The Naked Scientists

The Naked Scientists Forum

Author Topic: Is there a way to increase the surface tension of water?  (Read 46349 times)

paul.fr

  • Guest
is there? If not, why?


 

another_someone

  • Guest
Is there a way to increase the surface tension of water?
« Reply #1 on: 17/11/2007 23:19:22 »
The surface tension of water is created by the van der Waals force (an electrical force between molecules).  In order to increase surface tension, I would imagine one would have to find a way of increasing the range of the force or strength of these electrical forces.

http://www.iop.org/EJ/article/0295-5075/56/2/187/epl_56_2_187.pdf?request-id=tqK2oWKV3BGpnu4O3Ai7Kg
Quote
Contrary to surfactant solutions, aqueous electrolytes possess surface tensions higher than
pure water.

The above is also at http://www.iop.org/EJ/article/0295-5075/56/2/187/6756.html
 

Offline Mr Andrew

  • Sr. Member
  • ****
  • Posts: 206
  • God was primitive man's attempt at Physics.
    • View Profile
Is there a way to increase the surface tension of water?
« Reply #2 on: 20/11/2007 03:47:41 »
To increase the surface tension of water, you'd have to add something to water, in which case, it would no longer be pure water.  By adding something more polar than water to water, the surface tension would increase (just as doing the opposite decreases surface tension).  But then again, unless it takes a relatively small amount of this extremely polar substance, why not just use the additive by itself?  One problem is that it might be very viscous because of its polarity (of even a solid).  Hmmm...sounds like a chemistry thread to me!
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8667
  • Thanked: 42 times
    • View Profile
Is there a way to increase the surface tension of water?
« Reply #3 on: 20/11/2007 19:50:20 »
I rather suspect that the surface tension of water is temperature dependent in which case it's perfectly easy to change it without adding anything.
 

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
Is there a way to increase the surface tension of water?
« Reply #4 on: 20/11/2007 20:30:04 »
Ewe can always freeze it !..whilst playing Hitchcock style music ALA Psycho  !!...this would make it very tense !!
 

Offline Aepos

  • First timers
  • *
  • Posts: 1
    • View Profile
Is there a way to increase the surface tension of water?
« Reply #5 on: 08/01/2009 00:11:28 »
Hi there, Paul.! I'm glad to see you're interested in the science of surface tension! Well, it's a proven fact that as the temperature of water (or any other liquid) approaches freezing, its surface tension increases.

Just see this image:
newbielink:http://hyperphysics.phy-astr.gsu.edu/Hbase/fluids/imgflu/surten3.gif [nonactive]

As you can see the surface tension (in dyne/cm) increases 15 units from boiling to near-freezing.

Hope this helps!
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8132
  • Thanked: 53 times
    • View Profile
Is there a way to increase the surface tension of water?
« Reply #6 on: 08/01/2009 08:10:40 »
Heavy water is more viscous than light water, but their surface tensions are essentially the same.
http://en.wikipedia.org/wiki/Heavy_water#Physical_properties_.28with_comparison_to_light_water.29
 

Offline lightarrow

  • Neilep Level Member
  • ******
  • Posts: 4586
  • Thanked: 7 times
    • View Profile
Is there a way to increase the surface tension of water?
« Reply #7 on: 08/01/2009 12:32:18 »
is there? If not, why?
According to Wiki:
http://en.wikipedia.org/wiki/Surface_tension
Water's surface tension at 0C is 75.64 (maximum value for water), while for a 6M solution of NaCl, at 20C is 82.55. So, I assume that dissolving salts (or maybe even sugar, or both, salt and sugar) will, in general, increase water surface tension. You only have to choose what to dissolve, making maybe some trials.
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8132
  • Thanked: 53 times
    • View Profile
Is there a way to increase the surface tension of water?
« Reply #8 on: 08/01/2009 21:09:26 »
I was thinking a very strong magnetic field may affect surface tension (increase or decrease), and found this article ...

Quote
Rather unexpectedly, such electric fields (~1 MV m-1) apparently increase water's surface tension by about 2%...

There is some dispute over the effects of electric and magnetic fields on surface tension. Electric and magnetic fields have been reported to lower the surface tensions of natural water by up to 8% . However, it has been noted elsewhere that surface tension measurements are too sensitive to impurities to provide reliable data . Recently, high magnetic fields (10 T) have been reported as increasing the surface tension of water by almost 2%, with this being possibly due to the stabilization of the hydrogen bonds or the dampening of surface waves
http://www.lsbu.ac.uk/water/magnetic.html#mag
 

The Naked Scientists Forum

Is there a way to increase the surface tension of water?
« Reply #8 on: 08/01/2009 21:09:26 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums