NMR and The Designing and Manufacturing of an NMR Probe for 109Ag in LixAg3V4O11 Cathode Material, for 0.72<x =5.59. - PowerPoint PPT Presentation

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NMR and The Designing and Manufacturing of an NMR Probe for 109Ag in LixAg3V4O11 Cathode Material, for 0.72<x =5.59.

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Title: NMR and The Designing and Manufacturing of an NMR Probe for 109Ag in LixAg3V4O11 Cathode Material, for 0.72<x =5.59.


1
NMR and The Designing and Manufacturing of an
NMR Probe for 109Ag in LixAg3V4O11 Cathode
Material, for 0.72ltx 5.59.
  • By John Sangobowale
  • NASA SHARP
  • Mentors Dr. Phillip Stallworth, Steve G.
    Greenbaum, Ph.D
  • Physics department, Hunter College, Solid state
    NMR/EPR Lab

2
Purpose
  • Understand the basics of NMR
  • Apply my understandings of NMR into the
    construction of an NMR probe
  • Use the constructed NMR probe to run samples with
    LixAg3V4O11

3
NMR Spectroscopy
  • What is NMR?
  • Nuclear magnetic resonance
  • A phenomenon in which certain nuclei of atoms are
    immersed in a static magnetic field and are
    exposed to a second oscillating magnetic field.
  • Not all nuclei experience this phenomenon
  • Not all nuclei posses the property called spin
  • What is Spectroscopy?
  • Interaction of EM radiation with matter
  • What is NMR Spectroscopy?
  • Use of NMR phenomenon to study
  • Physical
  • Chemical
  • Biological

4
Spin Physics
  • Spin
  • Fundamental property of nature
  • Multiples of ½, can be or
  • Subatomic particles posses spin
  • Individual unpaired subatomic particle posses a
    spin of ½
  • Thought of as a small magnetic field
  • Examples
  • 2H 1,1,1, ½ electronic spin, 1 nuclear spin
  • 4He 2,2,2, NO SPIN

5
Spin Physics Continued
  • Properties of spin.
  • Net spin V.S. Magnetic field strength
  • ? ?ß
  • (Frequency) (gyromagnetic ratio)
    (magnetic field strength)
  • Energy levels
  • Low (N-S N-S)
  • High (N-N S-S)

6
Spin Physics Continued
  • Transitions
  • Low to High
  • High to Low
  • E h ?
  • (Energy) (Planks constant) (Resonance frequency
    AKA Lamor frequency)

7
Spin Physics Continued
  • Energy Level Diagram
  • ? ? ß
  • E h ?
  • Energy of a PhotonE h ? B

8
T1 Process
  • T1 process
  • At equilibrium, the net magnetization vector lies
    along the direction of the applied magnetic field
    B0.
  • Equilibrium Magnetization M0
  • MzM0

9
T1 Process continued
  • Exciting the system
  • Saturating the spin system
  • Mz0(90o)
  • Spin Lattice relaxation time (T1)
  • The equation governing this behavior as a
    function of time t, after its displament is
  • Mz Mo ( 1 - e-t/T1
    )

10
Precession
  • Precession
  • Net magnetization in the XY plane

11
T2 Process
  • T2 process
  • Dephasing due to spin packets
  • Spin Spin relaxation time, T2
  • MXY MXYo e-t/T2
  • T2lt T1
  • T1 and T2 occur simultaneously

12
NMR
  • Solid and Liquid NMR

High Pressure NMR
13
The Probe and its Applications
  • Complex piece of apparatus which has several
    functions
  • It locates the sample in the region of homogenous
    magnetic field.
  • It includes radiofrequency electronic circuits
    for irradiating the sample with radiofrequency
    waves, and for dectecting the subsequent
    radiofrequency emissions from the sample.
  • In some cases, the probe has a device for
    rotating the sample, in order to reduce the width
    of the NMR peaks.
  • In some cases, the probe has a devices for
    stabilization of the temperature of the sample.
  • In some cases, the probe contains additional
    coils for creating magnetic fields with a
    controlled spatial inhomogeneity-these coils are
    used in NMR imaging experiments, and many other
    techniques.

14
The probes electronics
15
The Probes
Solid/liquid NMR probe set up for diffusion
Solid NMR probe set up for High pressure
experimentation
16
MY Probes Accessories
The Probes body
The Probes electronics
17
My finished Probe
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