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I am currently working on a heterogeneous photocatalyst project. We are having significant problems with the catalyst not staying suspended in an aqueous solution. What can I do to prevent aggregation of an oxide catalyst. I suspect there are lots of possible solutions.

Some extra details about my specific system:

  • Aqueous solvent (pH: ~7)
  • Nanoparticles around 100-200 nm
  • Isoelectric point around pH 3 - 4
  • Roughly 0.2 mg of catalyst / mL
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    $\begingroup$ Nobody can suggest anything to a generic query without knowing any details. Mention the particle size of the oxide. $\endgroup$
    – M. Farooq
    Oct 2 '20 at 2:06
  • $\begingroup$ I will add some details $\endgroup$ Oct 2 '20 at 2:10
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    $\begingroup$ It would depend on the reactivity of the oxides, and the tolerable viscosity. A first thought would be some organic dispersant, perhaps siloxanes. See sciencedirect.com/science/article/abs/pii/S0927775714001691 $\endgroup$ Oct 2 '20 at 2:24
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    $\begingroup$ How about you do your literature study? $\endgroup$
    – Karl
    Oct 2 '20 at 7:41
  • $\begingroup$ To float for how long? An initial thought was add either sodium dodecylsulfate (SDS) (example and or polyethylene glycol (PEG). Vendors' lists may be an inspiration (example), «NP ink» and «quantum dot» (both used e.g., for printing organic electronics) equally may yield hits. $\endgroup$
    – Buttonwood
    Oct 2 '20 at 7:43

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