PPM Fluid - what's best?

[ToyMaker]

Have done some reading about ppm fluids. Seems most use
water or an alcohol (ethanol, methanol).
If I understand (please correct me as needed ) the ppm
detects the protons in hydrogen as they spin out of
alignment.
So it seems that if the fluid has relatively more H it will
generate a stronger signal. With this in mind, I spent a few
minutes with wikipedia and a spreadsheet (OpenOfficeCalc)
and found the following:

Substance      Formula       Density          %H
Water        H2O               1.00          100.0
Propane      C3H8              0.58           95.4
Butane       C4H10             0.60           92.9
Methanol     CH4O              0.79           88.4
Ethanol      C2H6O             0.79           92.2
Paraffin     C25H52            0.93          123.6

Six "fluids" are listed with their formulas, densities, and % of
H relative to water. I used molecular weights and grams/mol
to derive the result.
So, given the potential for a 20% gain in signal strength,
has anyone used paraffin (wax) as a working fluid? If not,
why? It seems that because it is "solid" at room temps
it would be quite easy to work with.

regards,

thom

[msolc]

It MUST be liquid

to work...

[ToyMaker]

Aha... thank you. I knew there must be a reason.
I'll keep reading and learning.

regards,

thom

[Seden]

PPM Fluid-what's best?

Not a problem-liquid paraffin is also known as Mineral Oil.

From Wikipedia:

Mineral oil

Main article: Mineral oil
Liquid paraffin, or mineral oil, is a mixture of heavier alkanes, and has a number of names, including nujol, adepsine oil, alboline, glymol, medicinal paraffin, or saxol. It has a density of around 0.8 g/cm3.


Randy

[Tinkerer]

Some proton magnetometers used Kerosene. I believe it gives a faster proton alignment.

Liquid paraffin may be similar.

Tinkerer

[Seden]

Pure Liqued paraffin wax

Here is true liquid 100% paraffin wax:

http://www.instawares.com/soft-light-disposable-liquid.977076.0.7.htm?gclid=CPLD6fnOqKMCFQUbawodRC sH4A&s_kwcid=TC|20025|liquid paraffin wax||S|p|5839841289&

Used for candles. Paraffin is what Purcell,Pound and Torrey used in their discovery of nuclear magnetic resonance,for which they won the Nobel Prize (from pg.12 of the book "Signals from the Subatomic World" by Stefan Hollos and Richard Hollos-200.

Randy

[Seden]

Tried editing 3 times

Should read 2008 for the copyright. Tried saving my corrections three times and goes back to the happy face,oh well.

Randy

[Qiaozhi]

Should read 2008 for the copyright. Tried saving my corrections three times and goes back to the happy face,oh well.

Randy

This happens when you type an "8" followed by ")". For example: (200
The solution is to type ( 2008 ).

[Willy Bayot]

Some proton magnetometers used Kerosene. I believe it gives a faster proton alignment.

Liquid paraffin may be similar.

Tinkerer

We are using isopropyl alcohol (isopropylene). This is the alcohol used to clean the white boards and the TV and PC Screens. It is widely available and cheap. We get very good signals from a polarization duration as small as 600msec which gives us a practical reading rate of one per second.
I have also used the type of alcohol used to light the BBQ,thaty works almost as well. The problem with kerosene is that it is a mixture of undefined percentages of many simple components and that could give very different results from one sample to the other. It also smells very bad!!!
Willy

[bmoore]

PPM fluid additives?

Have done some reading about ppm fluids. Seems most use
water or an alcohol (ethanol, methanol).
If I understand (please correct me as needed ) the ppm
detects the protons in hydrogen as they spin out of
alignment.
So it seems that if the fluid has relatively more H it will
generate a stronger signal. With this in mind, I spent a few
minutes with wikipedia and a spreadsheet (OpenOfficeCalc)
and found the following:

Substance      Formula       Density          %H
Water        H2O               1.00          100.0
Propane      C3H8              0.58           95.4
Butane       C4H10             0.60           92.9
Methanol     CH4O              0.79           88.4
Ethanol      C2H6O             0.79           92.2
Paraffin     C25H52            0.93          123.6

Six "fluids" are listed with their formulas, densities, and % of
H relative to water. I used molecular weights and grams/mol
to derive the result.
So, given the potential for a 20% gain in signal strength,
has anyone used paraffin (wax) as a working fluid? If not,
why? It seems that because it is "solid" at room temps
it would be quite easy to work with.

regards,

thom

I've read that the commercial manufactures have proprietary additives to make
the fluids work better. One idea is to use distilled water and add an 'ion' additive.
This I surmise helps couple the first RF pulse to the fluid which can then couple this energy to the magnetic domain for subsequent steps. I think this might be an
acid of some kind.

[Boattow]

This I surmise helps couple the first RF pulse to the fluid which can then couple this energy to the magnetic domain for subsequent steps.

Are we still talking about proton precession mags???

[Willy Bayot]

Are we still talking about proton precession mags???

No, this is the principle used in Overhauser systems but it also needs an RF excitation coil.

Willy

[sevzirfo]

We are using isopropyl alcohol (isopropylene). This is the alcohol used to clean the white boards and the TV and PC Screens. It is widely available and cheap. We get very good signals from a polarization duration as small as 600msec which gives us a practical reading rate of one per second.
I have also used the type of alcohol used to light the BBQ,thaty works almost as well. The problem with kerosene is that it is a mixture of undefined percentages of many simple components and that could give very different results from one sample to the other. It also smells very bad!!!
Willy

Today, I first tested isopropyl alcohol (isopropylene) in the proton magnetometer PPMA-3. Large improvements in the device compared to kerosene had not noticed. The device works fine when the polarization of 600 ms. Boundary of stable operation - 400 ms