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Hydrogels
WHAT IS A HYDROGEL?
Hydro=Water
Solid that absorbs
water
So, what does the solid
part look like?
Many Small
Molecules
One Large
Molecule
POLYMER
CROSS-LINKING = POLYMER
NETWORK
http://soft-matter.seas.harvard.edu/index.php/Cross-linking
Polymer Chains
Crosslinks
EFFECT OF WATER
Dry solid
(collapsed)
Hydrogel
(swollen
network)
DIAPER
http://disposablediaper.net/general-information/disposable-diaper-history/
What’s really going
on?
POLYACRYLAT
E hy...
HAVE YOU EVER MADE JELL-O?
WHAT’S IN JELL-O?
Gelatin
Structure
MAKING JELL-O &
WHAT HAPPENS WHEN YOU HEAT
IT?
Gelatin Powder
Water
Liquid Solid Hydrogel
cooling
re-heating
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hydrogel

  1. 1. Hydrogels
  2. 2. WHAT IS A HYDROGEL? Hydro=Water Solid that absorbs water So, what does the solid part look like?
  3. 3. Many Small Molecules One Large Molecule POLYMER
  4. 4. CROSS-LINKING = POLYMER NETWORK http://soft-matter.seas.harvard.edu/index.php/Cross-linking Polymer Chains Crosslinks
  5. 5. EFFECT OF WATER Dry solid (collapsed) Hydrogel (swollen network)
  6. 6. DIAPER http://disposablediaper.net/general-information/disposable-diaper-history/ What’s really going on? POLYACRYLAT E hydrogel
  7. 7. HAVE YOU EVER MADE JELL-O?
  8. 8. WHAT’S IN JELL-O? Gelatin Structure
  9. 9. MAKING JELL-O & WHAT HAPPENS WHEN YOU HEAT IT? Gelatin Powder Water Liquid Solid Hydrogel cooling re-heating

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