Low temperature susceptibility compensation

• US 7,476,330 B2
• Filed: 09/24/2003
• Issued: 01/13/2009
• Est. Priority Date: 09/24/2003
• Status: Expired due to Fees

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Varian Incorporated (Agilent Technologies, Inc.)
• Inventors: de Swiet, Thomas, Barbara, Thomas M.
• Primary Examiner(s): Hendrickson; Stuart
• Assistant Examiner(s): VIJAYAKUMAR, KALLAMBELLA M
• Application Number:
  US10/669,772
• Publication Number:
  US 20050062022A1
• Time in Patent Office: 1,938 Days
• Field of Search: 252/62.51 R, 252/62.54, 252/62.57, 252/301.18, 252/478, 252/500, 252/511, 252/518.1, 424/1.65, 424 93- 94, 600/410, 324/307, 376/272, 372/52
• US Class Current: 252/62.51R
• CPC Class Codes: G01R 33/387 Compensation of inhomogeneities
• CPC Class Codes: H01F 1/0018 Diamagnetic or paramagnetic materials, i.e. materials with low susceptibility and no hysteresis H01F1/0036 takes precedence
• CPC Class Codes: H01F 1/42 of organic or organo-metallic materials , e.g. grapheneH01F1/44 takes precedence

Abstract

An composition exhibiting a desired value of magnetic susceptibility, which can be used to fabricate components in an NMR device, and method thereof, wherein the composition comprises a metal ion selected from the group consisting of Gd⁺³, Fe⁺³ and Mn⁺² and an amorphous material using a ligand or chelating agent to solubilize the metal ion throughout the marphous material, wherein the magnetic susceptibility of the composition exhibits a desired value at cryogenic temperatures such as nearly zero susceptibility at temperatures at or below 77° K.

Claims

1. In a magnetic resonance apparatus for study of a sample, said apparatus comprising the environment surrounding said sample wherein said environment is characterized by a first value of magnetic susceptibility, an amorphous composition comprising an amorphous matrix, a metal ion selected from the group consisting of Gd^{3 +}, Fe⁺³ and Mn⁺², and a ligand, said composition having a value of magnetic susceptibility substantially equal to said first value at cryogenic temperatures.

2. The magnetic resonance apparatus of claim 1, wherein said ligand binds said metal ion and effects solubility thereof in said amorphous matrix.

3. The magnetic resonance apparatus of claim 2, wherein said metal ion is Gd³⁺ and is in the form of Gd(Lg)₃ or, in the alternative, in the form of Gd(ACAc)_3′

wherein Ac is acetylacetonate, and Lg is 2,2,6,6-tetraniethyl-3, 5-heptanedionate.

4. The magnetic resonance apparatus of claim 1, wherein said amorphous matrix comprises epoxy resin.

5. The magnetic resonance apparatus of claim 1, wherein said composition is characterized by said value of induced magnetization equal to that of another selected material at said cryogenic temperatures for exposure of both said materials to said applied magnetic field.

6. The magnetic resonance apparatus of claim 1, wherein said value of magnetic susceptibility is zero.

7. The magnetic resonance apparatus of claim 1, wherein said selected value of magnetic susceptibility is reached at a selected temperature below substantially 77K.

8. The magnetic resonance apparatus of claim 1, wherein said metal ion is Gd⁺³.