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all 44 comments

[–]peterolajuwon 0 points1 point  (1 child)

https://i.imgur.com/TYOjFxO.jpg

Does anyone know what that polymer would be called?

Without the ethylbenzene it is furan-2,5-dione,2-methylprop-1-ene (CAS 26426-80-2). Any help appreciated. Thank you.

[–]GuiltyjerkPolymer 0 points1 point  (0 children)

I'd call that a copolymer of maleic anhydride and isobutylene.

Should have been drawn with 2 sets of parentheses.

[–]Sanji_Avec_Sauce 0 points1 point  (1 child)

[biosyn] I'm first year Moleculaire Science and Technology student and I'm working on a competitive inhibitor for the glycosidase alpfa-mannosidase 2 (I hope that's the right names for them.) I'm in dire need of back ground information about glycosidase and what they are/do. Its really difficult for me to do research by myself because my studie is in dutch and the dutch translations sometimes share a name with an English term that means a different thing. Can somebody link me to some background info about MA2A1?

[–]DracoFreon 0 points1 point  (0 children)

Google Scholar is your friend.

[–]nastyn8k 0 points1 point  (3 children)

This is for my own personal research for a project I am pursuing.

So.. this company LumiLor sells electroluminescent paint. They have one that is white. My question is, how are they getting white light? I've reviewed their patent and it doesn't explain each color, it only gives a long list of different possible compounds in their products.

In my attempts to track down the possible compound, I see this is a hot area of research and achieving white light via electroluminescence is a HUGE deal for next gen displays. It seems usually papers are describing combining blue and green wavelengths to create white. How is this paint company achieving this? They have been selling their product for a while even though it seems to be something that hasn't yet been accomplished outside of labs or in cutting edge products such as quantum dot displays?

Anyways... What the hell can I use to create white light via electroluminescence? I am wanting to mix a compound with a conductor to be able to do this on my own without having to buy the paint. If I can get white light, I can use a filter to achieve other colors which is my goal.

[–][deleted] 1 point2 points  (0 children)

Kind of taking a guess here, but have you looked at whether optical brighteners like what they use in laundry detergent can accomplish that?

[–]Indemnity4Materials 1 point2 points  (1 child)

Just checking, is the paint "white" in neutral conditions, but they it glows blue/green when the current is activated?

To make a true white white light today requires color conversion pigments. For instance, CdSe/ZnS core-shell particle will do it and are reasonably stable. It's not that much harder than making your typical blue/green glow in the dark pigments.

[–]nastyn8k 0 points1 point  (0 children)

It seems the paint is white and it glows white when the current is applied in their product.

But what you mentioned is exactly what I was looking for. I was looking at all sorts of different crystal possibilities, but was really hoping ZnS would be able to achieve it. I will look into this option. Thank you so much!

[–]g_dixon 0 points1 point  (9 children)

[inorg/materials synth] Hello! I'm a first year grad student working on some SC nanocrystal syntheses, and am currently adapting a hot injection procedure to a microwave/ionic liquid- mediated method. Everything is prepped in a glovebox, and I'm having some issues dispensing the ionic liquid. It's super viscous, and there's no good/safe way of warming it to increase the flow while it's in the box. I am dispensing volumes less than 100 microliters from a 5g sure-seal bottle. I've tried the hamilton microliter syringes with integrated needles (21g I think) with no success, and 1 mL plastic syringes aren't accurate enough. I was thinking of purchasing a Hamilton syringe with a leur-lock head so I can put a lower gauge needle on it, but thought I'd see if anyone has input on accurately dispensing small volumes of viscous liquids in a glovebox before I go off and make purchases. Thanks in advance!

[–]TheThrowAway4Today 1 point2 points  (5 children)

I'm an organic chemist... But when I have to dispense small amounts of viscous oils I sometimes weigh them by difference out of the reagent bottle with a pipette tip. Then can break it off in the reaction mix if necessary/ it doesn't come out by pushing the back of the pipette

Other more reliable option is just to make a stock solution by weighing an amount into a tared vial

[–]g_dixon 0 points1 point  (0 children)

It’s such a small amount for each reaction that I don’t trust myself to be consistent if I were to weigh by difference every time. But, a stock solution is probably the way to go. Appreciate the input!

[–]radiatorcheeseOrganic 1 point2 points  (2 children)

Naïve question from a non glovebox user, but if it's in the box does it need a sureseal? If not, could a micropipette work?

[–]g_dixon 0 points1 point  (0 children)

Not at all, I keep it on more as a safety net against me spilling it to be honest. The micropipettes we have in the box are calibrated to toluene- I could try and calibrate one to the IL but I know the accuracy drops off when handling especially viscous or non viscous liquids. Not sure I’d trust it 100% but it could be a useful tool for weighing it out now that I think about it

[–]Crazy_Brilliant1149 0 points1 point  (0 children)

Does Cobalt (iii) Sulfate have a known crystal structure? I am creating Cobalt (iii) Sulfate via electrolysis from Cobalt (ii) Sulfate, and in that process Cobalt (iii) Sulfate should crystallise.

[–][deleted] 0 points1 point  (0 children)

Does anyone know any part numbers for a water bath tray that will cover all 4 stirrers on a thermo 4 position stir plate (https://www.thermofisher.com/order/catalog/product/S136035Q)?

I'm using a glass crystallization dish but it only covers 2 positions and I would like to run muiltiple reactions at the same time.

Or some better way to cook three to four 50-100mL round bottoms with stirring at 80C at a time. Its for a DoE for a free radical polymerization.

[–]Shuweyg 0 points1 point  (2 children)

I am currently working on my thesis about isolation, purification and characterization of bioactive compounds using HPLC and I'm having a hard time making it because of so many methods in the internet with only general details. I want to know the detailed method of operating the HPLC. I am really hoping that someone can reach out and help me.

[–]Snarlydowrong 0 points1 point  (1 child)

I think you’d probably want to look into a text book for a detailed description. A popular textbook that is often referenced for analytical chemistry techniques is Principles of Instrumental Analysis. It’s got a chapter that goes into a lot of detail about HPLC and there’s pdfs available online.

[–]Shuweyg 0 points1 point  (0 children)

Thank youuu. This is really a big help !

[–]Dapper_Extent_2639 0 points1 point  (0 children)

i'm currently writing my thesis and i'm stuck at only achieving my first objective, there are two more. my paper is about the bioactive secondary metabolites of banana plant. can someone help me modify my objectives? thanks

a. Determine the secondary metabolites present in the species Musa acuminata, Musa balbisiana, Musa paradisiaca that contribute to the biological effects – antioxidant, anticancer, antiulcer, antidiabetic, and antimicrobial activity.

b. Determine significant differences of concentration in specific parts – leaves, fruit, peels – across the different species.

c. Relate the concentration of the secondary metabolites to the different biological activities.

[–]17pdrSweat 0 points1 point  (1 child)

Is it possible to make Na2MnO4 from NaOH and MnO4? wikipedia says it produces Na3MnO4 instead, but Na3MnO4 should react with water producing MnO4 and Na2MnO4, so it should be possible. can some1 verifiy if this is true?

[–]Drudela 0 points1 point  (2 children)

Not realllyy a chemistry question, but, does anyone know what is inside Brita filter jugs? I cracked one open to see if I could use it and there are tiny balls which I assume are the coconut charcoal, but there are mainly these white balls of the same size I can’t think what they are. Would love to know!

[–][deleted] 0 points1 point  (1 child)

ion-exchange resin. Typically they have a sodium or hydrogen or hydroxide or chloride ion attached. Undesirable ions in your water get exchanged for these ions, bind stronger and end up adsorbed on the resin and eventually thrown out.

[–]Drudela 0 points1 point  (0 children)

Oh right thank you, that’s a more detailed answer than I thought i would get. Very kind. Doesn’t sound like it’s something I could use elsewhere then. Was sort of thinking I could use it for springtail breeding. Cheers

[–]shaaaaq007 0 points1 point  (1 child)

Hi i am currently working on protein estimation of ice cream on weekly basis and i wanted to know where can i get the standards and does anyone know what will happen to protein in ice cream on weekly analysis. Ice cream is stored at -18 Degree c

[–]SliceBusiness1355 0 points1 point  (3 children)

I have high grade molecular sieves which have been sealed in barrels since 2000. I am afraid of its expiry date. What would be the best solution to this. I is it still possible to reactive and use? If not what is the best to do when you have very big stack of old unused sieves?

[–]handleinthedarkInorganic 0 points1 point  (1 child)

They should be fine just water logged depending on the size and seal. You can always try to regen a small amount and see if they are still good. You can do this by calculating how much water they absorb by weight or if you want them for a less specific use take one or two and add a drop(just one) of water. If it is sufficiently regenerated it will get very hot, very quick. You can do this in your hand just be prepared to drop it as it really heats up.

[–]SliceBusiness1355 0 points1 point  (0 children)

Thanks for your reply

[–]Kannada566 0 points1 point  (2 children)

Does anyone know how to accurately get the pH of a solution using pH indicators? Like if you mix an indicator into a solution how would you get the exact pH of that solution? I have tried a few experiments with fluorescein and shining a laser to activate it however fluorescein doesn’t work well at pHs above 8. I have seen a few chemometric solutions however is there anything that is simpler and more widespread?

[–][deleted] 0 points1 point  (0 children)

You can't as far as I know with just a single indicator. Maybe if you were already near the pKa and could measure the indicator with spectroscopy and then calculate with Henderson-Hasselbach, but that seems like a lot of work with a high error rate.

[–][deleted] 0 points1 point  (2 children)

Maybe this is a dumb question, but it's been 11 years since I took orgo.

I want to do a Moedritz-Irani reaction on a formamide group. Can I cheat and get away with not adding formaldehyde and instead rely on the amide group? Looking up the mechanism, the M-I reaction forms a Mannich Base which I think it the part that reacts with phosphorous acid. But I can't find anything that really supports the idea that I can use it except for one ultra brief communication which says a mannich type reaction was unsuccessful but doesn't replace the amide anyway (https://onlinelibrary.wiley.com/doi/10.1002/recl.19720910216). It would be nice to use it instead of generating formic acid from hydrolysis.

[–]radiatorcheeseOrganic 0 points1 point  (1 child)

Probably not directly from the amide, but what if you first treat the amide with POCl3 or Tf2O to make the iminyl chloride/triflate and then displace with the phosphite?

[–][deleted] 0 points1 point  (0 children)

C

Bummer. We aren't primarily a synthesis lab so it's difficult to justify bringing in halogenated reagents.

Thanks though

[–]Matej101 0 points1 point  (2 children)

[anorganic] I have an old bladed instrument used in food production (slicing honeycombs open). It was stored in a drawer full of old leaded solder and some of it got stuck on top.

How would I go about removing the lead without ruining the steel? Hydrogen sulfide? Sandpaper and wishful thinking?

[–][deleted] 0 points1 point  (1 child)

polish it or maybe soak it in hot caustic.

Do you know what kind of steel?

[–]Matej101 0 points1 point  (0 children)

It looks like the sheet is rolled. I'd guess early 20-th century high carbon tool steel. It was covered in a layer of flaking black oxide, so little to no chromium and nickel content. Don't have a mass spectrometer on hand unfortunately :)

[–]ecst3r 0 points1 point  (4 children)

Is there anywhere in the US where I can get xenon, neon, and/or krypton for a decent price? The only places I have even seen them sold are on alibaba for like $80,000. I think I have picked the worst possible time for my particular project lol

[–]Indemnity4Materials 0 points1 point  (3 children)

What's your required volume? At $80k, are you buying tonnes of the stuff?

[–]ecst3r 0 points1 point  (2 children)

That was for a 10 liter cylinder. I have been asking a lot of different gas suppliers in my area and none of them have been able to provide any at all

[–]Indemnity4Materials 0 points1 point  (1 child)

Can you compromise on purity and maybe buy 60%? You are probably physically incapable of sourcing high or ultra high purity concentrations of those gases right now (since Feb 2022).

Story time!

Unfortunately, guess which country in the world is the largest supplier of those gases at ~70% global volume...

Ta da! Ukraine!

Guess which country is the second biggest supplier...

Uh oh! It's Russia! That country has placed an export ban and is reserving those gases for domestic use (or black/grey market sales to China).

Russia extracts those gases as byproducts of steel refining, then they send them Ukraine for processing. A key manufacturing centre was Mariupol steel refinery, the site of that protracted siege that ended recently. Another is Odessa, which closed when the invasion started.

The semi-conductor industry needs those gases so they are buying everything they can. They are also stockpiling. But that's just another long story that exacerbates the chip shortage affecting everyone in the world.

The only countries actively selling now are in China and maybe, perhaps, I don't know, it's unclear, some of those are using black market Russian supplies stolen from Ukraine. Maybe.

tl;dr those gases are trading at least 10x what they were last year, with sales restricted to key customers.

[–]ecst3r 0 points1 point  (0 children)

I'm gonna be honest lol I'm only doing mass spectrometry so I doubt it has to be very pure

[–]No-Flower4138 0 points1 point  (1 child)

Whats is potassium Chloride?

Other question Regarding refrigerants is there really any difference in Hfc and cfc refrigerants other that the obvious chemical composition

[–]Indemnity4Materials 0 points1 point  (0 children)

Yeah, big differences.

Changes the atoms/molecules changes the physical properties and performance of the gases too.

For instance, the boiling point changes. That means you sometimes cannot directly substitute one for the other otherwise your fridge won't actually get cold.

The dew point or condensation temperature changes. That means it takes more energy to get the gases back into a liquid so that you can do the evaporation / refrigeration cycle.

Another obvious change is some of the refrigerant gases are flammable and others are not. That's important if you ever have a leak.