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kristofvagyok
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[*] posted on 22-2-2014 at 15:35


Quote: Originally posted by Hegi  
Hey man, thank you for the idea, i´ve almost totally forget about that... ;) soon... Now it´s being recrystallised..
<img src="http://chem.pieceofscience.com/wp-content/uploads/2014/02/chromalum21.jpg" width="600" height="400">


As I see Hegedus is a popular name in Science photography;)
BTW great picture, what kind of camera/lens were used?


Something from me too:



Fun with fluorescent dyes part 3. In this case Eosin and Rhodamin B was used.




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Oscilllator
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[*] posted on 22-2-2014 at 19:19


Quote: Originally posted by bfesser  
That's a damned nice product&mdash;beautiful color! What are your plans for such a large quantity, though?

I'm afraid there are no special plans - I just went into the shops and bought 2 packets of aspirin. I am actually quite surprised that the product turned out as well as it did because halfway through the synth I realised I had used an excess of Na2CO3, so I added a dash of HCl to try and neutralise it.

Edit: Are there any further reactions that can be done with copper aspirinate? I was always under the impression that it was a dead-end in terms of reactions.

[Edited on 23-2-2014 by Oscilllator]




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Brain&Force
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[*] posted on 22-2-2014 at 22:24


kristofvagyok: I have a new wallpaper now, thanks!
Hegi: Your crystals remind me of copper acetate crystals. What's the scale on the photos?

Are you two twins separated at birth? Your photos say it all!




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Hegi
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[*] posted on 22-2-2014 at 23:46


Quote: Originally posted by kristofvagyok  


As I see Hegedus is a popular name in Science photography;)
BTW great picture, what kind of camera/lens were used?



Yeah, it´s quite popular, especially when you live in the southern parts of Slovakia :cool:

Nikon D90 + Nikkor f/2,8D macro 1:1 (amazing lens , focal lenght is multiplied by 1,5x so what I see is 90mm, that´s just right for this type of macro photography, it´s also really sharp lens, I bought it in B&H photo used for not very much)+ macro ring LED flash I purchased on ebay for 40 euros. :)




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[*] posted on 23-2-2014 at 00:03


Quote: Originally posted by Brain&Force  
kristofvagyok: I have a new wallpaper now, thanks!
Hegi: Your crystals remind me of copper acetate crystals. What's the scale on the photos?

Are you two twins separated at birth? Your photos say it all!


It´s chrome alum, but would be nice to grow some copper acetate crystals and take a photo too. From left to right you see 1 cm, so the crystals are about 1-2mm . :)

Maybe we are, who knows...




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Mailinmypocket
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[*] posted on 23-2-2014 at 07:53


A quartz short wave UV tube. One picture shows the mercury mirror and droplets inside the tube. On the other is the tube while operating. No worries, eye protection was used.

image.jpg - 76kB image.jpg - 63kB
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sargent1015
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[*] posted on 23-2-2014 at 17:34


Quote: Originally posted by Oscilllator  
Some copper aspirinate I made the other day. Also, an improvised dean-stark trap. It worked just fine for my synth of p-toluenesulfonic acid.


I see copper aspirinate and it makes me tingle! By far my favorite complex I have made at home :D




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Zyklon-A
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[*] posted on 24-2-2014 at 08:54


I have recrystallized potassium nitrate a few times tying to get as long/big of crystals as possible. Here is my most recent attempt: PICT0114.jpg - 159kB
The biggest crystal that I found is 75mm long and weighs 3.7 grams. (Sadly, the big crystal broke in half before I could take a picture....)
[EDIT] Rearranged picture.

[Edited on 24-2-2014 by Zyklonb]




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Oscilllator
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[*] posted on 25-2-2014 at 01:07


Quote: Originally posted by Zyklonb  
I have recrystallized potassium nitrate a few times tying to get as long/big of crystals as possible. Here is my most recent attempt:
The biggest crystal that I found is 75mm long and weighs 3.7 grams. (Sadly, the big crystal broke in half before I could take a picture....)
[EDIT] Rearranged picture.

[Edited on 24-2-2014 by Zyklonb]

Nice! Here's some pictures of my own KNO3 recrystallisations, from a failed synth of KNO2:


IMG_20130803_141450.jpg - 198kBIMG_20130803_155443.jpg - 107kB




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Zyklon-A
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[*] posted on 25-2-2014 at 06:58


Your crystals look a little better than mine. The way I did it, was I put the test tube in about 2 liters of almost boiling water, and allowed them to sit there overnight. I'm not sure how long it took for all the water to reach room temperature, but I think at least a few hours. The next morning, I put it in the freezer for about 30 minutes to get as much as possible.
How did you do it?




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[*] posted on 27-2-2014 at 22:01


I just let it sit at room temperature, since I wasn't trying to get particularly big crystals. The probable reason your crystals didn't turn out quite as well is because you put them in the freezer. I find recrystallizing solutions in the freezer to universally result in small crystals.
Other possible reasons include:
-your test tube was particularly dirty, resulting in multiple nucleation points.
-You used a test tube. Perhaps a wider vessel like a beaker/erlenmeyer would work better.
-Your solution was to concentrated.
-The fact that my solution also contained potassium nitrite. I don't know how this could affect it, but its a possibility.




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[*] posted on 1-3-2014 at 18:04


Experimenting with growing aluminum oxide "beards". Apparently they can grow quite long if left undisturbed

image.jpg - 53kB
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Brain&Force
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[*] posted on 3-3-2014 at 16:07


How do you grow them? If I'm not mistaken they can be generated by dissolving aluminum in mercury and allowing it to oxidize.



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[*] posted on 4-3-2014 at 13:01


Simply putting mercury in contact with aluminum starts it. However the protective oxide coating is the issue. So I placed a bit of mercury under some 15% HCl, held the aluminum in the acid until it started to bubble and then pressed it into the mercury while in the acid. A shiny mirror of Hg sticks to the metal after maybe 15 seconds. Then take it out, rinse it off and hang it undisturbed. The beards grow in a matter of minutes. I plan to do it better next time, this was just a quick test to see how well it worked.
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Organikum
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[*] posted on 7-3-2014 at 10:16


Strange looks but it did what it was supposed to do.




strange1.JPG - 158kB
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[*] posted on 8-3-2014 at 02:22


My first caffeine extraction. 10 mg is pretty pathetic haha, but at least I've done it now :D




The original tea extract:


Screen Shot 2014-03-08 at 9.07.48 pm.png - 335kB
My sample.
Screen Shot 2014-03-08 at 9.04.43 pm.png - 300kB




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Zyklon-A
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[*] posted on 8-3-2014 at 08:45


My first caffeine extraction:
PICT00043.jpg - 107kB



Hehe, just kidding. ;)
It is pure caffeine powder though, I just bought it. (~100 grams,) I couldn't resist. That's a lot of caffeine.


[Edited on 8-3-2014 by Zyklonb]




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[*] posted on 8-3-2014 at 17:54


Very nice. Personally, it feel better if you extract it, like you've earned it. If you have some DCM, give it a go: http://employees.oneonta.edu/knauerbr/chem226/226expts/226_e... I didn't bother to precipitate the caffeine like at the end though, i just put the organic layer into a 4-dram vial and boiled off the solvent outside and put in to a desiccator bag. Also, make sure not to let any of the tea leaves out because filtering this solution was impossible, even with vacuum it took 5 minutes to get about 5 drops through. be careful as DCM is nasty.

[Edited on 9-3-2014 by HeYBrO]

[Edited on 9-3-2014 by HeYBrO]




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[*] posted on 9-3-2014 at 18:51


Here's some little balls of sulfur that I made from melting some sulfur chunks and pouring it into water. Really simple, but I think they look really cool.

IMG_0018.jpg - 138kB
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kristofvagyok
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[*] posted on 12-3-2014 at 14:13




Yellow fluorescent orb.

A byproduct of a reaction (salicylaldoxime) crystallized on the wall of a flask and emitted this nice yellow color when exposed to UV light.




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[*] posted on 13-3-2014 at 12:12


Kristof, what sort of research do you do? It seems like you get to perform an extremely wide variety of interesting reactions! Gorgeous photo, as always.
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kristofvagyok
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[*] posted on 16-3-2014 at 15:37


Quote: Originally posted by MrHomeScientist  
Kristof, what sort of research do you do?

Every kind. We are developing new reagents for organic synthesis, often prepare compounds for other research groups, prepare compounds on new ways, optimalizing these methods, finding out reaction mechanism. So we do a lot things, usually on multigram scale.




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[*] posted on 17-3-2014 at 12:09


<img src="http://chem.pieceofscience.com/wp-content/uploads/2014/03/vanadinite1.jpg" alt="Smiley face" height="1200" width="800">

<center>
Click here for more pics of minerals </center>




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[*] posted on 17-3-2014 at 12:11


Is that a mineral, or an oddly-shaped piece of chocolate?



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[*] posted on 17-3-2014 at 12:23


Ha! I thought the same thing, chocolate crystals! What is it? It's beautiful.
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