English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Two-photon photopolymerization delivers prints without support structures andminimizes layering artifacts in a broad range of materials. This volumetricprinting approach scans a focused light source throughout the entire volume ofa resin vat and takes advantage of the quadratic power dependence of two photonabsorption to produce photopolymerization exclusively at the focal point. Whilethis approach has advantages, the widespread adoption of two photonphotopolymerization is hindered by the need for expensive ultrafast lasers andextremely slow print speeds. Here we present an analogous quadratic process,triplet-triplet-annihilation-driven 3D printing, that enables volumetricprinting at a focal point driven by <4 milliwatt-power continuous waveexcitation. To induce photopolymerization deep within a vat, the key advance isthe nanoencapsulation of photon upconversion solution within a silica shelldecorated with solubilizing polymer ligands. This scalable self-assemblyapproach allows for scatter-free nanocapsule dispersal in a variety of organicmedia without leaking the capsule contents. We further introduce an excitonicstrategy to systematically control the upconversion threshold to support eithermonovoxel or parallelized printing schemes, printing at power densitiesmultiple orders of magnitude lower than power densities required fortwo-photon-based 3D printing. The application of upconversion nanocapsules tovolumetric 3D printing provides access to the benefits of volumetric printingwithout the current cost, power, and speed drawbacks. The materialsdemonstrated here open opportunities for other triplet fusionupconversion-controlled applications.

Triplet Fusion Upconversion Nanocapsules for Volumetric 3D Printing