Etymology: Backformation < coacervation n.Chem.
An aggregate forming viscous drops in a colloidal solution.
1929 De Jong & Kruyt in Proc. Konink. Akad. van Wetenschappen te Amsterdam XXXII. 853 The coacervate is a drop or a layer, in which the particles have flocked together as bees in a swarm. (OED)
"At concentrations slightly above the critical micelle concentration a phase separation occurs by formation of a coacervate (in the erminology of Bungenberg de Jon: a unicomplexcoacervate)."
- Tausk et al., "Physical chemical studies of short-chain lecithin homologues. I. Influence of the chain length of the fatty acid ester and of electrolytes on the critical micelle concentration", Biophysical Chemistry 1:175 (1973)