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Author Topic: Science  (Read 4154 times)

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AGelbert

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Re: Science
« Reply #60 on: December 05, 2016, 05:22:40 pm »
Water inside carbon nanotubes turns solid at boiling temperatures, MIT researchers discover

By Shawn Knight on Dec 3, 2016, 11:00 AM     
 
mit, carbon nanotubes, freeze, water, ice, h2o   

It’s common knowledge that water freezes at zero degrees Celsius (32 degrees Fahrenheit) and boils at 100 degrees Celsius (212 degrees Fahrenheit) in normal conditions. When confined within a carbon nanotube, however, all bets are off.

While conducting an experiment that involved trying to send electric currents through water inside of carbon nanotubes, a team of chemical engineers led by Professor Michael Strano at the Massachusetts Institute of Technology (MIT) noticed some unexpected behavior.

It’s been known for a while now that when water is confined in very small spaces, its freezing and boiling points can drop by as much as 10 degrees Celsius. What the team at MIT observed, however, was quite the opposite. 

Inside tiny carbon nanotubes, they witnessed water solidifying at a minimum temperature of 105 degrees Celsius – well above its normal boiling point.

The diameter of the nanotubes played a significant role in the water’s behavior. The difference between tubes measuring 1.05 nanometers and 1.06 nanometers across changed the freezing temperature by tens of degrees.

Equally as puzzling is the fact that water could even enter nanotubes at all as they’ve long been thought to be hydrophobic.

Agelbert NOTE: "Hydrophobic" means water "hating". Your raincoat is usually coated with a hydrophobic substance. Wax is hydrophobic. "Hydrophilic" is water "loving". The way the water curves up on the edge of a glass is evidence that glass is hydrophilic. Water (H2O), of course is attracted to itself (water molecules inside tree capillaries can be stretched 25 atmospheres and still attract each other as long as the capillary is not exposed to the outer atmosphere. That is how water moves from tree roots to the leaves.

More research will be needed but Strano thinks the discovery could lead to the creation of “ice wires,” or efficient highways to transport protons as water is around 10 times better at conducting protons compared to standard conductive material.

http://www.techspot.com/news/67267-water-inside-carbon-nanotubes-turns-solid-boiling-temperatures.html

Agelbert NOTE: Some good comments that might explain this strange property of carbon nanotube enclosed H2O:


captaincranky TechSpot Addict   

"My immediate thought was, if this occurs with water..what other changes could occur? Relooking at cold fusion where speculation was the molecular space might have allowed nuclear interaction. Other speculation whenever I find that roll of Reynolds.
Well, I think "freezes" might be misapplied terminology."

I'm going to take a wild, uneducated guess here, and postulate the water isn't "frozen" per se. Given the 3 elements in the mix, carbon, hydrogen, & oxygen, the scale at which this is happening, and the amount of molecular activity brought on by applied heat, the water is likely "mimicking" or "masquerading" as, a carbohydrate.

Skypickle   

The diameter of the nanotube is only 5 water molecules across. But these researchers https://www.mpg.de/6362003/water-ice-crystal

Say that you need at least 275 molecules to form an ice crystal. So the 'solid' phase of water cannot occur in the confined space of a nanotube. Rather a different 'boundary ' phase of carbon-water forms

 
browne5061

It is probably the hydrophobic nature of the CNTs that forces the solidification. As you increase the energy of the particles, they find themselves bound inside of the CNT and unable to leave. This would likely significantly increase the number of collisions between H2O molecules, giving the appearance of being a solid, without needing as many molecules as is normally required to form an Ice crystal as Skypickle points out.

Still, I wonder why they were putting water inside of CNTs in the first place. The common conception is they are hydrophobic, plus CNTs already display ballistic conductance of both electrical and thermal energy. I find it hard to believe that anyone would go 'yeah, lets add thermally *capacitive* material (water) to increase thermal *conductivity.*' I think they were trying for something else entirely, which they aren't ready to publically talk about yet. My guess would a new kind of thermal heat sink, with both high conductivity from the CNTs and high capacitance from the H2O - and this would explain why they brought it up to such high temperatures in the first place, since CNTs don't heat up readily when an electric current is applied.

wiyosaya   

My thoughts are that the size of the nanotube is somehow forcing the molecules of water to align in a fashion where they do not move - thus giving the appearance of a crystallized set of molecules.


Yynxs

Somewhere in non-available memory was some reading on crystal forming temperatures of water with additives such as salt and something to do with 'absolutely pure' water having different bonding reactions than just distilled water. I'm wondering if the size of the nanotubes creates an 'absolutely pure' water condition and whether that affects 'hydrophobic' as used to describe the carbon molecules. I know when I don't know so I'm sending this article to a friend 'Saint Jack' to see if he knows anything.
Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life. Pr. 13:12

 

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