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thoughts on laboratory lattice
I still have some used 1/2" Al lattice rod and connectors. I have sold most for 1/2 to 1/4 than th ... |
13-8-2018 at 09:36
by: Dr.Bob |
Is an automatic transfer pipette useful - which one ?
The Eppendorf repeater is positive displacement, so it handles low bp solvents much better. I hav ... |
1-8-2018 at 16:43
by: Dr.Bob |
Catalytic hydrogenation - preparation of hydrogen in situ
Pd on carbon is sometimes made by coating the carbon with PdCl2 and then reducing in situ, so not ha ... |
1-8-2018 at 16:38
by: Dr.Bob |
Is an automatic transfer pipette useful - which one ?
If you can find a used Gilson Pipetteman (not a cheap rip off) for a good price, it might be worth i ... |
31-7-2018 at 17:30
by: Dr.Bob |
Increasing water pump pressure using 2 pumps in series?
[rquote=525793&tid=85787&author=wg48temp]
Say you are gravity filtering a liquid and the in ... |
30-7-2018 at 17:25
by: Dr.Bob |
Conversion of Acetone to a Gasoline Alternative
[rquote=524775&tid=85118&author=Melgar]Just my take on it though, I could easily be wrong.[/ ... |
26-7-2018 at 09:25
by: Dr.Bob |
Sealing ground glass - Glindemann rings (PTFE) vs sleeves vs grease?
I have not used his PTFE rings, but tried many PTFE sleeves. Most are too thick and don't seal wel ... |
24-7-2018 at 17:01
by: Dr.Bob |
How do you clean stubbornly dirty glassware when no solvent seems to work?
I like a base bath for stubborn stains. Just dump 4-8 ounces of NaOH per gallon of EtOH, let disso ... |
21-7-2018 at 04:34
by: Dr.Bob |
replacement of diethyl ether
THF works pretty well in most cases, and using salt (brine) can lower its solubility in water. A mi ... |
10-7-2018 at 10:57
by: Dr.Bob |
Relocating labs ? Any experiences?
It is illegal to ship almost any hazmats via the US Mail. They are very picky and it is a federal ... |
25-6-2018 at 07:26
by: Dr.Bob |
Inspecting and destressing glassware
The number of times I have used glassware above 200 C is pretty rare. There have been a few times, ... |
23-6-2018 at 06:15
by: Dr.Bob |
Inspecting and destressing glassware
[rquote=522535&tid=84361&author=coppercone]Dr bob, really the internal stresses go away over ... |
22-6-2018 at 06:20
by: Dr.Bob |
Inspecting and destressing glassware
I have used lab glass for 30 years and you are likely worrying too much unless you are doing actual ... |
21-6-2018 at 12:43
by: Dr.Bob |
Phenylpiperazine Formation From Aniline
Most commercial aryl piperazines are made via Ullman or Buchwald chemistry now. Those are the simp ... |
19-6-2018 at 16:45
by: Dr.Bob |
What are the hard white rubber stoppers made of ?
Those are just butyl rubber, or natural rubber, likely with many additives. The red rubber is basic ... |
18-6-2018 at 12:26
by: Dr.Bob |
FREE chemicals
That is awesome. I would go get the isopropanol, sodium hydroxide and other inorganics, then repack ... |
14-6-2018 at 04:27
by: Dr.Bob |
Lithiation reaction of an Aniline... gooey yield problems, uncrystalizable, not sure where I went wrong
Usually BuLi is added slowly, over many minutes. Often at low temps, so that seems unusual to go q ... |
12-6-2018 at 15:42
by: Dr.Bob |
Are there chinese hotplates & heating mantles as good as others but significantly cheaper?
I can agree that some Chinese glassware is fine. But having used some Chinese electronics, I would ... |
11-6-2018 at 17:37
by: Dr.Bob |
Lithiation reaction of an Aniline... gooey yield problems, uncrystalizable, not sure where I went wrong
Did they not cool the reaction before adding the BuLi? That is pretty standard to avoid spikes in ... |
10-6-2018 at 13:58
by: Dr.Bob |
temp probes for thermoSci and IKA hotplates
Why, are you busy this time of year? ;-)
I have a photo of a few of the thermocouples and some ... |
6-6-2018 at 05:38
by: Dr.Bob |
temp probes for thermoSci and IKA hotplates
I have lots of various thermocouples also, including some long Teflon ones, and many other varieties ... |
5-6-2018 at 09:26
by: Dr.Bob |
Is there a solvent I can use to wash my vacuum pump oil reservoir?
DCM will kill the gaskets, seals, and metal in pumps, so don't let that get into the pump if possibl ... |
30-5-2018 at 17:55
by: Dr.Bob |
Science equipment looking for a home
Here is an updated copy of the inventory. I have a hard time keeping it updated, but I am trying. ... |
29-5-2018 at 18:00
by: Dr.Bob |
Is there a solvent I can use to wash my vacuum pump oil reservoir?
The biggest issue with doing that is any solvent left in the pump can wreck it when you restart it. ... |
29-5-2018 at 12:56
by: Dr.Bob |
Good sources of cerium
Ceric Ammonium Nitrate is used in many labs, that would be my first thing to try to find a sample of ... |
27-5-2018 at 18:19
by: Dr.Bob |
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