Observation of intensity dependent phase-separation in photoreactive monomer-nanoparticle formulations under non-uniform visible light irradiation

Shreyas Pathreeker, Fu Hao Chen, Saeid Biria, Ian D. Hosein

Research output: Contribution to journalArticlepeer-review

Abstract

We report observations of photopolymerization driven phase-separation in a mixture of a photo-reactive monomer and inorganic nanoparticles. The mixture is irradiated with visible light possessing a periodic intensity profile that elicits photopolymerization along the depth of the mixture, establishing a competition between photo-crosslinking and thermodynamically favorable phase-separating behavior inherent to the system. In situ Raman spectroscopy was used to monitor the polymerization reaction and morphology evolution, and reveals a key correlation between irradiation intensity and composite morphology extending the entire depth of the mixture, i.e. unhindered phase-separation at low irradiation intensity and arrested phase-separation at high irradiation intensity. 3D Raman volume mapping and energy dispersive X-ray mapping confirm that the intensity-dependent irradiation process dictates the extent of phase separation, enabling single-parameter control over phase evolution and subsequent composite morphology. These observations can potentially enable a single-step route to develop polymer-inorganic composite materials with tunable morphologies. This journal is

Original languageEnglish (US)
Pages (from-to)7256-7269
Number of pages14
JournalSoft Matter
Volume16
Issue number31
DOIs
StatePublished - Aug 21 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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