/sci/ - Science & Math » Thread #12608277

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Crystals man

Anonymous Thu 21 Jan 05:33:35 2021 No.12608277 View Reply Original Report

Quoted By: >>12608380 >>12608562 >>12609727 >>12615864

Doing my Master's thesis on crystal growth. Anyone know of any good prof's I can poke the brain of for some insight.

Anonymous

Anonymous Thu 21 Jan 2021 06:27:35 No.12608380 Report

Quoted By:

>>12608277
What kind of crystals?

Anonymous

Anonymous Thu 21 Jan 2021 07:45:41 No.12608562 Report

Quoted By:

>>12608277
what literature are you reading? I'm studying this subject too

Anonymous

Anonymous Thu 21 Jan 2021 17:15:05 No.12609727 Report

Quoted By:

>>12608277
Professor Crystal

Anonymous

Anonymous Thu 21 Jan 2021 17:42:40 No.12609792 Report

Quoted By: >>12610086

Guys halp, I need to grow a single crystal for XRD

Any tips

Anonymous

Anonymous Thu 21 Jan 2021 18:52:15 No.12610086 Report

Quoted By: >>12610654

>>12609792
what kind of crystals?

Anonymous

Anonymous Thu 21 Jan 2021 21:38:47 No.12610654 Report

Quoted By: >>12615769 >>12615922

>>12610086
Sphingolipids and aliphatic aldehydes

Anonymous

Anonymous Thu 21 Jan 2021 21:49:36 No.12610692 Report

Quoted By: >>12610752 >>12612307

OP here.

It's the weird stuff that happens when you let a solution of inorganic (e.g. CuSO4) dry out. It's not the ordered, regular crystals that we see in their various prismatic forms, but the random, fractal patterns that form elsewhere. He's studying it, calling it "plasmonics" due to how it wanders.
For example, the "crystals" will end up climbing up and out of the beaker if left long enough. He's studying that right there.
XRD has shown them to have the same structure as traditional crystals, but he's convinced of it and he's my PI, so I do as he wishes. He may be a rambling madman, but his ramblings are at least interesting.

Anonymous

Anonymous Thu 21 Jan 2021 22:04:48 No.12610752 Report

Quoted By: >>12612263

>>12610692
>XRD has shown them to have the same structure as traditional crystals
So then what makes them different? A difference in nucleation maybe?

Anonymous

Anonymous Fri 22 Jan 2021 05:27:55 No.12612263 Report

Quoted By: >>12612352

>>12610752
mayhaps? Their characteristics are different. Adhere STRONGLY to the glass, like as if they were super glued on. We've also noticed that it has a threshold between redox reactions vs crystallizing out. At low concentrations, it performs redox until it reaches a certain conc. as it dries out and then crystallizes. Higher concentrations simply crystallize straight out and don't do redox.
Also, the crystals separate themselves based on oxidation states. CuSO4 with an Iron rod in it will segregate into Cu(I) and Cu(II) layers.

Anonymous

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Anonymous Fri 22 Jan 2021 05:46:45 No.12612307 Report

Quoted By: >>12613688 >>12615939

>>12610692
>For example, the "crystals" will end up climbing up and out of the beaker if left long enough
Neat, I've got some K2HPO4 doing that right now. Do you know why it happens or what causes it? Are they "climbing" via capillary action?

Anonymous

Anonymous Fri 22 Jan 2021 06:08:14 No.12612352 Report

Quoted By: >>12613688

>>12612263
Maybe you should check to see if you aren't getting nanoparticles or nanocrystals forming. Run UV-Vis or SEM. Just a thought.

Anonymous

Anonymous Fri 22 Jan 2021 14:48:57 No.12613688 Report

Quoted By: >>12614383 >>12615984

>>12612307
precisely, I thought it was just capillary action too, but the solvent surely can't carry itself through the crystalline matrix, my PI says.

>>12612352
Our SEM is broke currently, would it be like a UV-Vis solid spectra, or did you mean to re-dissolve it and then run UV-Vis?

Anonymous

Anonymous Fri 22 Jan 2021 17:43:11 No.12614383 Report

Quoted By:

>>12613688
>would it be like a UV-Vis solid spectra, or did you mean to re-dissolve it and then run UV-Vis?
Just do your normal procedure and when your ready to let it crystalize take a liquid sample to see if your making nanparticles during your synthesis. Try low concentrations first.

Anonymous

Anonymous Fri 22 Jan 2021 23:13:41 No.12615769 Report

Quoted By: >>12615922

>>12610654
Pls halp, can't grow shit from ethyl acetate

Anonymous

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Anonymous Fri 22 Jan 2021 23:43:09 No.12615864 Report

Quoted By:

>>12608277
The Czochralski method, named after the most cited Polish scholar, would help you immensely.

Anonymous

Anonymous Sat 23 Jan 2021 00:04:45 No.12615922 Report

Quoted By:

>>12610654
>>12615769
Have you tried chloroform/methanol solution?

Anonymous

Anonymous Sat 23 Jan 2021 00:12:48 No.12615939 Report

Quoted By: >>12615984 >>12616028

>>12612307
ignorant anon here, wouldn't it be more a surface tension of the fluid 'climbing' over the existing structure as the matrix is already solid?

Anonymous

Anonymous Sat 23 Jan 2021 00:23:40 No.12615984 Report

Quoted By: >>12615988 >>12616028

>>12615939
see >>12613688
His PI says that is not the effect.

Anonymous

Anonymous Sat 23 Jan 2021 00:25:22 No.12615988 Report

Quoted By: >>12615991 >>12616015 >>12616028

>>12615984
oh that's what you mean by capillary, so what is the mechanism?

Anonymous

Anonymous Sat 23 Jan 2021 00:26:45 No.12615991 Report

Quoted By:

>>12615988
that's what he is trying to figure out lol

Anonymous

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Anonymous Sat 23 Jan 2021 00:35:42 No.12616015 Report

Quoted By:

>>12615988
okay dammit now I need to read up, I've never actually given the mechanism any thought heheh

Anonymous

Anonymous Sat 23 Jan 2021 00:40:11 No.12616028 Report

Quoted By: >>12616033

>>12615939
>>12615984
>>12615988
OP here. I mean, he could be wrong. Just cause he's my PI, don't mean he's inculpable.

Anonymous

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Anonymous Sat 23 Jan 2021 00:42:28 No.12616033 Report

Quoted By:

>>12616028
true hehe

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