Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
 Pages:  1  ..  5    7
Author: Subject: Crystal Growing
Endo
Hazard to Others
***




Posts: 105
Registered: 5-1-2006
Location: USA
Member Is Offline

Mood: Cold

[*] posted on 5-2-2011 at 11:34


@ Peach

Thanks a ton for the ideas, after talking it over with her and indicating how little time we have left she decided that she likes the anhydrous vs hydrated salts demonstration. We will go this route as it is much easier with the time we have left. Thanks
View user's profile View All Posts By User
peach
Bon Vivant
*****




Posts: 1428
Registered: 14-11-2008
Member Is Offline

Mood: No Mood

[*] posted on 5-2-2011 at 16:56


Erm... yeah... there is a price on that information.

I want to see the project. :D :P




View user's profile View All Posts By User
Arthur Dent
International Hazard
*****




Posts: 541
Registered: 22-10-2010
Member Is Offline

Mood: entropic

[*] posted on 3-3-2011 at 05:03


Deleted text because of replied post removed... ;)

Robert


[Edited on 3-3-2011 by Arthur Dent]




--- Art is making something out of nothing and selling it. - Frank Zappa ---
View user's profile View All Posts By User
Elawr
Hazard to Others
***




Posts: 174
Registered: 4-6-2006
Location: Alabama
Member Is Offline

Mood: vitriolic

[*] posted on 3-3-2011 at 07:31


I've enjoyed some success at growing FeS04*5H20 by keeping my supersaturated solution acidified by adding a little H2S04, sealing the container, and keeping few common iron nails (NOT galvanized) in the liquor while crystals grow. The solution will remain clear, and nice green crystals will emerge.

I suspect it is the Fe(III) state that muddies things up, and that the presence of elemental iron and excess (SO4)= in the solution strongly favors Fe(II) instead.

[Edited on 3-3-2011 by Elawr]




1
View user's profile View All Posts By User
Morgan
International Hazard
*****




Posts: 1402
Registered: 28-12-2010
Member Is Offline

Mood: No Mood

[*] posted on 3-3-2011 at 08:00


Tidbit on potassium dihydrogen phosphate
National Ignition Facility shorts
http://www.youtube.com/watch?v=hMRD2Ckmmes
View user's profile View All Posts By User
hissingnoise
International Hazard
*****




Posts: 3923
Registered: 26-12-2002
Member Is Offline

Mood: Pulverulescent!

[*] posted on 3-3-2011 at 08:16


I once read an article somewhere where German researchers grew very large crystals of HMTD.
They found that, at a certain particular size, the crystals detonated entirely spontaneously, due presumably, to lattice-strain!

View user's profile View All Posts By User
Morgan
International Hazard
*****




Posts: 1402
Registered: 28-12-2010
Member Is Offline

Mood: No Mood

[*] posted on 3-3-2011 at 10:08


A long time ago I remember reading a book on growing crystals and one I thought interesting was growing Rochelle salt I think. After you had your large crystal it said to take a bit of vaseline to cause two aluminum foil strips to stick to the sides of the crystal. Wires were connected to the foil. Then a thin piece of cardboard was placed on top of the crystal. You then got your friend to hold the wires while you strike/rap the crystal with a hammer, shocking your friend, all in the name of science of course. ha
View user's profile View All Posts By User
aonomus
National Hazard
****




Posts: 361
Registered: 18-10-2009
Location: Toronto, Canada
Member Is Offline

Mood: Refluxing

[*] posted on 3-3-2011 at 14:15


Quote: Originally posted by hissingnoise  
I once read an article somewhere where German researchers grew very large crystals of HMTD.
They found that, at a certain particular size, the crystals detonated entirely spontaneously, due presumably, to lattice-strain!



I wonder how many crystal growing apparatus setups they destroyed. It always seems to be the Germans in Angewandte Chemie that are making molecules with more nitrogen than carbon....

As for the rochelle salt, I think the fact that it is an easily accessible piezoelectric crystal is great.
View user's profile Visit user's homepage View All Posts By User
slinky
Harmless
*




Posts: 39
Registered: 14-9-2010
Member Is Offline

Mood: No Mood

[*] posted on 10-3-2011 at 13:00


Bismuth crystals look amazing. They look almost alien, something hr gieger would appreciate. Here's some how to guides.

http://www.amazingrust.com/experiments/how_to/Bismuth_Crysta...
http://www.autarchex.com/projects/growing_bismuth_crystals

<img src="http://www.sciencemadness.org/scipics/Bismuth.jpg" width="800" />

<!-- bfesser_edit_tag -->[<a href="u2u.php?action=send&username=bfesser">bfesser</a>: reduced image size(s)]

[Edited on 10.12.13 by bfesser]
View user's profile View All Posts By User
Poppy
National Hazard
****




Posts: 294
Registered: 3-11-2011
Member Is Offline

Mood: † chemical zombie

[*] posted on 8-2-2012 at 08:00


Quote: Originally posted by Sedit  
Quote: Originally posted by chemoleo  
Same here - I was hugely disappointed with ferrous ammonium sulfate - not only is the colour ugly, but also it's prone to oxidation. But I didn't have much good experience with FeSO4 hydrate either... the iron curse!


I know this is a rather old post but how did you attept to make the FeSO4 crystals chemoleo? I boil iron(steel?) in H2SO4 before which left me with a grey material IIRC which turned green with the addition of H2O. The green solution was filtered and left overnight in a jar where Large FeSO4 crystals grew all over the bottom with some rather large almost 1 ince in size. If left out oxidation is a huge problem and the "crystals" turn earth tone red. The solution also began to form brown precipitate until the Green color was completely gone. I think the trick is to start with as concentrated solution as possible and cap it ASAP and allow it to grow or else it will just form brown shit.


Surely when making ferrous sulfate out of cast iron you got to filter the carbon content of the iron first, thus leaving a cyan-green solution, which must be kept acidic and away from daylight to prevent iron II from oxydizing into iron III which is brown and much more insoluble. I have a guess those hexa or heptahydrate salts must be much more difficult to grow than conventional crystal lattices that excludes water from them. They're beautiful but troublesome
View user's profile View All Posts By User
GreenD
International Hazard
*****




Posts: 615
Registered: 30-3-2011
Member Is Offline

Mood: Totally f***ing high, man!

[*] posted on 8-2-2012 at 10:30


you guys ever see this cave in russia?

http://www.stormchaser.ca/caves/naica/Naica_08.jpg
View user's profile View All Posts By User
quicksilver
International Hazard
*****




Posts: 1820
Registered: 7-9-2005
Location: Inches from the keyboard....
Member Is Offline

Mood: ~-=SWINGS=-~

[*] posted on 8-2-2012 at 10:42


Pushing 2cm of TNT crystal growth:
http://www.sciencemadness.org/talk/viewthread.php?tid=29&...
Unfortunately there is nothing to compare a table of length but the beaker on the rt (TNT) had some amazingly long needles.


EDIT:
Do you have any more information on that Russian cave? That's incredible!

[Edited on 8-2-2012 by quicksilver]




View user's profile View All Posts By User
Poppy
National Hazard
****




Posts: 294
Registered: 3-11-2011
Member Is Offline

Mood: † chemical zombie

[*] posted on 8-2-2012 at 12:27


They pushed that too far.. too far... Crystals won't fit the cave exit anymore. Hopefully may us all grow crystals like these someday?

Now seriously guys, I've been so "seriously" trying to grow ammonium dihydrogen phosphate crystals with just a beaker and a bain marie pan at best. The result is that the crystals grow but the tiny parasitic crystals growing on them seem to disturb the whole process because they excuselessly off spring in the beaker walls so the shot there might work is that the iny crystals grow over the seeds and get recombined by ion exchange forces. This realy happens when powder turns into crystals when wet and at rest. If this don not proceed the seed must be suspended with latex fishing string, or just any very fine nylon string, in the solution and then create a miniramp where the recently formed zit crystals may slide off to the bottom leaving this suspended seed at least untouchable, if not at a good growing rate.
I shall give results soon enough.
View user's profile View All Posts By User
turd
International Hazard
*****




Posts: 800
Registered: 5-3-2006
Member Is Offline

Mood: No Mood

[*] posted on 8-2-2012 at 12:38


Quote: Originally posted by GreenD  
you guys ever see this cave in russia?

http://www.stormchaser.ca/caves/naica/Naica_08.jpg

Mexico! It was all over the news a few years ago:
https://en.wikipedia.org/wiki/Cave_of_the_Crystals
View user's profile View All Posts By User
Magpie
lab constructor
*****




Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline

Mood: Chemistry: the subtle science.

[*] posted on 8-2-2012 at 12:39


Quote: Originally posted by GreenD  
you guys ever see this cave in russia?

http://www.stormchaser.ca/caves/naica/Naica_08.jpg


Those crystals look amazingly like the CaSO4*2H20 crystals found in a cave in Mexico. See the post by chemoleo, this thread.

http://www.sciencemadness.org/talk/viewthread.php?tid=5529&a...




The single most important condition for a successful synthesis is good mixing - Nicodem
View user's profile View All Posts By User
plante1999
International Hazard
*****




Posts: 1937
Registered: 27-12-2010
Member Is Offline

Mood: Mad as a hatter

[*] posted on 7-4-2013 at 07:48


I would like to know if anyone know how to grow malachite, such as the one in this paper.

Thanks!

Attachment: Man-Made-Jewelry-Malachite.pdf (392kB)
This file has been downloaded 828 times





I never asked for this.
View user's profile View All Posts By User
Morgan
International Hazard
*****




Posts: 1402
Registered: 28-12-2010
Member Is Offline

Mood: No Mood

[*] posted on 1-12-2013 at 13:44


If this hasn't been posted, there are lots of pretty quartz crystals and some history and science behind them.
Russian Synthetic Quartz
http://www.youtube.com/watch?v=PKQOSPwodWY
View user's profile View All Posts By User
cpman
Harmless
*




Posts: 36
Registered: 9-12-2013
Location: Austin, TX
Member Is Offline

Mood: No Mood

[*] posted on 9-12-2013 at 22:30


Currently, I'm growing single crystals of monoammonium phosphate (NH4H2PO4), copper II acetate [Cu(CH3COO)2], and potassium alum. Also, I'm dissolving some zinc in vinegar to make zinc acetate for crystal growing.
The monoammonium phosphate is really annoying, as every single crystal I try to grow turns cloudy because the temperature of my house is not super stable, and I tend to make the solutions when the house is at its warmest. The others are fairly easy.

[Edited on 12-10-2013 by cpman]
View user's profile View All Posts By User
blogfast25
Thought-provoking Teacher
*****




Posts: 10334
Registered: 3-2-2008
Location: Old Blighty
Member Is Offline

Mood: No Mood

[*] posted on 10-12-2013 at 05:59


NH4H2PO4



View user's profile Visit user's homepage View All Posts By User
Zephyr
National Hazard
****




Posts: 326
Registered: 30-8-2013
Location: Seattle, WA
Member Is Offline

Mood: I am pinkhippo11 on reddit.

[*] posted on 10-12-2013 at 19:40


Some almost finished stannous chloride crystals.






Sciencemadness Patches for sale! U2U me if you are interested.
http://imgur.com/a/QmpHn http://www.sciencemadness.org/talk/viewthread.php?tid=62566&...
View user's profile View All Posts By User
Oggas
Harmless
*




Posts: 8
Registered: 10-5-2011
Member Is Offline

Mood: No Mood

[*] posted on 18-12-2014 at 14:38
Crystallization chamber


Quote: Originally posted by aonomus  
Thats interesting that 5-10% NaOH causes the NaCl to saturate. I'll have to try that this week.

I'm also in the process of building a crystallization chamber based on the rotating platform setup the LNL used to grow massive KDP crystals for their big lasers.

http://education.llnl.gov/crystals/Sketch.html

[Edited on 25-7-2010 by aonomus]


Anonomus I was wondering how the building of the crystallization chamber was going? It seems I can't view the reference you are quoting so I'd love any info on how you did it. Been having trouble finding good references on how to build one.

Anyone else got any ideas?
View user's profile View All Posts By User
Sniffity
Hazard to Self
**




Posts: 70
Registered: 27-12-2014
Member Is Offline

Mood: No Mood

[*] posted on 27-12-2014 at 01:35


I also tend to use the seed crystal on a string method for growing large crystals. I get annoyed to no end by the string being unremovable after this D:

I've tried planting a single seed crystal on the floor of the beaker, but invariably more crystals will form (I'm guessing due to seeding by impurities) which will eventually trap my big crystal on the bottom.

Any ideas on getting a large crystal without the use of a string?
View user's profile View All Posts By User
Bezaleel
National Hazard
****




Posts: 285
Registered: 28-2-2009
Member Is Offline

Mood: equilibrium

[*] posted on 6-1-2015 at 10:59


The only - really sophisticated - method I can think of (only works for diamagnetic crystals) is by suspending the crystal in a magnetic field. This requires extremely strong magnetic fields.

Practically we're limited to less sophisticated methods. I've always grown my crystals on monofilament threads. Seed crystals I took form the bottom of my beakers/flasks.

The only practical general method (I know of) for "suspending" a crystal without the use of wires is by an upward flow of the mother liquor. Requires cunning tuning of the liquid flow.... And I imagine is to be very difficult to prevent the saturated solution from forming crystals inside your pump.
View user's profile View All Posts By User
soniccd123
Harmless
*




Posts: 10
Registered: 20-1-2014
Location: Brazil
Member Is Offline

Mood: No Mood

[*] posted on 22-1-2015 at 21:09


Quote: Originally posted by Sniffity  
I also tend to use the seed crystal on a string method for growing large crystals. I get annoyed to no end by the string being unremovable after this D:

I've tried planting a single seed crystal on the floor of the beaker, but invariably more crystals will form (I'm guessing due to seeding by impurities) which will eventually trap my big crystal on the bottom.

Any ideas on getting a large crystal without the use of a string?


I got a pretty big Copper Sulfate crystal once using a seed on the floor of the vessel, with time, more crystals really formed, but every time this happened, i just took the crystal i was growing out and filtered the solution.I kept doing this till i was happy with the size of the crystal.

I tried this with Iron(II) Sulfate and Cobalt(II) Sulfate and the first one worked like charm but with Cobalt, on the other hand, i could grow the crystal only till it got like 5mm, then it started to get quite hazy (in fact, i still don't know how to grow a big Cobalt Sulfate crystal, they all get very hazy and strange when bigger than 5mm more or less).
View user's profile View All Posts By User
 Pages:  1  ..  5    7

  Go To Top