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How to synthesize hydrophobic CaCo3

  1. Oct 24, 2016 #1
    Hi, I'm new in this forum and I would like to salute everyone in here
    I'm currently trying to synthesize hydrophobic CaCo3 particles in a wood sample, so it fills the wood cells and cover it's surface. In order to achieve this, I try to simulate a biomineralization process using an organic substrate in a methanol solution, for the synthesized CaCo3 particles to be hydrophobic.
    The organic substrate used is Oleic Acid
    The proccess is the follow:
    The wood sample is submerged in 1M Na2CO3 solution for 24h. Oleic Acid is mixed with a Methanol Solution then added to 1M CaCl2 solution, the wood sample is removed and puto into the CaCl2 solution for 24h.
    The wood sample is washed with distiled water and ethanol several times, then dried in an oven for 24 hours.
    Even though I can clearly see the CaCo3 particles in the wood, the surface doesn't seem to be hydrophobic, as it still absorbs water. I can't really tell what is wrong with the cristalization process, perhaps I could add stir in the wood submersion, because when the methanol-oleic acid solution is added to CaCl2 solution an organic phase is formed, thus the a portion of the wood sample remains in each phase.
    I'm currently out of ideas, any help would be much appreciated.
    Last edited by a moderator: Apr 19, 2017
  2. jcsd
  3. Oct 24, 2016 #2
  4. Oct 24, 2016 #3


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    Staff: Mentor

    Beware - CaCO3 and CaCo3 are two different things. As far as I am aware the latter doesn't exist, no wonder you have problems making it :-p
  5. Oct 24, 2016 #4
    Exactly, i couldn't get dodecanoic acid in my country so i tried using oleic acid.
  6. Oct 24, 2016 #5
    Hahahah just a little typo :p
  7. Oct 24, 2016 #6
    From little typos mighty explosions may grow
  8. Oct 25, 2016 #7
    Molecular insight into the nanoconfined calcite–solution interface

    Your thread caught my attention because of biomineralization of CaCO3. While I know nothing about creating composite material, this paper might provide some in sights and possibilities of using silica in the system. This might decrease the hydrophilic surface of the calcite.
  9. Oct 27, 2016 #8
    That's a pretty interesting document, I'll see if I can use it on my project.
    Thank you very much!
  10. Nov 2, 2016 #9
    Try this one: Mechanistic approach to predict the combined effects of additives and surface templates on calcium carbonate mineralization. Crystal Growth&Design, DOI: 10.1021/acs.cgd.6b00514, 2016.
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