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Author: Subject: Pretty Pictures (2)
Tsjerk
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[*] posted on 20-4-2018 at 14:10


Oops, I was confused and was thinking of salicylic acid, which could be made by hydrolysis of aspirin.
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j_sum1
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[*] posted on 20-4-2018 at 21:36


Mixed chromium(III) waste in the bottom of a 1L beaker. It is deliquescent and has taken on a really glossy sheen.

2018-04-21 09.42.43.jpg - 1MB




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HeYBrO
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[*] posted on 21-4-2018 at 01:31


Quote: Originally posted by Hegi  
Quote: Originally posted by Tsjerk  
Not exactly salen, but close enough and with very OTC chemicals!

http://www.asianjournalofchemistry.co.in/User/ViewFreeArticl...


I see yes, thiourea is cheap but what about salicylaldehyde, where can I get it? Any idea?


Aspirin-->salicylic acid-->phenol

With phenol you can perform a Reimer-Tiemann reaction to get salicaldehyde. But I must admit, I don't know if anyone has actually done it on SM. But all the reagents are OTC or can be made from OTC reagents.
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Flagmat
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[*] posted on 26-4-2018 at 05:12


Milk and soap

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Supersonic
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[*] posted on 28-4-2018 at 11:27
Formates crystals


Quote: Originally posted by Hegi  
Quote: Originally posted by Supersonic  
Quote: Originally posted by Amos  
Copper(II) formate crystals. Their supernatant is the deepest of royal blues and yet the crystals are an icy-looking aqua color.


Large crystals have a nice form and beautiful color.
It`s a pity that they erodes even in warm air.

There crystals were synthesed from copper(II) hydroxide and formic acid.





Those are really beuatiful copper formate crystals. Especially, the second one is really big and it seems to be nicely shaped. What technique did you use to grow it? I tried once but there was a problem with hydrolysis mostly and even in acidic environment the salt did not want to crystallize easily. :)


These crystals were grown with slow evaporation method during about 2-2.5 months. I`ve just put acidic solution into the plastic glassful and voila :)

It`s a pity that crystals slowly erodes in open air. I tried to save it in packet with zip lock, but after few months it was fully eroded and crumbled.


I also tried some other formates. For example, crystals of calcium formate:

IMG_20160805_201833.jpg - 2.7MB
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Texium (zts16)
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[*] posted on 7-5-2018 at 11:02


Crystals of sulfanilic acid that I prepared recently:

Sulfanilic_acid.JPG - 1.7MB

The light purple coloration is not inherent to the compound, but due to traces of polyanilines.




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weilawei
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[*] posted on 8-5-2018 at 10:03


Distillation of bromine from NaBr, TCCA, and HCl.

20180429_191725.jpg - 1.8MB
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The Volatile Chemist
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[*] posted on 10-5-2018 at 13:05


A very pretty picture, looks like fun. I appreciate the nice combination of a good nature and chemistry photo.



My write-ups are on here...
http://www.MeltThe.Ga or http://ptp.x10.mx
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Boffis
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[*] posted on 17-5-2018 at 07:50


@ Supersonic, have you tried strontium formate? I believe the crystals are the dihydrate but they grow into large well formed blocky prisms. I can remember growing them years ago.
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Supersonic
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[*] posted on 19-5-2018 at 01:53


@Boffis

Yes, I've grown few crystals of strontium formate. They have beautiful prismatic shape:
IMG_20170122_183421.jpg - 1.3MB IMG_20180311_194623.jpg - 787kB
But it is hard to grow large monocrystal because of low solubility.

For me, it is more pleasant to grow strontium acetate, which mainly forms monocrystals and have arrow-like shape:
IMG_20170207_143625.jpg - 1.7MB
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[*] posted on 19-5-2018 at 02:48


I could do strontium acetate. I might have to try that.



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[*] posted on 21-5-2018 at 09:03




Some cesium copper chloride crystals

I first found out about cesium tetrachlorocuprate from this site when I was looking for a yellow compound for my collection of copper compounds (posted earlier in this thread), at the time I didn't consider it as a candidate for crystallization.

Later, when I was looking for a new, interesting materials to grow crystals from, I decided to check if it would crystallize, and found a paper which said it would form yellow-orange crystals.

The compound doesn't contain water of crystallization, and seems to be air stable. It is also a very unusual color for a copper compound; dichromate-like orange.
My first attempt produced nice, orange crystals, but later attempts also resulted in darker, brownish crystals of unknown composition forming. These crystals turned more reddish and lost their transparency completely over time.
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[*] posted on 23-5-2018 at 08:51


pH paper I got after filtering anthocyanins extract from roses. I just let it dry out and cut into stripes.
It's strong acid on the top then weak acid, weak base, strong base and the bottom is neutral.

IMG_20180523_174216.jpg - 2.1MB




Elements collected:31/92
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[*] posted on 23-5-2018 at 09:28


Resublimed iodine crystals.

jod.jpg - 423kB




Elements collected:31/92
Last acquired: Co
Check out the ScienceMadness Wiki: http://www.sciencemadness.org/smwiki/index.php/Main_Page
Also make sure to check out my and hegi's website :) :
http://pieceofscience.com
Thanks.
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[*] posted on 18-6-2018 at 03:59


Quote: Originally posted by crystal grower  
First crystal of my CoSO4 solution prepared from CoCl2 + Na2CO3, then CoCO3 + H2SO4.
I'll try to make prettier crystals when the solution is all evaporated.


Cobalt salts make some very aesthetically pleasing crystals. I've got a mess of similar crystals inside a vial of Co(NO3)2 saturated solution due to partial evaporation.
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[*] posted on 22-6-2018 at 03:20


Quote: Originally posted by The Plutonium Bunny  
Recently, I've been really interested in crystals of pure metals, mostly for my element collection. After being inspired by The Backyard Scientist's video (see his post on page 23 of this thread), I decided to grow some of my own copper crystals. Over a period of six weeks, I used a 40g/L solution of copper sulfate and two copper electrodes with a current of always less than 10mA to grow some truly amazing copper crystal clusters. Unlike nearly all the other experiments I saw online, these crystals are very large and sharply defined - they are not nodules or rounded growths. I think that the extremely low current and the very long growth time contributes to the crystalline nature of this growth.

I made a YouTube video about how I grew this, and I also included a 360° rotation to show the entire crystal. https://www.youtube.com/watch?v=zZniOJ7swic

Also, for those who might like to repeat this experiment (the crystal is truly stunning), I wrote an extensive post on my website with details on the experiment. http://sciencewithscreens.blogspot.com/2016/06/experiment-53-growing-large-copper.html This post also has a link to my experimental data and observations I recorded during the six-week period.

Finally, I also included the less-impressive picture of my first attempt. This used currents of around 20mA over two weeks, and I accidentally broke the crystal. It's still pretty neat, though.

In the future, I will be trying other metals. Does anyone have experience with growing crystals of other metals? Thank you!


I like those crystals so much that I decided to make some of my own. And on the cheap. I repurposed a plastic take-out food container (that originally had chicken tikka masala in it, thoroughly cleaned) and filled it almost to the top with CuSO4 80g/l (40g in 500ml solution, with dH2O) and a pinch of sea salt. Electrodes made from 14 gauge copper wire (1.6mm) about 1m of it for the anode, short length for cathode. For the constant current source I decided to go as simple as possible: a 5V wallwart, and a JFET+resistor. Essentially this (not my drawing):



Randomly chosen JFET from a big pile of them, measured IDSS=22mA; used a 150ohm resistor which resulted in 9.6mA constant current, perfect.

Will check again on it in a month or so.
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[*] posted on 22-6-2018 at 23:42


Stamasd:

I thought constant current would tended to favour dendritic growth as the high points closer to the counter electrode hog the limited current and hence grow faster. In addition its probably a function of the resistance of the solution (its concentration) and the distance to the counter electrode relative to the height of crystal growth.




Borosilicate glass:
Good temperature resistance and good thermal shock resistance but finite.
For normal, standard service typically 200-230°C, for short-term (minutes) service max 400°C
Maximum thermal shock resistance is 160°C
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[*] posted on 23-6-2018 at 03:02


We shall see. The author of the post I quoted (from 2 years ago) has had nice results with a similar setup. The electrolyte is quite concentrated and has a low resistance (on the order of 0.5ohms) and the distance between anode and cathode is fairly large compared to the exposed surface of the cathode (8cm vs 0.5cm) so I hope that the variations in current density at the cathode will be minor enough to not make a difference.

Again we shall see. It's an experiment; if it doesn't work I will try to change its conditions for the next time until it does. :)

Edit: here's what the cathode looks like after 2 days.

[Edited on 23-6-2018 by stamasd]

20180623_144104.jpg - 2MB
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mayko
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[*] posted on 6-7-2018 at 17:53







Uranium concentrates from various mines (mostly on and about the Colorado Plateau)

(ed: ?? has tweet embedding turned off ??)

[Edited on 7-7-2018 by mayko]




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