Surfactants and their HLB values

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Author:
jcu1
ID:
215770
Filename:
Surfactants and their HLB values
Updated:
2013-04-25 15:20:59
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DD3 final
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DD3 final
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  1. antifoaming hlb
    1-3
  2. w/o emulsifier hlb
    4-6
  3. wetting agents hlb
    7-9
  4. o/w emulsifiers hlb
    8-18
  5. detergents hlb
    13-15
  6. solubilizers hlb
    10-18
  7. sorbitan monooleate
    4.3
  8. sorbitan nonostearate
    4.7
  9. gelatin type a
    9.8
  10. tiethanolamine oleate
    12
  11. polyoxyethylene 20 sorbitan monolaurate
    13.3
  12. polyoxyethylene 20
    15
  13. ostwald ripening
    when small crystals dissolve and then recrystalize into larger particles

    happens more in w/o emulsions
  14. 3 ways to pump one phase into another to form an emulsion
    • mechanical stirreres
    • homogenizers
    • colloid mills
  15. 6 methods of preparing an emulsion
    • continental or dry gum method
    • english or wet/gum method
    • bottle or forbes bottle method
    • auxiliary method
    • in SITU soap method
    • microemulsion
  16. describe the continental/dry method of preparing an emulstion
    4:2:1 :: oil:water:gum for the initial mixture

    • 1. emulsifier triturated with oil in mortar
    • 2. water added
    • 3. triturate until thick cream formed
    • 4. add rest of the water
  17. describe the english/wet method of preparing an emulsion
    4:2:1 :: oil:water:gum

    • 1. triturate gum with water in mortar
    • 2. add oil slowly
    • 3. mix for several minutes for primary emulsion
    • 4. add rest of water
  18. describe the bottle/forbes method of preparing an emulsion
    for preparation of emulsions from volatile oils or oleaginous things of low viscosity

    • 2:2:1 :: oil:water:gum
    • using dry method

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