There are so many discussions about the toxicity of CO2 that people are forgetting the actual application of CO2 as a solvent. After it is used and the temperature and pressure return to normal the CO2 reverts to a gaseous state and leaves the material. That is why it would be totally non-toxic for use in the production of medicine for example.
i mean in the video you can see how the supercritical fluid liquidizes again at the bottom of the container, which one could expect in a gravitational environment. i would be interested, whether it will form one big sphere or many tiny ones, or just randomly/chaotically condensate in a 0g environment...I am not quite sure if you understand what i mean..
Well, supposedly, the process of separation would instead show the liquid material not actually falling, but rather gathering from individual particles, into droplets, into tiny balls, and then, in a perfect environment, a single unified sphere of the liquid surrounded by the gas.
I know some people might be concerned because CO2 is a greenhouse gas, and I'd like to put those concerns to rest. There is no shortage of CO2 for experimentation. There is an abundance of CO2 from other chemical processes. This is a chemical compound that was going to go into the atmosphere anyway, but was captured on a brief layaway to accomplish some other tasks first. Whereas many of the organic solvents that are toxic and used in chemistry are deliberately manufactured. So if no one used CO2 for this purpose, we'd be making more of these toxic compounds, and at the end of the day, there would still be the same amount of CO2 being released into the atmosphere. Imagine finding a way to use toxic waste for a while before dumping it into the ocean, rather than dumping all of that toxic waste into the ocean directly AND also making some other more specific toxic waste for some other brief purpose. That would be bad. It's not a perfect analogy. Unlike toxic waste, CO2 is a necessary part of the ecosystem. But there's a balance we should be aware of, or nature herself will simply shrug humanity off to make room for some other organism to take over..
Science aside, that's the coolest interview/recruitment strategy I've heard in a long time. Why would you want someone who appears to have no real interest or passion for the subject and the job?
This is actually a good representation of the ocean of chaos in the mythic traditions of most world cultures: There was first the Chaos of the Void and it was later seperated in two, to form the tranquility of the Seas and peace of the Sky
This is an absolutely fascinating effect. It would be even more interesting if we tried this as a plasma in this kind of environment, it's stuff like this that makes me want to be a chemist O_o
@danx033 Supercritical fluids are basically one state f matter that doesn't know what to be because it's under alot of pressure so the molecules can spread out
P.403323 - The way of the pyrolysis 27.03.2013 P.403744 - Disposal Mobile mixtures, suspensions and solutions in the states of: sub-, and supercritical 29/04/2013 P.403784 - Mobile as periodic disposal of mixtures, suspensions and solutions, especially in the states of: sub-, sub-and supercritical 05/06/2013 P.403785 - Dosage and bleed flow, the pressure reactors 06/05/2013 I expect to have two numbers of applications.
b) pyrolysis or combustion of hydrogen with oxygen plasma stream with an aqueous suspension of power supply 2) technologies, over-, sub and sub-critical - four patents: a) rendering supercritical reactor pipe-Field-flow-modified type II - mobile technology for continuous operation b) treatment of a supercritical reactor flow tube combined targeted - mobile technology for continuous operation
Dear Sir, Would you be interested in investing in the sector of medical waste and other waste? I own several patents in the recycling industry and looking for a partner-investor: 1) two technologies pyrolysis, plasma incinerators - the perfect solution for recycling plastic waste, medical waste and wet waste with a very high degree of granularity - mobile technologies: a) pyrolysis or combustion of hydrogen with oxygen plasma jet of water supply
Actually CO2 is slightly poisonous and its toxicity depends on concentration regardless of amount of oxygen. Although CO2 is more dangerous as asphyxiant gas (displacing oxygen in environment). Concentration of CO2 above 4% even with normal oxygen concentrations can trigger hypercapnia or effects of CO2 poisoning.
These patent applications: P.403320 - The method of disposal of mixtures and suspensions of the hydrated 27.03.2013 P.403322 - Disposal of mixtures, suspensions and solutions in the states of: sub-, and supercritical 27.03.2013
c) treatment of a supercritical reactor tube without flow - to work periodical - the disposal of the body (cremation supercritical water), disposal of medical waste. d) a dosing and bleed into the reactors.
Carbon dioxide is not considered toxic but at high enough concentrations it can displace enough oxygen in the air where you would simply suffocate. Carbon monoxide however is toxic.
There are so many discussions about the toxicity of CO2 that people are forgetting the actual application of CO2 as a solvent. After it is used and the temperature and pressure return to normal the CO2 reverts to a gaseous state and leaves the material. That is why it would be totally non-toxic for use in the production of medicine for example. copy pasted for reference
very cool. but pretend u could put a person inside a tub like that or a frog or watever, what would happen ?? would they be able to like swim thru the gas??
@starked1 Oh, and the Apollo Lunar Module stored supercritical helium in its descent stage to pressurize its propellants. In the Service Module the supercritical O2 and H2 could become non-uniform or "stratified" in zero gravity so fans were added to stir them occasionally for more accurate quantity readings. On one flight, damaged electrical insulation on the fan in one O2 tank caught fire, resulting in the Apollo 13 emergency.
@DubIDubblix You said - "The surface tension disappears. I have no degree and was able to grasp it." - I just skimmed through the wiki on surface tension and am most impressed that you understand this area given the molecular and mathematical complexity of surface tension. It does not answer how when surface tension disappears that a liquid will flow up vertically though.I don't think you understand the slightest thing about this area which is why you have fobbed me off with visiting the wiki
13 лет назад
@ericon52168 I should probably say something like "I don't know... What _do you_ think?" ;)) But I won't. Think that supercritical carbon dioxide fluid would be used in fabrication of some prosthetic. As a simple solvent, as the professor explained. That carbon dioxide would either be removed completely before implantation or it will be discarded into the patient's organism. Now, please read the wiki article Carbon_dioxide#Toxicity Cheers! :)
@DevilMaster Actually @ 1% people will start feeling drowsy Staying @ 2% for several hours causes acidosis @ 3% breathing rate is 2X @ 5% breathing rate is 4X normal and the concentration becomes directly toxic Symptoms of high or prolonged exposure to carbon dioxide include headache, increased heart rate, dizziness, fatigue, rapid breathing, visual and hearing dysfunctions. Exposure to higher levels may cause unconsciousness or death within minutes of exposure.
@Ducky1138 You appear to be unclear on the definition of fluid. In common speach they are often used interchangably but there is technically a difference. Simply put, a fluid can be any material which can flow, which includes gasses as well as liquids. The critical point is the point on a pressure/temperature graph at which the transition from two distinct phases (liquid and gas) to a single phase (as shown in the video) occurs. As this exists above that point it is called super-critical.
I would have expected this as part of a physics demonstration, we're seeing physical properties of phase-changes that are done and undone by physical means.. Was this experiment initially discovered performed by a physicist? Why is it called a Super-critical Fluid, rather than a Super-dense Gas? Does the Super-critical Fluid have more properties related to fluids than gases? Is CO2 condensed to make this since at room temperature it's a gas already?
Depends on your definition of a pollutant. It fits the common definition: "Pollution: introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the ecosystem" But other groups only consider elements toxic to humans (such as Carbon Monoxide) to be pollutants. But all this detracts from the main issue, large amounts of man-made CO2 (mostly from burning coal, oil, etc.) is causing the planet to heat up at an accelerated rate.
Sorry, oomblikkies, I guess I didn't explain what I meant very clearly. If you needed to use a solvent in the manufacture of a replacement body part, maybe a mechanical heart or pacemaker, then a supercritical fluid used as a solvent would be a better choice than say, benzene (random example) that might remain residually and leach out. No body tissues need be harmed by the pressure ;p
am i confusing super critical with super heated."a pressurized liquid will stay liquid past its point of boiling"?i herd of it in steam engine design on a wiki site or sumthin about injecting super critical water into an unpressurized cylinder it expands quickly becoming gas.you know the rest it was supposedly a better than conventional steam type engine power/weight ratio wise. kinda make sense but yours didnt stay water it deffinitly didnt look like i imagined it if it is even the same thing??
If you put a tiny sealed drum inside and was spun like a car tire and it had a small hole one side and a axle on the other to spin it. Would a phase bounder form from hole to the spinning inside tangent edge be formed? A gas to super critical from the centrifugal force. The inside would have fin to help the gas get moving.
the pressure and temperature go below the Tc and Pc. This causes the liquid droplets to condense because there energy is low and the gas to bubble out because the molecules making the gas have a higher energy. This make a phase boundary quite rapidly and produces the storm ( the separation of the supercritical fluid into liquid and gas phases)
I can see you haven't passed High school chemistry as yet. A supercritical fluid is a fluid at which the phases of liquid and gas of a substance are almost indistinguishable since the pressure is so condensing gas and the temperature is so high the liquid evaporates and this simultaneous change causes the phases to almost meld to make one supercritical fluid phase.
cool vid, since that bank of england video I don't really like this bloke though. Max Keiser said in response to him saying 'its a shame its just sitting here not doing anything' "Yeah, it's only doubled in value over the last 10yrs" (or something), I lol'd. He should fix the screen so it's not that cloudy.
So this brilliant guy talking about his amazing job is what you call an idiot? Then what would you call a guy who films the portal 2 intro, can't capitalize,or properly use ellipses (...)? If you want to troll, than I recommend trolling the westboro baptist church, the Neo-Nazis, the KKK, or other groups more deserving of this sort of treatment.
Supercritical fluids form the harshest environments in the world. If you need to destroy a chemical or do wastewater treatment, it'll definitely do the trick...if the container lasts that is. Even high density stainless steel doesn't stand a chance for long. Containing the supercritical fluid while using it in an application is a very important problem to solve.
1. Did they say we could ignore global warming? Cause I'm not remembering that part of the video. 2. Yes, we can, because the earth hasn't actually warmed significantly in the last 12 years, disproving the conventional model of CO2 levels being temperature change's main drive.
Couldn't that simply be because places with high CO2 levels are more likely to have high levels of CO? I've never actually heard of someone dying from CO2 poisoning so I didn't think it was toxic, but maybe they usually just die from CO poisoning first, because it's more toxic.
This is what i did my Sr. project on in College. It was probably the coolest project i did in college. I used SCF to extract all the fat out of potato chips to become familar with the instrument which ill never forget, and which is why i wont eat chips to this day. haha
@jagara1 You need to do some reading to understand surface tension. No one here knows how much you do or do not know already nor could we explain it to you without that knowledge. Hell, Wikipedia should have a long article that can answer your questions.
I was not interested because I did not really understand what was going on here(I have a BSc in computer science) - I think we need more background, expecting us to say "wow!" is not really fair given the lack of information you have supplied us with...
@Defonthana Yes, providing it is stable and does not decompose at the critical temperature and pressure, every substance can be made supercritical. For instance, some of the very efficient power generation plants use supercritical steam.
The significance is from 3:43 to the end. Since you can use the supercritical fluid as a solvent instead of an inorganic solvent, it would be useful in medicine where an inorganic solvent introduced into an organism might be harmful, for example.
@jagara1 You misunderstand. I don't care if you understand it. I learned surface tension in high school and while the math is complex, I didn't have problems understanding it. Its not my problem that you don't get it.
I first saw this demonstrated by my physics teacher at the University of Aalborg, Denmark in 1983 and I haven't seen it since - until now. Thank you for sharing. I remember how I was amazed and touched by the beauty of this tiny experiment. We didn't have cameras back, but some lenses and a light source prjected the image on a big screen, It was very fascinating to see these phaseshifts.
They don't "almost meld" They do become one there is no phase boundary.... That is what happens above the critical point. Look on a phase diagram for Carbon dioxide sometime and you will see what I mean.
@jagara1 Hahahaha. I'm not your teacher nor do I owe you anything. Be proactive and go find the answers yourself. You're already signed into Google, try going to their homepage and typing in your question.
I working on solubility of salts right now learning about Ks. So how would the Ks value change in supercritical solvents than in conventional solvents? If you could ask the professor.
@yo6ial CO2 is not poisonous, literally. i mean it is for human beings and most animals but not for plants and that's only one example. the professor is correct when saying that.
@Gammaclipper CO2 has been used to slaughter animals in some experiments to determine a new method of execution but hypoxia induced by nitrogen asphyxiation was found to be less painful.
Can lower temperature supercritical fluids be used as lubricants, or as a suspension matrix for industries ? It would appear that they have a greater measure of "slipperiness"
But on a small scale the inside will become super critical and will cause cooler co2 to move to the middle were it is not super critical like a Ranque-Hilsch vortex tube.
The only Thing that would be different is that it wouldnt quite have that line in the middle, because the gas and the liquid actually weigh the same, nothing.
I'm doing a speech on aerogels and I was looking for a simple explanation of supercritical fluids, oh well, I guess I'll keep looking. Good video otherwise though.
its kind of cool how you can have the liquid and gaseous co2 under the same pressure... If I could ask, what is the pressure in the containing vessel professor..?
