tag:blogger.com,1999:blog-3300702123878659843.post1007674009038274304..comments2024-03-26T05:25:50.831-04:00Comments on University of Ottawa NMR Facility Blog: Faster Relaxation Time Measurements in SolidsGlenn Faceyhttp://www.blogger.com/profile/05146575170575279335noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-3300702123878659843.post-27799040348075658762016-07-19T12:43:15.654-04:002016-07-19T12:43:15.654-04:00Isabelle,
I would keep it simple and use a standar...Isabelle,<br />I would keep it simple and use a standard inversion recovery. It will likely be a very time consuming experiment as the T1 may be quite long and you will not have the sensitivity advantage of cross polarization.<br />GlennGlenn Faceyhttps://www.blogger.com/profile/05146575170575279335noreply@blogger.comtag:blogger.com,1999:blog-3300702123878659843.post-15081238631091883492016-07-19T11:32:59.262-04:002016-07-19T11:32:59.262-04:00hi Glenn,
I want to measure the T1 of some compone...hi Glenn,<br />I want to measure the T1 of some components containing no H to cross polarize such as CaCO3. What is the best way to have the more accurate measurement? inverse recovery or saturation recovery?<br /><br />isabelleAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-3300702123878659843.post-69794716357604563112015-06-04T08:21:35.445-04:002015-06-04T08:21:35.445-04:00Hi Mark,
Thank you for the question. The relaxat...Hi Mark,<br /><br />Thank you for the question. The relaxation measurement described in this post is based on cross polarization. The recycle delay used depends on the proton rather than the 13C T1. A recycle delay of 5 times the proton T1 would be a good choice.<br /><br />Glenn Glenn Faceyhttps://www.blogger.com/profile/05146575170575279335noreply@blogger.comtag:blogger.com,1999:blog-3300702123878659843.post-92130322237665953202015-06-04T05:42:56.609-04:002015-06-04T05:42:56.609-04:00Hello Glenn,
Thanks for your very useful informati...Hello Glenn,<br />Thanks for your very useful information. I'll betray my knowledge base by asking whether 5 x T1 for the 1H protons is the necessary relaxation delay for a successful Torchia expt.to determine 13C T1's?<br />Thanks,<br />MarkMark Allennoreply@blogger.comtag:blogger.com,1999:blog-3300702123878659843.post-75242922270455360542010-06-14T10:14:59.890-04:002010-06-14T10:14:59.890-04:00nitin lobo,
Thank you for your excellent questio...nitin lobo,<br /><br />Thank you for your excellent question.<br /><br />One could measure the 13C T1 with a simple inversion recovery technique and one would observe the behavior you describe.<br /><br />The measurement here uses cross polarization to boost sensitivity and to allow the measurements to be repeated based on the 1H T1 rather than the much longer 13C T1. The measurement takes into account that the enhanced magnetization (from CP) relaxes back to the equilibrium value (without CP). <br /><br />GlennGlenn Faceyhttps://www.blogger.com/profile/05146575170575279335noreply@blogger.comtag:blogger.com,1999:blog-3300702123878659843.post-83364925926424193922010-06-14T06:33:39.427-04:002010-06-14T06:33:39.427-04:00Hi Glenn, Thanks for this wonderful post. I have o...Hi Glenn, Thanks for this wonderful post. I have one doubt. Why in SSNMR 13C T1 measurement profile not showing zero-crossing(it begins from -ve or +ve Max. value to zero) unlike in inversion recovery?nitin lobonoreply@blogger.com