A pH-Dependent Phase Separation Drives Polyamine-Mediated Silicification from Undersaturated Solutions.

ABSTRACT: Silica polymerization from its soluble monomers is fundamental to many chemical processes. Although industrial methods require harsh conditions and concentrated precursors, biological silica precipitation occurs under ambient conditions from dilute solutions. The hallmark of biosilica is the presence of amine-rich organic macromolecules, but their functional role remains elusive. Here, we show a pH-dependent stimulatory effect of such polyamines on silica polymerization. Notably, this process is decoupled from the saturation degree, allowing the synthesis of polymer-silica hybrid products with controlled network morphologies from undersaturated solutions. The data suggest a two-step phase separation process. First, an associative liquid-liquid phase separation forms a micrometer-size dense

SUBMITTER: Biswas P 

PROVIDER: S-EPMC11656833 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature