Pages:
1
2 |
unionised
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 5111
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
"The eutectic mixture of Na and K metals melts at room temperature or only just above, I believe."
Must be chilly in your place, that stuff melts 12 degrees below freezing.
|
|
MadHatter
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 1333
Registered: 9-7-2004
Location: Maine
Member Is Offline
Mood: Enjoying retirement
|
|
Glycerine
Glycerin will freeze on a block of ice. It stays solid below 20 C (68 F). Just an idea.
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
|
|
neutrino
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 1583
Registered: 20-8-2004
Location: USA
Member Is Offline
Mood: oscillating
|
|
Theoretically, it will. The only problem is that glycerin is one of those things that is very hard to crystalize.
|
|
If_6_was_9
Unregistered
Posts: N/A
Registered: N/A
Member Is Offline
|
|
Coconut oil
|
|
hodges
National Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 525
Registered: 17-12-2003
Location: Midwest
Member Is Offline
|
|
Freezing/Melting Observations
I recently obtained some new chemicals, including DMSO and 99% acetic acid. I put a few ml of each in two test tubes and put them in the
refrigerator.
The DMSO froze quickly. The acetic acid remained a liquid. So I put the acetic acid in the freezer (-20C). It still did not freeze. I stirred it
with a plastic dropper and it froze.
I watched the behavior of these solids as I warmed the test tubes with my hand. The acetic acid melted rapidly, starting to form liquid before I even
put my hand on the test tube. It was all melted in a minute. The DMSO, on the other hand, stayed solid for a long time, and felt cold to my hand the
whole time. I have not looked up the heats of fusion for these two substances but I would guess based on my tests that DMSO has a far higher heat of
fusion than acetic acid. DMSO might prove practical for storing heat/cold. I doubt acetic acid would be.
Hodges
|
|
12AX7
Post Harlot
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 4803
Registered: 8-3-2005
Location: oscillating
Member Is Offline
Mood: informative
|
|
Hmm, so supersaturated solutions aren't restricted to metal acetates, eh?
Tim
|
|
DeAdFX
Hazard to Others
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 339
Registered: 1-7-2005
Location: Brothel
Member Is Offline
Mood: @%&$ing hardcore baby
|
|
Tert Butyl Alcohol The stuff is sometimes a frozen block or a clear liquid at room temp
|
|
ethan_c
Hazard to Others
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 104
Registered: 5-6-2006
Member Is Offline
Mood: No Mood
|
|
this is an old, old thread, but…
cesium, anyone?
|
|
JohnWW
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 2849
Registered: 27-7-2004
Location: New Zealand
Member Is Offline
Mood: No Mood
|
|
Caesium is too dangerous to handle - must not be exposed to any gases or liquids other than argon and aliphatic hydrocarbons. How about gallium,
instead? (M.pt. 29ºC), or, for a lower melting point, eutectic mixtures of it with indium, bismuth, tin. Mixing it with mercury would also work, but
there would be the toxicity problem.
|
|
unionised
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 5111
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
Caesium and gallium were 2 of the early sugestions Did you read the thread before posting those replies?
|
|
ethan_c
Hazard to Others
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 104
Registered: 5-6-2006
Member Is Offline
Mood: No Mood
|
|
Quote: | Originally posted by unionised
Caesium and gallium were 2 of the early sugestions Did you read the thread before posting those replies? |
Woop. I did, but I didn't see neutrino's single-sentence mention of Cs.
I just like the idea more than anything. I really want to spend a paycheck on a big ol' ampoule as a present to myself.
|
|
Fleaker
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 1252
Registered: 19-6-2005
Member Is Offline
Mood: nucleophilic
|
|
I'm pretty sure dodecane melts at about 22.4C always solid whenever I look at the bottle in the laboratory.
|
|
unionised
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 5111
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
Since the literature value for the melting point of dodecane is about 12 degrees below freezing I think you need a better heater in the lab.
Are you sure you don't mean docosane (bpt 224 @15mmHg)
|
|
Fleaker
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 1252
Registered: 19-6-2005
Member Is Offline
Mood: nucleophilic
|
|
Gah, not dodecane, I meant *heptadecane* (at least I was right about the decane part , but still 5 carbons off).
|
|
IrC
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 2710
Registered: 7-3-2005
Location: Eureka
Member Is Offline
Mood: Discovering
|
|
I made a mix of tin, bismuth, gallium, and various and sundry other metals which melts just sitting on my table.
|
|
The_Davster
A pnictogen
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 2861
Registered: 18-11-2003
Member Is Offline
Mood: .
|
|
In what ratio?
|
|
IrC
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 2710
Registered: 7-3-2005
Location: Eureka
Member Is Offline
Mood: Discovering
|
|
Who knows, just playing around adding this and that. I have lots of the metals. Oh yeah, I forgot, I put Indium in there also. Don't ask how much, it
was not a scientific experiment, just boredom.
If it did something super futuristic I am sure I could do more controlled mixing and recreate it. Was trying to make ways to mirror my super thin
carbon to float on top my magnets and make a cool sensor for something or other.
I am thinking it was around 45 percent Bismuth, 10% Tin, 30% Gallium, 15% Indium. It is also in the high 80's to low 90's in here (I get lung
infections every summer around July if I run too much AC all the time, so I shut it off every so often), and you can tell it is melting while it is
not a liquid completely.
[Edited on 22-7-2006 by IrC]
|
|
-jeffB
Hazard to Others
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 185
Registered: 6-12-2007
Member Is Offline
Mood: No Mood
|
|
multiple liquid phases, anyone?
Quote: | Originally posted by JohnWW
Caesium is too dangerous to handle - must not be exposed to any gases or liquids other than argon and aliphatic hydrocarbons. How about gallium,
instead? (M.pt. 29ºC), or, for a lower melting point, eutectic mixtures of it with indium, bismuth, tin. Mixing it with mercury would also work, but
there would be the toxicity problem. |
A search on Google for gallium mercury yields this as the first link:
http://www.springerlink.com/index/U4614M3617W0G7Q3.pdf
You probably need institutional access or a subscription to get at the paper, but the bottom line is that mercury is only slightly soluble in gallium
(or vice-versa) -- less than 1%, until you reach a critical point at 203.5ºC.
I looked into this some time ago when I was trying to figure out the maximum number of mutually immiscible liquids you could put in a bottle at
something approaching STP. I got as far as mercury, gallium, silicone oil, fluorocarbon, water, hydrocarbon -- six phases, mutually immiscible,
although I'm not completely convinced I could keep the silicone oil from fraternizing with both the hydrocarbon and the fluorocarbon. Can
anyone suggest a seventh phase? For that matter, can anyone suggest a transparent container substance that is inert to the whole list and isn't
wetted by gallium? It's not such a fun demo if the gallium sticks to the bottle, turning it into a mirror and hiding everything else...
|
|
Xenoid
National Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 775
Registered: 14-6-2007
Location: Springs Junction, New Zealand
Member Is Offline
Mood: Comfortably Numb
|
|
This company (Indium Corporation)
http://www.indium.com/products/fusiblealloys.php
makes a range of gallium/indium alloys with MPs ranging from about 7 oC. up to 30 oC.
They are marketed as mercury substitutes (for physical processes). I haven't enquired about the prices.....
|
|
dann2
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 1523
Registered: 31-1-2007
Member Is Offline
Mood: No Mood
|
|
Hello,
Try a search for Woods metal for low melting point compositions.
They will be above room temp though
Dann2
|
|
unionised
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 5111
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
-jeffB
If you saturate the water with salt then you can add acetonitrile as another phase.
|
|
-jeffB
Hazard to Others
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 185
Registered: 6-12-2007
Member Is Offline
Mood: No Mood
|
|
Quote: | Originally posted by unionised
-jeffB
If you saturate the water with salt then you can add acetonitrile as another phase. |
Interesting! But I fear the salt water would attack the gallium, especially in galvanic contact with the mercury. Rats.
That might be a good phase to replace the gallium outright, though -- the gallium is sticky, and the interface between the gallium and mercury would
probably be hard to see.
Is acetonitrile really immiscible with hydrocarbons/fluorocarbons/silicones? I'm getting seriously tempted to actually try this...
|
|
Pages:
1
2 |