Home Cosmetic Science Talk Formulating Hair Reducing vs increasing the amount of dilution necessary to get coacervate precipitation

  • Reducing vs increasing the amount of dilution necessary to get coacervate precipitation

    Posted by abdullah on May 22, 2022 at 5:05 am

    (1. Higher surfactant concentration increases the amount of dilution necessary to get coacervate precipitation.

    2. Amphoterics combined with anionics increases the amount of dilution necessary to get coacervate precipitation.
    3. Electrolytes increase the dilution necessary to get precipitation.

    4. Hydrophobic emollients reduce the amount of dilution necessary for coacervate precipitation vs. polar emollients or no emollient.)
    This is from ulprospector

    Question is: for better and more deposition of polymer from Shampoo, should we reduce the amount of dilution necessary to get coacervate precipitation or increase it?

    ketchito replied 1 year, 9 months ago 2 Members · 3 Replies
  • 3 Replies
  • ketchito

    Member
    May 22, 2022 at 2:38 pm

    @Abdullah The answer is in those 4 points: it depends on your formula. Nevertheless, coacervate forms at the first part of the dilution process during rinsing (once you have enough water to dilute the excess surfactant, the polymer can reach a stoichiometric balance with the anionic surfactant to form the coavervate and precipitate). 

  • abdullah

    Member
    May 22, 2022 at 2:54 pm

    @ketchito got it.

    This part “increases the amount of dilution necessary to get coacervate precipitation.”
    Does it mean you will need more water to dilute the shampoo and get coacervate precipitation?

  • ketchito

    Member
    May 24, 2022 at 1:23 pm

    Abdullah said:

    @ketchito got it.

    This part “increases the amount of dilution necessary to get coacervate precipitation.”
    Does it mean you will need more water to dilute the shampoo and get coacervate precipitation?

    Yes. You need that extra dilution to either remove the even higher excess surfactant, or the charge screening from salt ions. 

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