Volumetric photopolymerization confinement through dual-wavelength photoinitiation and photoinhibition

Harry L. Van Der Laan, Mark A. Burns, Timothy Scott

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)


Conventional photolithographic rapid prototyping approaches typically achieve reaction confinement in depth through patterned irradiation of a photopolymerizable resin at a wavelength where the resin strongly absorbs, such that only a very thin layer of material is solidified. Consequently, three-dimensional objects are fabricated by progressive, two-dimensional addition of material, curtailing fabrication rates and necessitating the incorporation of support structures to ensure the integrity of overhanging features. Here, we examine butyl nitrite as a UV-active photoinhibitor of blue light-induced photopolymerizations and explore its utilization to confine in depth the region polymerized in a volume of resin. By employing two perpendicular irradiation patterns at blue and near-UV wavelengths to independently effect either polymerization initiation or inhibition, respectively, we enable three-dimensional photopolymerization patterning in bulk resin, thereby complementing emergent approaches to volumetric 3D printing.

Original languageEnglish
Pages (from-to)899-904
Number of pages6
JournalACS Macro Letters
Issue number8
Publication statusPublished - 20 Aug 2019
Externally publishedYes

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