I am a Chemist Vtuber who does videos mostly on electrochemistry and other topics that relate to chemistry in general. My Vtuber persona is called nyanchemistry aka Neru Chan, whichever one pops up more. Twitch: twitch.tv/nyanchemistry
I would like to try and replicate this. Thank you for the video and for sharing so much information. Can you suggest any simple tests one could perform to verify if the membrane is working correctly?
@@ferriswhitehouse1476 compare conductivity with porous PVC substrate alone in a setup in brine or NaOH or Na2SO4. Set same distance and same voltage and measure and compare current. Be wary that temperature affects the ion mobility so be sure to do it in a temp controlled environment.
@@CatboyChemicalSociety Makes sense. Thanks again. How important is the concentration of the quaternary ammonium salt? I just picked up some cleaner with benzalkonium chloride but there is no information on concentration of course. I found an sds on a similar cleaner that show concentration was 0.1 - 1%. So I would need to use quite a lot of that right?
@@atharvah2705 if its for brush plating then just skip PVC step and bake the citric and PVA directly onto substrate then ofc after you can put the fluffy brush sleave over the membrane.
@@RittifiHffjdidi I have made a new type of membrane that lasts months in HCl and H2SO4 and that involves mixing PVC glue with powderized cation deionizer resin. These resins are also PS based and they seem to last very long and are very ionically conductive.
@@RittifiHffjdidi first you buy some cation resin pellets from the water filtration section of the hardware store. Anion pellets can be used if you desire anion exchange instead. Then you take these and get a 800W blender or coffee grinder and grind them to a fine powder. Then mix it according to this ratio 1:3 by weight resin to PVC glue and you can also thin the PVC glue with THF or cyclohexanone or chloroform to make it more workable. Then you paint this onto a substrate like cloth or fiberglass. Apply multiple coats and let it dry by the air and after its ready to use.
Would making something similar by putting HCl into cathode chamber and anhydrous ethanol into anode chamber and using a Aluminum anode make anhydrous alcl3?
Nope to do that you need propylene carbonate and an Al anode and NaCl and NaBr catalyst dissolved in it with no membrane required but you also need mineral oil to isolate it from the air. This cell produces AlCl3 and sodium metal.
Adding sodium chlorate will cause nearly pure potassium chlorate to drop out. Also, working with the carbonates tends to produce purer product because they are further apart in solubility when compared to the chloride.
Nice video, I tried something similar I put saturated NaCl solution into the Cathode chamber and Distilled water to the Anode chamber and used a clay pot as membrane at first it worked well but the Copper seems to form a non-conductive coating of insoluable Copper(I)Chloride that causes current to drop significantly.
Hello, sir. What do you think if in electrowinning/electroplating of iron, we added thiourea as an additive. Can we inhibit corrosion of deposited iron with that?
@@CatboyChemicalSociety Oh, so thats why you peeled the deposited iron from substrate. Currently, I'm doing a project to electroplate a carbon fiber mesh (CFRP) with Fe from FeSO4.7H2O electrolyte to make a Nickel-Iron Battery. May I ask, what other compounds that is non-toxic which likely can be added to electroplating bath as an additive to inhibit corrosion of the deposited metal? that will not precipitate salt in a KOH solution?
This is an older video and the latedt version is compositized crushed deionizer resin because it has higher conductivity than an ordinary porous barrier and higher selectivity
Hi MB, found this another interesting video.. could you advise me how to remove the graphite deposits if I use graphite? I tried a way first by using graphite, but found brown deposits likely the grpahite errode Thank you for your answer
@@gilbertquarshie3932 its not since you really only need the ionomer for milder conditions. all you need to do is bake PVA and citric on a substrate like fiberglass or cloth.
@@CatboyChemicalSociety How do I apply multiple layers of the PVA-Citric acid blend? (Im asking cause I realized some people run into a problem where the membrane was porous) Do I apply the on the substrate, bake and repeat process or I apply on the substrate wait for sometime and apply again then bake the whole thing
While its more selective towards monovalent cations im not sure how efficient it would be for seperation of divalent ions as they will still somewhat pass thru albeit slower but you could give it a try
@@CatboyChemicalSociety Thank you very much friend, one last thing, do you recommend a chemistry book to learn more about the interaction that molecules have with others.
I followed the direction by getting a cloth then putting the PVA and citric acid combination on a cloth then baking it for a microbial fuel cell. But what happened is the holes in the cloth are still too big. The water passed right through it, so it doenst really act as a membrane. What should I do instead? What kind of cloth should I use? Do you have an amazon link?
@@josephdvid6 yes a lot less after polarization this thing can pull 4 amps at 6 volts And the newer one yet to come will be even less resistance reaching 200ma/cm^2 at 5 volts. This is why I like ionomer cement, its castable and convinient and has less resistance than terracotta and is basically the middle man of ceramic membranes vs polymer ion exchange membranes. If you see cranial constructions latest video on sulfuric acid from epsom salts he puts 12V and only gets 0.12 amps which is terrible.
@@CatboyChemicalSociety nice I'm using it as a cation exchange membrane for large microbial fuel cells. Hydrogen fuel cells are the ones that use anion exchange membranes.
Oh, it's really bad. I have to admit that I failed. The main crystalline form of purified manganese dioxide in manganese zinc batteries is（ γ- MnO2, mixed with epoxy resin, is thermally coated on titanium plates to electrolyze chlorides. Very unsatisfactory, corrosion will appear after about a minute, and there will be a layer of reddish brown floating substance on the surface of the solution. If this phenomenon is electrolyzed with a solution of manganese nitrate hot coated titanium plate, the corrosiveness is minimal, and chlorate solution can also be produced by electrolysis, with only a faint purple color. I think it's very likely a problem with the crystalline form of manganese dioxide. （ α- MnO2 β- MnO2 ε- MnO2 and λ- I haven't tried any of these (MnO2) yet, and it's quite troublesome to do them
You have to heat deposited MnO2 at 400C and also just like PbO2 it cannot and should not be plated on bare Ti and needs an SnO2 undercoat for both baked or plated. This is due to interface oxidation of Ti which SnO2 doesnt cause.
That's too bad. I tried hot coating a layer of SnCl ₂ on the titanium plate to attach a layer of tin dioxide. Then apply another layer of epoxy resin and manganese dioxide by hot coating. The corrosion effect is the same when electrolyzing chlorides. I wonder if the tin dioxide coating is too thin?
I don't know if it's feasible, but the titanium surface is coated with a conductive material mixed with epoxy resin and tin dioxide, and then coated with a mixture of epoxy resin and manganese dioxide.
FOR pem membrane required for hydrogen production by electrolysis direct on clean cloth pva and citric acid is aplied no pvc and dechorination solution is required then baked the sheet
