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joshhan2000 · 20th December 2005, 07:27

We have all been hearing about IR detection of CO2. I can personal say I use the technique for many years in the lab. For the past 6 month I have be experimenting with the free radical separation of CO2. But there are limit to IR detection of CO2. One limit that has to be over come is at higher then one ATM gas is no longer following the ideal gas law. I know we have all read about PV=NRT but how many really under stand that this is called ideal gas law. It is name this because it is the way gas behaves in ideal condition. That means 1 ATM or lower and close to 20 deg C. After that we need to Van Der Waals equation which is:

This it the way you must look at gas in the non-ideal state. Now that you understand a little how gases work. I can come back to my point as the gases get more pressurized there are more electro static forces. Hydrogen bonding, Van Der Waals forces, London dispersion forces. These force make the CO2 behave differently then when under ideal condition. So not only do you have to deal with the Moisture content of the systems you also have to deal with Quantum Mechanics of the system. I am sure there has been a lot of very ingenious ways of dealing with the moisture content I would just like to know how they are planning to deal with a gas that is at 10 Atm. The follow are helpful web site.

http://www.licor.com/env/PDF_Files/co2_abs.pdf

http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Thermal/vdWaalEquatOfState.html

20th December 2005, 07:27	#1 (permalink)
joshhan2000 New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Dec 2005 Location: olympia wa usa Posts: 46	Ir detection limit We have all been hearing about IR detection of CO2. I can personal say I use the technique for many years in the lab. For the past 6 month I have be experimenting with the free radical separation of CO2. But there are limit to IR detection of CO2. One limit that has to be over come is at higher then one ATM gas is no longer following the ideal gas law. I know we have all read about PV=NRT but how many really under stand that this is called ideal gas law. It is name this because it is the way gas behaves in ideal condition. That means 1 ATM or lower and close to 20 deg C. After that we need to Van Der Waals equation which is: This it the way you must look at gas in the non-ideal state. Now that you understand a little how gases work. I can come back to my point as the gases get more pressurized there are more electro static forces. Hydrogen bonding, Van Der Waals forces, London dispersion forces. These force make the CO2 behave differently then when under ideal condition. So not only do you have to deal with the Moisture content of the systems you also have to deal with Quantum Mechanics of the system. I am sure there has been a lot of very ingenious ways of dealing with the moisture content I would just like to know how they are planning to deal with a gas that is at 10 Atm. The follow are helpful web site. http://www.licor.com/env/PDF_Files/co2_abs.pdf http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Thermal/vdWaalEquatOfState.html
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