuteron frequency range in which this frequency dependence was observed is 5x10 Hz v 6x10 Hz. De Gennes prediction for limit (II)de has thus been verified for polymers confined in artificial 

---