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Author: Subject: Homemade and Repurposed Lab Gear
Ubya
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if you drill 2 holes on the side, one on top and one on the bottom, you can glue 2 pieces of tubing (or if it's borosilicate you could even try welding two glass tubes) and make a water jacketed beaker

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j_sum1

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Mood: Metastable, and that's good enough.

I think it is borosilicate. It is at least designed to handle the thermal stress of boiling water.
But I break glass easily enough without trying to modify it. I doubt I would make any useful progress with that process.

Anyway, I have seen jacketed beakers as you describe on ebay for not too much. But I think I have more use for a substitute dewar. Who knows. I might even find some applications for the strainer and the screw lid
Eisenpanzer432
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My new lattice support, almost finished but in working condition now. The t square for size reference is 48”.

DavidJR
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Very nice! I've been thinking of building something like that. The commercial lab lattice kits with the connectors etc just seem ridiculously overpriced.

Are you planning on attaching it to the wall/work surface?

[Edited on 8-11-2018 by DavidJR]
Ubya
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has anyone ever used this kind of quartz tubing (from oven heating elements) as a normal transparent quartz tubing?
like to hold catalysts or as a combustion tube

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andy1988
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FoodSaver Jar Sealer to extend shelf life of things (vacuum storage in mason jars at ~20-30mbar)

Using water aspirator:

With mason jars and ~$9 FoodSaver Jar Sealer (perhaps other products exist, but nothing else on shelves in U.S.). Also 5mm OD vinyl tubing, I use next size up & beeswax to fit to aspirator, don't buy the FoodSaver's overpriced tubing as generic tubing fits perfectly... They market it with their$60+ machines as the vacuum source... but I'm guessing aspirator has better vacuum (vapor pressure of cold water).

Will reduce oxidation problems like with FeSO4, and reduce moisture problems with things like potassium iodide (LOUDWOLF brand bottle pictured in mason jar with rice as desiccant) and alginate (pink powder in picture). Extends shelf life of such things!

I buy big 5lb bag of roasted coffee beans and vacuum seal in many jars, keeps the oil from oxidizing (keeps it fresh!). Also I seal many of my "nootropic" powders this way, like trimethylglycine [1][2]. Searching literature/google for "XYZ stability" would help me find if this procedure is useful for the substance in question.

Note: Gasket on mason jar lid seem to have shelf life differing between brands, I have a bunch laying around, hard and soft, the hard ones won't hold vacuum (i.e. if the gasket hardens in a number of years you'll loose vacuum, lid will pop up indicating as such).

Procedure: Put lid in device and device on jar. Blue rubber holds lid up so that air can be sucked out. Blue rubber must touch glass "flange" below threads to seal (may have to push if flange large, or remove bottom plastic ring). If jar has no flange below threads or flange too large, I think you could use wax to temporarily seal threads. Let vacuum for a minute, pull vinyl tubing from device (not device from jar), it'll "pop" as rush of incoming air pushes lid down, pull device off and verify sealed.

EDIT: I suppose you could also do a dry nitrogen purge first (or other appropriate gas if you have) to try to replace all oxygen & moisture before pulling the vacuum.

[Edited on 12-12-2018 by andy1988]
Sulaiman
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 Quote: Originally posted by CobaltChloride Through the hole I put a roll made out of sterile compresses.

These fibreglass wicks are excellent. https://www.ebay.co.uk/itm/8-10mm-Wick-Alcohol-Kerosene-Fibe...
If you use clean alchohol the flame is almost pure blue with virtually no yellow,
useful for doing a flame test to help identify metal ions,
and of course just as a heating source.

For heating of test tubes etc. I now use IKEA tealight candles. about 30W heat output.

P.S. These wicks are also excellent for burning boric acid in methanol for an eerie green flame.

[Edited on 11-12-2018 by Sulaiman]

CAUTION : Hobby Chemist, not Professional or even Amateur
arkoma
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 Quote: Originally posted by Geocachmaster I bought a ceramic top hotplate stirrer when I could, but it blew half of this years chem budget. Much better

Corning PC-351. Fine piece of gear. Bought mine used two years ago for$80US on ebay. Self aware bag of organic slime.............. Collector of reagents. Morgan International Hazard Posts: 1262 Registered: 28-12-2010 Member Is Offline Mood: No Mood Quote: Originally posted by Sulaiman  Quote: Originally posted by CobaltChloride Through the hole I put a roll made out of sterile compresses. These fibreglass wicks are excellent. https://www.ebay.co.uk/itm/8-10mm-Wick-Alcohol-Kerosene-Fibe... If you use clean alchohol the flame is almost pure blue with virtually no yellow, useful for doing a flame test to help identify metal ions, and of course just as a heating source. For heating of test tubes etc. I now use IKEA tealight candles. about 30W heat output. P.S. These wicks are also excellent for burning boric acid in methanol for an eerie green flame. [Edited on 11-12-2018 by Sulaiman] I thought this ceramic material would be fun to experiment with as a wick-like capillary pump. http://www.polywatt.com/CFB/CFB.html https://www.wired.com/2003/11/the-curiously-strong-pump/ https://www.appliancedesign.com/articles/85600-igniters-burn... mayko International Hazard Posts: 878 Registered: 17-1-2013 Location: Carrboro, NC Member Is Offline Mood: anomalous inexpensive electroporation device based off piezoelectric lighters:  Quote: ElectroPen: An ultralow-cost piezoelectric electroporator Electroporation is a basic yet powerful method for delivering small molecules (RNA, DNA, drugs) across cell membranes by application of an electrical field. Due to its vital role, electroporation has wide applicability from genetically engineering cells, to drug- and DNA-based vaccine delivery. Despite its broad applications in biological research, the high cost of electroporators is an obstacle for many budget-conscious laboratories. To address this need, we describe a simple, inexpensive, and hand-held electroporator inspired by a common household piezoelectric gas lighter. The proposed 'ElectroPen' device costs about 20 cents, is portable (13 g), is fabricated on-demand using 3D-printing, and delivers repeatable exponentially decaying pulses of about 2000 V in 5 ms. We provide a proof-of-concept demonstration by genetically transforming plasmids into E. coli strains and show comparable transformation efficiency and cell growth with commercial devices, but at a fraction of the cost. Our results are validated by an independent team across the globe, providing a real-world example of democratizing science through frugal tools. Thus, the simplicity, accessibility, and affordability of our device holds potential for making modern synthetic biology accessible in high-school, community, and field-ecology laboratories. https://www.biorxiv.org/content/early/2018/12/21/448977 https://doi.org/10.1101/448977 Some backstory: this was designed by motivated high schoolers! https://twitter.com/BhamlaLab/status/1076325049966252033 al-khemie is not a terrorist organization "Chemicals, chemicals... I need chemicals!" - George Hayduke "Wubbalubba dub-dub!" - Rick Sanchez hacker Harmless Posts: 33 Registered: 18-12-2018 Member Is Offline Housing for Power Controller yobbo II National Hazard Posts: 293 Registered: 28-3-2016 Member Is Offline Mood: No Mood  Quote: Originally posted by RogueRose SO I had some old 400w sodium or metal halide bulbs and I cut them open with a diamond wheel on the dremel. They cut very nicely on the far end (where it screws in) and is just under 2" diameter making it perfect for a 2" bung/plug. These might be great boiling flasks/distillation flasks where there may be remains in the bottom that are difficult to impossible to break up. These are borosillicate glass and they are thicker than both beakers and round bottom flasks that I have checked (broken) by about 20-40%. The setup is self explanitory and I'm going to test it down the road and see what the results are. I plan to use glass tubing coming out of the bung leading to a condenser. IDK if there is anything I need to think of before this, but it seems a plausible idea. The 400w bulbs (Phillips brand & most brands are same size) are 1,4L to 1.5L which is a very nice size and smaller 250w, 175w, 120w, 100w, etc are all freely available from electricians and gives sizes from 220ml up to the 1.5L. I used a simple hose clamp around the neck with some tape to give it something to hold onto. How would you know they are borosilicate? I have cut open one today and intend to fire polish the cut end. There is a nice alumina? tube to be had inside as well. Other halide bulbs (longer and have clear glass) have nice thin alumina tubes that are very useful for shielding thermocouples at their ends Others contain quite a nice looking blob of sodium (I hope to remove some today). The tube inside these bulbs is u in shape, about 10 inches long and could be used for something or other. Yob mayko International Hazard Posts: 878 Registered: 17-1-2013 Location: Carrboro, NC Member Is Offline Mood: anomalous the poseidon syringe pump system:  Quote: While open sourcing has become de rigueur in genomics dry labs, wet labs remain beholden to commercial instrument providers that rarely open source hardware or software, and impose draconian restrictions on instrument use and modification. With a view towards joining others who are working to change this state of affairs, we’ve posted a new preprint in which we describe an open source syringe pump and microscope system called poseidon [....] Together, these components can be used to build a Drop-seq rig for under$400, or they can be used piecemeal for a wide variety of tasks.

overview from one of the authors:
https://liorpachter.wordpress.com/2019/01/18/open-sourcing-b...

preprint:
https://www.biorxiv.org/content/early/2019/01/17/521096

al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
Yttrium2
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 Quote: Originally posted by Plunkett I got tired of using a soup can filled with sand as a test tube holder so I made a proper one from a piece of firewood I had laying around.

I admire this. I admire that you took the time to figure out how to make one that looks good. ect

markx
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Made a small power supply with varied output voltage (0,7-40V, 4A), current control function and some measurement panels for voltage, power and current:

The power supply is made from a standard 12V SMPS coupled with a SEPIC converter. A versatile match that renders a very capable little lab unit for basically a few dollars.

The blue panel meter is truly a disaster regarding the concept of accuracy....was dirt cheap though
But on the contrary the red "high precision ampmeter" below that is truly great for the money. Perhaps I got lucky, but testing against a verified ampmeter it shows exceptional accuracy.

Coupled with a homebrew H-bridge pulsed plating unit:

Makes for great fun in the field of small scale electrochemistry related experimentation.

Exact science is a figment of imagination.......
C6(NO2)5CH2CH(CH3)N(NO2)2
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This appears to be a mild form of vacuum filtration, done using a vacuum cleaner: https://youtu.be/M8lXPlD4M3Y?t=99

I've had problems using paper filters, where the last few ml of liquid will not even drop out, presumably because the weight of the liquid is too little to overcome surface tension. Since I don't have a "real" vacuum pump, I will totally have to try this.

Put that in your pipe and smoke it!
arkoma
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I've used a vacuum cleaner to filter before............

Self aware bag of organic slime..............

Collector of reagents.
Ubya
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 Quote: Originally posted by C6(NO2)5CH2CH(CH3)N(NO2)2 This appears to be a mild form of vacuum filtration, done using a vacuum cleaner: https://youtu.be/M8lXPlD4M3Y?t=99 I've had problems using paper filters, where the last few ml of liquid will not even drop out, presumably because the weight of the liquid is too little to overcome surface tension. Since I don't have a "real" vacuum pump, I will totally have to try this.

if you are really desperate you could build this https://youtu.be/vaho7JSVS1I

pvc hand vacuum pump

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 Sciencemadness Discussion Board » Fundamentals » Reagents and Apparatus Acquisition » Homemade and Repurposed Lab Gear Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues   » Detritus   » Test Forum