Devices and process for high-pressure magic angle spinning nuclear magnetic resonance
A high-pressure magic angle spinning (MAS) rotor is detailed that includes a high-pressure sample cell that maintains high pressures exceeding 150 bar. The sample cell design minimizes pressure losses due to penetration over an extended period of time.
1. A MAS rotor device, comprising:
a rotor sleeve comprising at least one bushing disposed at an end adjacent a threaded surface along the inner wall defining a high-pressure sample cell that spans the inner diameter of the rotor sleeve; and
a threaded sealing valve that secures to a valve adapter secured in one of the at least one bushings configured to seal a sample within the sample cell preventing sample release at high sample cell pressures at least above 1 bar.
2. The rotor device of claim 1 , wherein the rotor sleeve comprises dual sealing bushings disposed above and below the sample cell defining upper and lower boundaries thereof.
3. The rotor device of claim 1 , wherein the at least one sealing bushing is secured with a high-pressure adhesive to threads or grooves disposed along the inner wall above or below the sample cell within the rotor sleeve.
4. The rotor device of claim 1 , wherein the rotor sleeve does not include a sample cell insert.
5. The rotor device of claim 1 , wherein the rotor sleeve comprises a ceramic.
6. The rotor device of claim 1 , further comprising a drive tip disposed at an end of the rotor sleeve for rotation of said rotor.
7. The rotor device of claim 1 , wherein the threaded sealing valve prevents sample release from the sample cell at internal sample cell pressures greater than or equal to 1 bar.
8. The rotor device of claim 1 , wherein the threaded sealing valve cap prevents sample release from the sample cell at internal sample cell pressures between 1 bar and 70 bar.
9. The rotor device of claim 1 , wherein the threaded sealing valve cap prevents sample release from the sample cell at sample cell pressures greater than 70 bar.
10. The rotor device of claim 1 , wherein the threaded sealing valve cap prevents sample release from the sample cell at sample cell pressures greater than 150 bar.
11. The rotor device of claim 1 , further including an RF coil with RF shields disposed at respective ends of the rotor sleeve that delivers a localized B 1 field that minimizes background signals arising from the at least one sealing bushing within the rotor sleeve.
12. The rotor device of claim 1 , wherein the sealing cap defines a needle channel for introducing samples into the sample cell or retrieving samples therefrom.
13. A MAS rotor device for analysis of samples at high sample pressures, comprising:
a rotor sleeve defining a sample cell that spans the inner diameter of the rotor sleeve with at least one threaded bushing disposed at an end adjacent a threaded surface along the inner wall; and
a threaded sealing cap that secured in one of the at least one bushings seals the sample cell preventing sample release therefrom at sample cell pressures at least up to about 70 bar.
14. A MAS rotor device for analysis of samples at high sample pressures, comprising:
a rotor sleeve defining a sample cell that spans the inner diameter of the rotor sleeve with at least one threaded bushing disposed at an end adjacent a threaded surface along the inner wall; and
a threaded sealing cap comprising a driving tip head secured in one of the at least one bushings sealing a sample within the sample cell preventing sample release at internal sample cell pressures at least up to about 70 bar and providing rotation of said rotor from a single end thereof.
15. A method, comprising:
spinning a sample at the magic angle within a high-pressure sample cell defined within a ceramic rotor sleeve spanning the inner diameter therein that is sealed with a threaded sealing cap secured within the rotor sleeve above the sample cell therein to analyze the sample therein in situ at high sample cell pressures above 1 bar without release of sample therefrom.
16. The method of claim 15 , wherein the spinning step is performed at internal sample cell pressures above 1 bar to about 70 bar.
17. The method of claim 15 , wherein the spinning step is performed at internal sample cell pressures greater than 70 bar.
18. The method of claim 15 , wherein the spinning step is performed at internal sample cell pressures greater than 150 bar.
19. The method of claim 15 wherein the threaded sealing cap is secured within the rotor sleeve using at least one threaded bushing disposed above the sample cell therein.
20. The method of claim 15 wherein the threaded sealing cap includes a driving tip head and the spinning step includes rotating the rotor sleeve from a single end thereof using the driving tip head.
21. A MAS rotor device for sample analyses at high sample pressures in-situ, comprising:
a ceramic rotor sleeve defining a sample cell that spans the inner diameter therein and a threaded channel disposed above the sample cell; and
a threaded sealing cap that secured in the threaded channel within the rotor sleeve seals the sample cell providing sample containment without sample release at sample cell pressures at least up to about 70 bar.
22. The rotor device of claim 21 , wherein the sealing cap includes a driving tip head for rotation of said rotor from a single end thereof.