X-Message-Number: 25519 From: "leo" <> Subject: Re: CryoNet #25498 NMR freeze Date: Tue, 11 Jan 2005 23:20:26 +0100 From Yvan Bozzonetti >Here you assume that nearly each hydrogen atom is polarized, the requested >magnetic field is near what can be found on a neutron star, 100 billions >time >what the best laboratory can do. MRI using hydrogen can polarize at best >one >atom out of one million. How that could have any effect on bulk freezing >properties of water ? Whater is not helium 3. >Water polarization : 0. 000 1 percent >helium or xenon polarization: up to 80 percent. >Your system is hopless, sorry. So far I now (I could be wrong) all hydrogen protons (not atoms) are aligned in a magnetic field, At 1 Tesla, for every 2 million protons, there are 6 more protons aligned with the field than there are aligned against the field, in your reasoning this 6 protons are polarized, this is not important for MRF freezing because the aligning of all the protons makes it possible to resonate them all with a CONTINUSLY RF Field (not a microsecond pulse of a MRI or NMR scan), I understand how stronger the field is how more protons aligned with the field, because this is not important for MRF freezing the magnetic field need not be that strong. If MRF freezing doesn't work its not for the reason you give Leo. Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=25519