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Nuclear Magnetic Resonance Pam Mawson and Dani Dulin RET Program Summer 2003

Nuclear Magnetic Resonance Pam Mawson and Dani Dulin RET Program Summer 2003

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Nuclear Magnetic Resonance Pam Mawson and Dani Dulin RET Program Summer 2003

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  1. Nuclear Magnetic Resonance Pam Mawson and Dani Dulin RET Program Summer 2003

  2. What does NMR mean?Nuclear - Pertains to the nucleus of an atom, made up of protons and neutrons Magnetic - The magnetic moments in the nucleus are controlled with magnetic fieldsResonance – Resonance occurs when nuclear precession matches the applied oscillating field

  3. A Simple Way of Looking at NMR… "You know, what these people do is really very clever. They put little spies (nuclei) into the molecules and send radio signals (pulses) to them, and they have to radio back what they are seeing (signals).” Felix Bloch recalling Niels Bohr's description of Nuclear Magnetic Resonance.

  4. NMR System Components • H0 is the static magnetic field • Send RF signal to blue line • Generates oscillating field in the blue coil • Excites the nucleus in the sample tube • Nucleus sends its signal to the red coil • Spectrum produced by Fourier analysis

  5. Nuclear Magnetic Resonance occurs when the nuclei of certain atoms are immersed in a static magnetic field and exposed to a second oscillating magnetic field. • Some nuclei experience phenomenon, and others do not. It depends on whether they possess a property called spin. What is spin?

  6. Spin is a fundamental property of nature like electrical charge or mass. Before they realign they move around the field tracing the shape of a cone … this is called precession.

  7. Precession If the axis of a spinning top or gyroscope is not vertical, it wobbles around in a motion called precession. In order to get a signal, precession must occur.

  8. The condensed matter NMR group is currently analyzing pulse data on a cobalt aluminum (CoAl) layered sample.

  9. Our mentor, Dr. Kuhns, is collecting data on the magnetic properties of cobalt and its effects on aluminum. Dr. Kuhns records pulse sequence data from the cobalt/aluminum sample on the spectrometer into his log.

  10. Dr. Kuhns checks the helium supply This is the probe the CoAl sample is placed in

  11. Our Project: NMR Model • To improve on the design of an existing model to demonstrate magnetic resonance to the general public • Spinner (sintered magnet) on previous model lost mass from excessive centrifugal forces • Redesign the “spinner” for the Nuclear Magnetic Resonance macro model to withstand rotational force over longer periods of time

  12. The Model The center piece of the NMR model was built in 2001 by Linda Wolters and Alison Gerry. Last year’s participants built the G-10 frame around the magnet and created an electromagnetic field.

  13. New spinner Old spinner The new magnet will be encased by Garolite to prevent the magnet from chipping and losing mass.

  14. Total Moment of Inertia We calculated the inertia of the cylindrical magnet, sleeve, and G10 mass that was added to the spinner in order to duplicate the mechanical properties of the old spinner. I= 722.86 gmm2 I= 1/2 m2 r22+½rpl1(r42- r22) (r22+ r42) +1/2 rpl2 (r52- r42)(r42+ r52) Physics 101: Dani looks up formula for calculating the moment of inertia

  15. New Spinner Design A software program, Sketch, was used to draw the spinner with exact measurements and specifications for the machinist to build.

  16. Status of our project… Spinner is still with the machinist We are currently building a circuit to generate the oscillating field Once the spinner is completed, the model will be reassembled and used for further open house NMR demonstrations

  17. When hooked up to a power supply and an air supply, the model will behave much like a gyroscope.

  18. Why is NMR important? Nuclear magnetic resonance is a valuable tool for future applications. It is a piece of the puzzle for innovative technologies around the world. Pharmaceuticals Magnetic Resonance Imaging Transportation

  19. We hope to see the final product up and running by the end of our research experience. Science is a process based on continued improvements.

  20. Preparing Resonance Model for the Showcase Mr. Farrell Senior Engineering Technician and Designer Dr. Kuhns, Dr. Reyes, and Dr. Moulton

  21. A Special Thanks To… National Science Foundation National High Magnetic Field Laboratory Dr. Pat Dixon Ms. Gina LaFrazza-Hickey & the CIRL staff Our Mentors… Dr. Phil Kuhns Dr. Arneil Reyes The NMR Group and Mr. John Farrell