Notices
Results 1 to 13 of 13

Thread: eew sticky

  1. #1 eew sticky 
    墨子 DaBOB's Avatar
    Join Date
    Jun 2006
    Posts
    1,674
    What makes things sticky. I am thinking of sugar in particular but also in general.


    Do not try and bend the spoon. That's impossible. Instead... only realize the truth. There is no spoon. Then you'll see that it is not the spoon that bends, it is only yourself. -Spoon Boy
    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Freshman
    Join Date
    Aug 2006
    Location
    Bath, UK
    Posts
    77
    As far as I know it's down to the action of intermolecular and or intramolecular forces on the surface of a substance.


    Reply With Quote  
     

  4. #3  
    Moderator Moderator AlexP's Avatar
    Join Date
    Jul 2006
    Location
    NY
    Posts
    1,838
    Quote Originally Posted by Lucky
    As far as I know it's down to the action of intermolecular and or intramolecular forces on the surface of a substance.
    that ^^^ makes sense to me.
    Reply With Quote  
     

  5. #4  
    Forum Bachelors Degree The P-manator's Avatar
    Join Date
    Nov 2005
    Location
    Toronto
    Posts
    474
    Would it be that they form like half-bonds with the thing they're sticking to?
    Pierre

    Fight for our environment and our habitat at www.wearesmartpeople.com.
    Reply With Quote  
     

  6. #5  
    Moderator Moderator AlexP's Avatar
    Join Date
    Jul 2006
    Location
    NY
    Posts
    1,838
    there aren't any "half bonds" like Lucky said, i'd guess that it has to do with intermolecular bonds, which aren't bonds that involve electrons, like most, just bonds between molecules. Examples are hydrogen bonds and Van Der Waals/London dispersion forces.
    Reply With Quote  
     

  7. #6  
    墨子 DaBOB's Avatar
    Join Date
    Jun 2006
    Posts
    1,674
    I kinda dought there are hydrogen bonds on the back of a sticker. Van Der Waals are very week forces. Maybe these would have something to do with sugars but not other stickier type things.
    Do not try and bend the spoon. That's impossible. Instead... only realize the truth. There is no spoon. Then you'll see that it is not the spoon that bends, it is only yourself. -Spoon Boy
    Reply With Quote  
     

  8. #7  
    Forum Freshman Draculogenes's Avatar
    Join Date
    Oct 2006
    Posts
    76
    I don't know if this will help, but my chem prof keeps telling us about how gecko's walk on walls. this was just recently discovered actually. on their feet they have tiny hairs, each hair has tiny hairs, and each one of those has tiny hairs... as you can imagine this get's pretty ridiculous after a while. anyway, there is so much surface area with all the tiny hairs that the london dispersion forces(i think it's those ones) will be so numerous as to hold the gecko to a wall or ceiling. Now i don't think glue and sugar etc. goes by the same concept, but it should be related.

    They are actually trying to manufacture this kind of "gecko-sticker" now. It would be a very effecting re-usable adhesive.
    Reply With Quote  
     

  9. #8  
    Forum Bachelors Degree The P-manator's Avatar
    Join Date
    Nov 2005
    Location
    Toronto
    Posts
    474
    Imagine! All our bumber stickers attached with hair!
    Pierre

    Fight for our environment and our habitat at www.wearesmartpeople.com.
    Reply With Quote  
     

  10. #9  
    Moderator Moderator AlexP's Avatar
    Join Date
    Jul 2006
    Location
    NY
    Posts
    1,838
    Quote Originally Posted by Draculogenes
    anyway, there is so much surface area with all the tiny hairs that the london dispersion forces(i think it's those ones)
    yes, i'm pretty sure it is that type of intermolecular bonding, london dispersion.
    Reply With Quote  
     

  11. #10  
    Universal Mind John Galt's Avatar
    Join Date
    Jul 2005
    Posts
    14,168
    I'm missing something. Sugars are sticky? Sucrose? Sticky?
    Reply With Quote  
     

  12. #11  
    Forum Freshman
    Join Date
    Aug 2006
    Location
    Bath, UK
    Posts
    77
    Sugar isn't really sticky dry but it is when wet. About a week ago I dropped sugar on my kitchen floor and I can still feel it when I walk over it.

    As for why sugar in particular is sticky, looking at the molecule I would say almost definately it's down to hydrogen bonding (http://en.wikipedia.org/wiki/Image:Saccharose.svg )
    If you think about waters cohesion due to hydrogen bonding between just two hydrogens and an oxygen, it's no wonder sucrose is sticky with the numerous amounts of oxygens, hydrogens and alcohol groups dotted around the molecule.
    Reply With Quote  
     

  13. #12  
    Universal Mind John Galt's Avatar
    Join Date
    Jul 2005
    Posts
    14,168
    Wet sugar certainly. I can buy that idea, but not dry.
    Reply With Quote  
     

  14. #13  
    墨子 DaBOB's Avatar
    Join Date
    Jun 2006
    Posts
    1,674
    Coolness!!! So far I would say that everything is making pretty good sense. Thanks.
    Do not try and bend the spoon. That's impossible. Instead... only realize the truth. There is no spoon. Then you'll see that it is not the spoon that bends, it is only yourself. -Spoon Boy
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •