Exactly. It isn't that things made in China are low quality, it's that a lot of things of low quality are made in China. Verifying your supplier is pretty important in almost any serious application.
Cody'sLab anyone know if the cheap seeves holding temp in experiment #1 while the expensive seeves dropped temp rapidly signifies anything? this is a very old video know one realized who Cody was.
For cheap undenaturated alcohol you can just take Ethyl acetate, which costs nearly nothing(I paid 4$ a Liter), then throw in a bunch of NaOH and distill of the Ethanol ;)
Yes but I'd distil first. A compound I made and used - 2,2-dimethoxypropane - is made from acetone and methanol with a sulphuric acid catalyst. It's used because it is a vastly superior reagent to acetone alone for making acetal protoecting groups. I was using it to produce 1,2-5,6-di-isopropylidene-D-glucose from 1,2-isopropylidene-D-glucose. The 1,2 actal is extremely stable and goes on really easily, you tend to get 50:50 yields of the di and mono product when starting from glucose and just using dry acetone. It's best to then use 2,2-dimethoxypropane on the mono product to drive to completion. When producing the reagent it is isolated by fractional distilation, however since the raction is reversible, you need to do the reaction and constantly remove the water formed. I do this the same way Nerdrage made ethyl propionatae (I actually got the idea from him), using a soxhlet extractor and 3 Å sieves. The product is then isolated by fractional distilation and stored over 4 Å sieves to MeOH from the product. Any acetone contamination is not an issue, since it acts as a reagent anyway - just not as good
"they exceeded my expectations, probably given i had none to begi nwith" you really had me laughing there Nurd. that´s why we guys love you. your videos are interesting and there´s always something to love at (let´s just say gallium induced structure failure of a baseball bat?)
Something i've learned is that where something is made has no effect on quality. But instead the quality control that is put in place does. Thus as long as the factory is made to perform the proper checks and a quality standard for the product is set, you don't get any problems. After all everyone tries to maximize efficiency and cost, so those checks and tests are not often welcomed. So if a company is allowed to take short cuts, don't expect them to put out something of quality.
Great test! I decided to still go with eBay because its a lot cheaper but I bought some molecular sieves on eBay that were not from China. The ones I bought were being sold on eBay in the US. I also noticed in your video the darker color of the Chinese sieves vs the lighter color of the authentic ones. So I took that into mind and bought ones that were lighter in color. I preformed the same test as instructed in the video with Chinese eBay sieves and US eBay Sieves and came up with some really promising results. The US eBay version seems to be of higher quality than the Chinese versions. So really eBay is not a bad place to buy chemicals and things like that. You just have to be smart and know the bad from the good. eBay is just a hit or miss really. I have bought most of my lab equipment from eBay and some from china and I have not had any issues with it yet.
That's actually a pretty good buy. I would say those were more likely to be a defective batch and sold off cheap rather than destroyed. They would have some valid uses. Thank you for that video it was interesting.
It would be interesting to put the samples through nitrogen adsorption analysis to see the average pore size. I've done this with some silica / alumina samples with good success
Green Silver nope. theres no pore size on orbeez. they're hygroscopic/hydrophilic. the polymer prefer to be bound with water, which increases the size of the polymer molecules. As the polymer links expand, water also gets trapped, which is why they also take such a long time to dehydrate. Think of it the same way as water mixing with ethanol. not all of the water binds to the polar hydroxyl group of ethanol and just sits between the molecules, which is why a 50/50 mix comes out at 98
Ah, super interesting and super useful! I hadn’t known about the heat of adsorption test to determine net surface area and pore size! (Are other alcohols like IPA or ethyl alcohol also suitable - assuming they’ve been dried to 100% concentration?)
Thanks for another great video. Using natural zeolite might be a less expensive way to adsorb (absorb?) water. It would be interesting to see if natural zeolite is at all pore size specific like your engineered zeolites are supposed to be. I use natural zeolite from the local pool chemical supplier and it costs less than $1 per kg.
natural zeolite would definitely be just random, amorphous pour sizes. Same way one can buy pure white silica flakes to use as a desiccant, doesn't mean you can just crush them up and use them for chromatography. chromatography grade silica is much much more expensive
Just wondering, from your experience, when you heat the zeolite after it has absorbed moisture, do the properties return or is there a lose in quality? How many times is this restoration cycle practical? Is there a temperature and time do you find works well in restorating the properties? And in the real world and not under pressure, how quickly does the sieve material absorb moisture? Any tips appreciated.
did you ever experiment with this... thermal batteries , I wonder if lower temperatures around 170F can be used to reactivate the sieve (over a longer time)...
Is getting on the ms a grey, burn-like color a sign of bad quality? or I just made a fluidification effect on them with the vacuum and they got that color?
would it be worth testing against larger alcohols to see how big the pores are? Also might be worth testing a methanol saturated batch against water to see if the pores are varied or just big. Varied would still mean significant numbers of small enough pores, so they could still dry solvents only grab some of the solvent with it. Big might make them useless for methanol, but potentially almost as good for larger solvents.
I work for a chemical company and we use 50% sodium hydroxide solution and once it hits the ground or another surface it turns purple. what would cause that?
Are the cheap ones made from fly ash? I wonder how contaminated they are with other metals. Also check if they are more radioactive, that is a dead give away.
Could you tell me if these adsorb more water then Silica Gel , i looked for the data 1 day and from what i gathered it was based on the temperature of the media . it seems silica gel was the strongest , im using it to dry air and was trying to see if molecular sieves worked better
Hey love your torches! I think there are a lot of inherent differences between silica and zeolite. Either one will adsorb more water if crushed into a powder. For some applications, there are simple inorganic salts that actually out perform either. e.g. Potassium Carbonate can salt out even 5% alcohol out of the rest of the water. Calcium Chloride, is more or less the king of air stream drying, but they will liquify very quickly.
if you would compensate the higher quantity is the price still better than the chemical supply companies? ;) Does 3A or a higher A reach higher temperature with water?
This is why low boiling point solvents begin to boil when sieves are added. The Chinese sieves do a little bit. You get what you pay for I guess is the maxim Thanks for your work
I have a question. I am using 13th sieve made in China. It is creating great deal of orangish residue, after absorbing a water from ethanol. I have great del of difficulties to remove that residue. It this normal, or hide quality sieve would not produce this residue?
@NerdRage Do you think these Ebay sieves would be of sufficient quality to pull the excess water from some ethanol (moon shine) for low grade laboratory use? yields tend be somewhere around 75%. (tested with a hydrometer float) The goal is 95% or better with minimal loss. I could probably refine my distilling process and achieve somewhere closer to 90% but I'm lazy and broke. lol
John dawson probably not, it's still an equilibrium. You'd experience a small change, but nothing near what you're looking for. Distillation is probably your best bet. Also to get anything better than 95% you need to use something to displace the water, what's used for lab grade alcohol is benzene. I don't recommend on using that if you plan to drink it unless your ok with getting leukemia.
Beowulf Owen LOL xD No i dont plan to drink it. The plan is to use it as a mixing catalyst for experimental rocketry and home made fireworks for family fun. Had a grandpa who passed away that use to make them and he had license to by a lot of what you need but we don't. Most of it is pretty simple to make though. Plus I'm interested in playing with mixture ratios and finding what works best.
I have considered the isopropyl aproach but the best i can buy without finding some dealer somewhere is 91%. Everclear is an option, but since i make grain alcohol around a gallon at a time i figured this might be a more economical approach considering i only need around a pint for the amount of materiel we will be making.
I'm searching for molecular sieve for the purpose of storing 3D printing filament and for feeding said materials from a drybox. Is there any difference or advantage between using a 3A vs a 13x grade for this particular use case?
how well would a dehydrator work for regenerating molecular sieves? the one I have maxes out at 160F/71C, but there's also convection to help evaporation.
NurdRage question, does it actually absorbe the carbon into the material or does it separate the CO2 from other gas's leaving a layer of CO2 that needs to be pumped out?
Hello! Would it be possible to dry propane from water and ethanol contaminants with these sieves? does sieves collect H2O in gas-form or does it have to be liquid? (For diy heatpump / hvac project with propane as refrigerant)
How well do sieves perform if activated and stored under air compared to if handled exclusively under an inert atmosphere? I use sieves a lot (mainly 4A) for either dry solvent storage or drying isopropanol and they are always activated under high vacuum and stored under nitrogen as I know they are extremely hygroscopic.
Interesting I have been looking for sieves to make an oxygen concentrator but I'm not sure what size I need or a supplier. Medical O2 concentrators are too expensive, since they are actually simple low pressure devices it should be fairly simple build. Any suggestions on which and where to get the sieves.
What is the correct price range when you purchased the sieves? It seem a little pointless telling us the cheap stuff doesn't work without telling us the cost involved.
Everyone here in the US goes with the EE sound but online dictionaries use the CIV. Also it is Middle English, not French. Comes from the word sife or sive and cognates with the Duich word zeef, and the German word sieb. Either way works for me because it is made of words with both the EE sound and IV sound. Being safe though CIV is a good bet because most of the world will say it that way, to include many major dictionaries and their pronunciation or phonetic guide. Passoire though is a French word meaning strainer or sieve. Colander would be the Latin word and folks still use to to mean pasta strainer. To avoid confusion they should just call them molecular colanders. I mean we name everything else from the dead Formal Latin in science, why the exception?
I tried purifying 40% vodka with some eBay molecular sieves made in the US! I waited a whole week and no difference at all! What do you think happened? My hydrometer gave me the same reading from before the experiment .
Joe Estes if it doesn't dissolve in the solvent you're trying to dry, yes. things like methanol/ethanol, some ionic compounds are slightly soluble in, which means that you have some contamination. dichloromethane is nonpolar and calcium chloride may work just fine for it.
Sam Sokolov they absorb molecules basically. So you can use them to extract water out of solution or something else, as long as they are the right size for the molecule.
I think that from the batch of lab grade molecular sieves, you should understand that the methanol was probably quite pure (with less water). Obviously he won't put different concentration methanol in the different sieves.
Just because something is made in China doesn't mean it's gonna be low quality. There's that old adage "you get what you pay for". But with Chinese goods, it's not that black and white. There are instances where inexpensive and even regular priced goods are of low quality. But there are also instances where lower to mid priced goods are as good or slightly better than more expensive stuff. I bought 2 Chinese 'Zebralight' brand LED flashlights 4 years ago. The SC600 was about $100 and the SC52 was approx $60. I carried the SC52 every day for 3 years til I lost it. It was rugged, well made etc. So is the SC600. However, I could've paid more for a Surefire LED light, and it wouldn't have any better, in fact, the Zebralights are both brighter and have more settings, and use the best American made LED's. I bought another Chinese light from Spark, which replaced my lost SC52, but it's switch broke in 6 months. There you go.... Both sides of the story.
car dehumidifier bag contain the chinese one for 5 buck kilo ...... maybe its kind of a recipe that react less fast to provide dehumidification for more than one day , i have one of that bag, ist dried in the microwave, and contain around 17/100 of they wheight of water after 2 week in the humid car
ew alfa aeser and sigma aldrich...hardly ever put expiration dates on their products which makes it annoying even when you look it up on their site sometimes it still doesn't have it
Btw...China makes excellent quality stuff....don't forget they manufacturer space crafts, satellites, weapons, cars etc..... one of the things they do is produce a product based on the specs of the customer..... so what is really the case is that many customers who outsource goods to the Chinese also ask them to make it as cheap as possible. ..so their returns on sales is much higher
you should make a video showing were we can find companies who sell to amateurs to buy chemicals. you could also possibly get profit from them if they sponsor. I know you made a video previous on it, but that's very old. #staynerdy
Still fixing the time machine.
Classic
once it's done can you go way in to the future and do a vlog
you can call it "future vlogs with rage"
FIRS---
Wait, no, huh? Darn NurdRage and his time travel technology!
Hey NR, question; Can you reuse MS? or are they true disposables?
you can reuse them, just heat them up to 200°C and wait a few hours, they will release water
Exactly. It isn't that things made in China are low quality, it's that a lot of things of low quality are made in China. Verifying your supplier is pretty important in almost any serious application.
siege... i before e
you forget to capitalize and punctuate (like me) @@anagennao
Could 4a sieves be used to un denature alcohol that has had methanol added to it?
Cody'sLab Personally I would fractionally distill the methanol from the ethanol. Just made a still-will let you know when I do a run.
Cody'sLab anyone know if the cheap seeves holding temp in experiment #1 while the expensive seeves dropped temp rapidly signifies anything?
this is a very old video know one realized who Cody was.
Buy Sverclear, Silver Springs, etc. and remove the other 5%.
For cheap undenaturated alcohol you can just take Ethyl acetate, which costs nearly nothing(I paid 4$ a Liter), then throw in a bunch of NaOH and distill of the Ethanol ;)
Yes but I'd distil first. A compound I made and used - 2,2-dimethoxypropane - is made from acetone and methanol with a sulphuric acid catalyst. It's used because it is a vastly superior reagent to acetone alone for making acetal protoecting groups.
I was using it to produce 1,2-5,6-di-isopropylidene-D-glucose from 1,2-isopropylidene-D-glucose. The 1,2 actal is extremely stable and goes on really easily, you tend to get 50:50 yields of the di and mono product when starting from glucose and just using dry acetone. It's best to then use 2,2-dimethoxypropane on the mono product to drive to completion.
When producing the reagent it is isolated by fractional distilation, however since the raction is reversible, you need to do the reaction and constantly remove the water formed. I do this the same way Nerdrage made ethyl propionatae (I actually got the idea from him), using a soxhlet extractor and 3 Å sieves. The product is then isolated by fractional distilation and stored over 4 Å sieves to MeOH from the product. Any acetone contamination is not an issue, since it acts as a reagent anyway - just not as good
Thanks for showing both tests. Very interesting from someone who never used anything beyond MgSO4 or a schlenk line for working with dry materials.
Is it possible that the sieves that were on ebay are cheap because they're from a failed batch?
Just like cheap high power LEDs, these are most likely factory rejects.
"And I found a supplier in China at a price that was too good to be true..."
Thanks for the video. This is actually very useful to me! Like any other of your video, this is a GREAT JOB. Thanks over and over
"These micro sieves exceed my expectations. Primarily because I had none to begin with" LOL 4:16
The one-star review was a dead giveaway ! :D
You cannot always believe in star ratings
that was from 1 rating
Maybe it’s him who posted the review and he made the video later?
"they exceeded my expectations, probably given i had none to begi nwith" you really had me laughing there Nurd. that´s why we guys love you. your videos are interesting and there´s always something to love at (let´s just say gallium induced structure failure of a baseball bat?)
Something i've learned is that where something is made has no effect on quality. But instead the quality control that is put in place does. Thus as long as the factory is made to perform the proper checks and a quality standard for the product is set, you don't get any problems. After all everyone tries to maximize efficiency and cost, so those checks and tests are not often welcomed. So if a company is allowed to take short cuts, don't expect them to put out something of quality.
Great test! I decided to still go with eBay because its a lot cheaper but I bought some molecular sieves on eBay that were not from China. The ones I bought were being sold on eBay in the US.
I also noticed in your video the darker color of the Chinese sieves vs the lighter color of the authentic ones. So I took that into mind and bought ones that were lighter in color.
I preformed the same test as instructed in the video with Chinese eBay sieves and US eBay Sieves and came up with some really promising results. The US eBay version seems to be of higher quality than the Chinese versions.
So really eBay is not a bad place to buy chemicals and things like that. You just have to be smart and know the bad from the good. eBay is just a hit or miss really.
I have bought most of my lab equipment from eBay and some from china and I have not had any issues with it yet.
Video quality on these video's are insanely good :) i like it!
Idea: Send some of each kind to Applied Science to image with his electron microscope!
AppliedScience is a NurdRage patron? Nice.
are you talking about ASIC corp? I know who they are!
That's actually a pretty good buy. I would say those were more likely to be a defective batch and sold off cheap rather than destroyed. They would have some valid uses. Thank you for that video it was interesting.
"cast your own aluminum butt plug"
that was in my suggestions... wtf Google?
The Janted Jangler Aluminium*
Common wealth English, or American English? Aha!
Zamandu American Grammer is better because reasons!
Grammer? Really?
Grammar oh me oh my!
Great video, I think more videos like these would be good.
excellent video, much needed
It would be interesting to put the samples through nitrogen adsorption analysis to see the average pore size. I've done this with some silica / alumina samples with good success
Great test.
You are very great in chemistry. ☺
chemestry? yes, storing those chemicals? not so much :)
So this is why these Orbees will swell in water and not alcohol, it's all down to the pore size in the absorbent material?
Green Silver nope. theres no pore size on orbeez. they're hygroscopic/hydrophilic. the polymer prefer to be bound with water, which increases the size of the polymer molecules. As the polymer links expand, water also gets trapped, which is why they also take such a long time to dehydrate. Think of it the same way as water mixing with ethanol. not all of the water binds to the polar hydroxyl group of ethanol and just sits between the molecules, which is why a 50/50 mix comes out at 98
Zivilyn The Wyrd
Thanks, I've learned something today. :)
green silver - your initial comment was correct.
The are in fact just that sieves designed to have a very specific pore diameter.
Green Silver a
Cool, I had no idea that molecular sieves existed.
0:16
they had a One Star rating.. no?
Ah, super interesting and super useful! I hadn’t known about the heat of adsorption test to determine net surface area and pore size! (Are other alcohols like IPA or ethyl alcohol also suitable - assuming they’ve been dried to 100% concentration?)
Thanks for another great video. Using natural zeolite might be a less expensive way to adsorb (absorb?) water. It would be interesting to see if natural zeolite is at all pore size specific like your engineered zeolites are supposed to be. I use natural zeolite from the local pool chemical supplier and it costs less than $1 per kg.
natural zeolite would definitely be just random, amorphous pour sizes. Same way one can buy pure white silica flakes to use as a desiccant, doesn't mean you can just crush them up and use them for chromatography. chromatography grade silica is much much more expensive
can you do a video on how to make NO2
Just wondering, from your experience, when you heat the zeolite after it has absorbed moisture, do the properties return or is there a lose in quality? How many times is this restoration cycle practical? Is there a temperature and time do you find works well in restorating the properties? And in the real world and not under pressure, how quickly does the sieve material absorb moisture?
Any tips appreciated.
did you ever experiment with this... thermal batteries , I wonder if lower temperatures around 170F can be used to reactivate the sieve (over a longer time)...
I just wonder I have molecular Sieve 3a high grade but very old since 2004
Is it possible to reactivate it and use it
but what are molecular sieves used for?
0:04
Selectively filtering out water or other unwanted chemicals when it is otherwise impossible or difficult to separate them out
Is getting on the ms a grey, burn-like color a sign of bad quality? or I just made a fluidification effect on them with the vacuum and they got that color?
would it be worth testing against larger alcohols to see how big the pores are? Also might be worth testing a methanol saturated batch against water to see if the pores are varied or just big. Varied would still mean significant numbers of small enough pores, so they could still dry solvents only grab some of the solvent with it. Big might make them useless for methanol, but potentially almost as good for larger solvents.
Sometimes they are made by the same company. Maybe rejected batches they try to sell rather than waste?
I work for a chemical company and we use 50% sodium hydroxide solution and once it hits the ground or another surface it turns purple. what would cause that?
If I found a canister of old molecular sieves...can they be cleaned?
I like Nurdrage's pronunciation of "seeves".
How would you rate the 3A molecular sieve from Sorbent media, Inc??
Are there any situations in which the cheap sieves would be adequate? love the vid btw
Maybe for drying liquids that have a relatively large molecule.
It all depends on how pure you need your final product to be
if yu wanna get rid of water AND methanol? seems to work (given you pour in enough of these things^^)
Are the cheap ones made from fly ash? I wonder how contaminated they are with other metals. Also check if they are more radioactive, that is a dead give away.
Super intresting.thanks for the education.
Are these kind of molecular sieves food safe? Could one, say, separate water and alcohol in beer or wine?
Could you tell me if these adsorb more water then Silica Gel , i looked for the data 1 day and from what i gathered it was based on the temperature of the media . it seems silica gel was the strongest , im using it to dry air and was trying to see if molecular sieves worked better
Hey love your torches! I think there are a lot of inherent differences between silica and zeolite. Either one will adsorb more water if crushed into a powder. For some applications, there are simple inorganic salts that actually out perform either. e.g. Potassium Carbonate can salt out even 5% alcohol out of the rest of the water. Calcium Chloride, is more or less the king of air stream drying, but they will liquify very quickly.
I'd love to see a test with ethanol. Just how big do those pores go?
Go to a double glazing manufacturer, they use it in the spacer bar. Best when you fill a plastic cup pour some water in & watch the cup melt.
if you would compensate the higher quantity is the price still better than the chemical supply companies? ;)
Does 3A or a higher A reach higher temperature with water?
This is why low boiling point solvents begin to boil when sieves are added. The Chinese sieves do a little bit.
You get what you pay for I guess is the maxim
Thanks for your work
can this be used to concentrate hydrogen peroxide? assuming the h2o2 molecule is too large to be absorbed.
MrTurboturbine if you're looking to concentrate it, put it in the freezer, then filter out the H2O crystals. Sorry, I can't remember where I saw that.
I want to do this test. How many ml per MS do you use for that 47° on temperature?
Can sieves be used to remove water from ethanol and can sieves be dried and reused? Thanks for another great video!!
1. yes if they are 3A, as Mr. Nurdrage explains in the first 20 seconds 2. yep
I like your videos! :)
But try pitchshifter @ -2 instead of -4 or -3 ;)
I have a question. I am using 13th sieve made in China. It is creating great deal of orangish residue, after absorbing a water from ethanol. I have great del of difficulties to remove that residue. It this normal, or hide quality sieve would not produce this residue?
could you show us how we do the gold bacteria for growing the gold
@NerdRage Do you think these Ebay sieves would be of sufficient quality to pull the excess water from some ethanol (moon shine) for low grade laboratory use? yields tend be somewhere around 75%. (tested with a hydrometer float) The goal is 95% or better with minimal loss. I could probably refine my distilling process and achieve somewhere closer to 90% but I'm lazy and broke. lol
John dawson probably not, it's still an equilibrium. You'd experience a small change, but nothing near what you're looking for. Distillation is probably your best bet. Also to get anything better than 95% you need to use something to displace the water, what's used for lab grade alcohol is benzene. I don't recommend on using that if you plan to drink it unless your ok with getting leukemia.
Beowulf Owen LOL xD No i dont plan to drink it. The plan is to use it as a mixing catalyst for experimental rocketry and home made fireworks for family fun. Had a grandpa who passed away that use to make them and he had license to by a lot of what you need but we don't. Most of it is pretty simple to make though. Plus I'm interested in playing with mixture ratios and finding what works best.
I have considered the isopropyl aproach but the best i can buy without finding some dealer somewhere is 91%. Everclear is an option, but since i make grain alcohol around a gallon at a time i figured this might be a more economical approach considering i only need around a pint for the amount of materiel we will be making.
How to filter or remove calcium chloride gas from air.
Those cheap sieves, can they be used as a heat generator for your hands?
Use the sieves to make hand warmers.
I'm searching for molecular sieve for the purpose of storing 3D printing filament and for feeding said materials from a drybox. Is there any difference or advantage between using a 3A vs a 13x grade for this particular use case?
For that purpose you could use either.
thanks for this good work!
The cheaper stuff you bought may be rejects in the QC process of the more expensive sieves.
do you think that they were very old stock? or would that even apply?
Hi, do you know some materials that dilate by the water? Thanks.
what is the name and brand name of that device he sets the jars on to measure their temperature?
I use the dry rice..is it true?!
how well would a dehydrator work for regenerating molecular sieves?
the one I have maxes out at 160F/71C, but there's also convection to help evaporation.
you can use an oven so i am fairly sure a dehydrator would work too
What zeolite crystal is needed to absorb CO2?
I think type 4A is used for CO2 absorption.
Thanks
So these are perfect?
NurdRage question, does it actually absorbe the carbon into the material or does it separate the CO2 from other gas's leaving a layer of CO2 that needs to be pumped out?
Hello! Would it be possible to dry propane from water and ethanol contaminants with these sieves? does sieves collect H2O in gas-form or does it have to be liquid? (For diy heatpump / hvac project with propane as refrigerant)
How well do sieves perform if activated and stored under air compared to if handled exclusively under an inert atmosphere? I use sieves a lot (mainly 4A) for either dry solvent storage or drying isopropanol and they are always activated under high vacuum and stored under nitrogen as I know they are extremely hygroscopic.
You should buy 3-5 different sieves off different sellers on eBay and see which is the best choice for us poor guys.
Yeah, would love some links to known good sources for hobbyists...
TheAmmoniacal Thanks! Are those ones you know to be decent quality?
Thunderbelch No, not tried any of them. Those are the ones I want NurdRage to test!
@N K
yo North Korea, you done with that adsorbtion testing yet?
Interesting I have been looking for sieves to make an oxygen concentrator but I'm not sure what size I need or a supplier. Medical O2 concentrators are too expensive, since they are actually simple low pressure devices it should be fairly simple build. Any suggestions on which and where to get the sieves.
I'm not positive but, 13X Zeolite Molecular Sieve Type 13X 4x8 mesh
What is the correct price range when you purchased the sieves? It seem a little pointless telling us the cheap stuff doesn't work without telling us the cost involved.
does the heat output ever become a problem?
Is that "seeve" pronunciation of "sieve" a US thing or a NurdRage thing? Here in the UK it's definitely a "civ"/"sivv"
Everyone here in the US goes with the EE sound but online dictionaries use the CIV. Also it is Middle English, not French. Comes from the word sife or sive and cognates with the Duich word zeef, and the German word sieb. Either way works for me because it is made of words with both the EE sound and IV sound. Being safe though CIV is a good bet because most of the world will say it that way, to include many major dictionaries and their pronunciation or phonetic guide. Passoire though is a French word meaning strainer or sieve. Colander would be the Latin word and folks still use to to mean pasta strainer. To avoid confusion they should just call them molecular colanders. I mean we name everything else from the dead Formal Latin in science, why the exception?
real informative vid!
I tried purifying 40% vodka with some eBay molecular sieves made in the US! I waited a whole week and no difference at all! What do you think happened? My hydrometer gave me the same reading from before the experiment .
My molecular sieves are from a company called molecular boss.
on the water test, is that run in real time or time-lapse? if tme lapse how much time passed?
opposite actually, it's been slowed down, total temperature spike takes about 20 seconds.
Do an Argon physisorption and pore size distribution !
Hi man this a question what did you study for this I know chemistry but to know all this stuff
hm. 70 degrees is the perfect temperature for green tea
Hi Nurd, I'm curious. Do you actually have a PhD in Chemistry? If so, what was the topic of your thesis?
N Kayser Yes I'm aware. Thanks for not answering the question.
Nurd, you got a new hotplate, it seems?
more accurately i had one of my old ones repaired. I'm still looking for ways to repair my two other hotplates.
is calcium chloride a good choice if you don't have sieves?
Joe Estes if it doesn't dissolve in the solvent you're trying to dry, yes. things like methanol/ethanol, some ionic compounds are slightly soluble in, which means that you have some contamination. dichloromethane is nonpolar and calcium chloride may work just fine for it.
Ok thanks!
Hi, I'm a high school student and am interested in chemistry and fairly new to it, what do these sieves do?
Sam Sokolov they absorb molecules basically. So you can use them to extract water out of solution or something else, as long as they are the right size for the molecule.
did you use methanol with a small amount of water or a large amount of water?(%)
I think that from the batch of lab grade molecular sieves, you should understand that the methanol was probably quite pure (with less water). Obviously he won't put different concentration methanol in the different sieves.
ahh...dude, the china one is natural/mined and the lab grade would be synthetic?
Why exactly does the water get hot!? This is just amazing...
similar to the release of heat when evaporating, but it's forced "sorption" that releases heat
Do you speed up the audio?
Thanks
I have no idea what any of this meant. But I love to learn new things.
Just because something is made in China doesn't mean it's gonna be low quality. There's that old adage "you get what you pay for". But with Chinese goods, it's not that black and white. There are instances where inexpensive and even regular priced goods are of low quality. But there are also instances where lower to mid priced goods are as good or slightly better than more expensive stuff. I bought 2 Chinese 'Zebralight' brand LED flashlights 4 years ago. The SC600 was about $100 and the SC52 was approx $60. I carried the SC52 every day for 3 years til I lost it. It was rugged, well made etc. So is the SC600. However, I could've paid more for a Surefire LED light, and it wouldn't have any better, in fact, the Zebralights are both brighter and have more settings, and use the best American made LED's.
I bought another Chinese light from Spark, which replaced my lost SC52, but it's switch broke in 6 months. There you go.... Both sides of the story.
He mentioned the whole China - Quality thing in the video. 4:26
I wish you would have weighed them before and after. Great video though
car dehumidifier bag contain the chinese one for 5 buck kilo ...... maybe its kind of a recipe that react less fast to provide dehumidification for more than one day , i have one of that bag, ist dried in the microwave, and contain around 17/100 of they wheight of water after 2 week in the humid car
Thank " big bang" for discovering this
I got some of these cheep ones and they were good enough for what I was doing, but wouldn't buy them again
You should buy your Molecular Sieve from brownell ltd they have the best and most absorbant at low prices
thanks for the tip!
"This test isn't all that scientific..." You mean those aren't borosilicate baby food jars? ;)
ew alfa aeser and sigma aldrich...hardly ever put expiration dates on their products which makes it annoying even when you look it up on their site sometimes it still doesn't have it
Is 20$ for 1kg cheap!
In fact those china sieves aren’t even that expensive if you buy them in china. I could get one for us$1.5
Btw...China makes excellent quality stuff....don't forget they manufacturer space crafts, satellites, weapons, cars etc..... one of the things they do is produce a product based on the specs of the customer..... so what is really the case is that many customers who outsource goods to the Chinese also ask them to make it as cheap as possible. ..so their returns on sales is much higher
you should make a video showing were we can find companies who sell to amateurs to buy chemicals. you could also possibly get profit from them if they sponsor. I know you made a video previous on it, but that's very old. #staynerdy