Stock material or miscellaneous articles – Hollow or container type article – Glass – ceramic – or sintered – fused – fired – or calcined metal...
Patent
1995-06-07
1997-03-18
Lusignan, Michael
Stock material or miscellaneous articles
Hollow or container type article
Glass, ceramic, or sintered, fused, fired, or calcined metal...
427294, 428429, 528 31, A47G 1922
Patent
active
056121032
ABSTRACT:
The invention provides a method of inhibiting surface-induced nuclear spin relaxation and surface trapping of a hyperpolarized noble gas, most preferably .sup.129 Xe, by polymer-coated surfaces. The method includes inhibiting the amount of interaction of the noble gas with a polymeric coating on the surface of apparatus which contacts the noble gas. Preferably, the method includes inhibiting noble gas nuclear spin relaxation by replacing at least some of the protons in the polymer with substituents which have non-zero nuclear spin and/or reduced polymer permeability. A preferred substituent having non-zero spin is deuterium. A preferred modification which reduces permeability includes introducing into the polymer a substituent such as a halogen, more preferably fluorine. The method also provides containers having surfaces which have been coated with a polymer which inhibits noble gas trapping and nuclear spin relaxation. Furthermore, the invention provides methods for enhancing the production and storage of a hyperpolarized noble gas by decreasing the relaxation of nuclear spin and limiting the trapping of the noble gas in a polymeric coating of apparatus containing the noble gas.
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Cates, Jr. Gordon D.
Driehuys Bastiaan
Happer William
Lusignan Michael
Princeton University
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