¹H NMR Relaxation Time, T₂, Distribution of HP Am/Cr(III) Acetate Gels in Glass Beads

Abstract

¹H nuclear magnetic resonance (¹H NMR) was used to monitor changes in the transverse relaxation time (T ₂) of solutions formulated at 40°C with partly hydrolyzed polyacrylamide (HPAm) and Cr(III) acetate 50% active in bulk and in the presence of glass beads. ¹H NMR detected changes in T ₂ that may be related to the distribution and changes in the gel's H species mobility within the porous medium.

Keywords:

• ¹H NMR
• HPAm
• Cr(III) acetate
• Polymer gels
• T ₂ distribution
• Porous media

The authors thank the UNB MRI Centre (supported by the MFA award) for allowing us to use the mq10 NMR analyzer and for the technical support. The authors thank Mr. Robert Sydansk, from Sydansk Consulting Services, for his comments. The authors are grateful to NSERC for the Discovery Grant to support this project.

Notes

A, no detectable gel formed; B, highly flowing gel; C, flowing gel; D, moderately flowing gel; E, barely flowing gel; F, highly deformable non-flowing gel; G, moderately deformable non-flowing gel.