Rapid Additive Manufacturing of 3D Geometric Structures via Dual-Wavelength Polymerization Li, F., Thickett, S.C., Maya, F., Doeven, Egan, Guijt, Rosanne and Breadmore, M.C. 2020, Rapid Additive Manufacturing of 3D Geometric Structures via Dual-Wavelength Polymerization, ACS Macro Letters, vol. 9, pp. 1409-1414, doi: 10.1021/acsmacrolett.0c00465. Attached Files Name Description MIMEType Size Downloads Title Rapid Additive Manufacturing of 3D Geometric Structures via Dual-Wavelength Polymerization Author(s) Li, F. Thickett, S.C. Maya, F. Doeven, Egan orcid.org/0000-0003-2677-4269 Guijt, Rosanne orcid.org/0000-0003-0011-5708 Breadmore, M.C. Journal name ACS Macro Letters Volume number 9 Start page 1409 End page 1414 Total pages 6 Publisher American Chemical Society Place of publication Washington, D.C. Publication date 2020 ISSN 2161-1653 2161-1653 Summary A dual-wavelength photopolymerization process is presented, allowing for the volumetric fabrication of complex geometries using a multistep process. The methacrylate-based resin contained 0.1 wt % camphorquinone/0.1 wt % ethyl 4-(dimethylamino) benzoate and 0.2 wt % bis[2-(ochlorophenyl)-4,5-diphenylimidazole] as photoinitiator (473 nm) and photoinhibitor (365 nm), respectively. The photoinitiator and photoinhibitor concentrations were optimized to allow for photocuring to full depth (4.6 mm) following an exposure time of 2 min solely by 473 nm light, but no curing occurred when 365 nm light was present due to photoinhibition. This resin was validated using one-step volumetric fabrication of two objects containing voids defined by the 365 nm irradiation region. Two more complex structures were printed in a step-by-step manner, relying on the dynamic control of the projection patterns of both 365 and 473 nm projectors, decreasing the print time from 20 min using a commercially available single wavelength resin printer to 2 min. Language eng DOI 10.1021/acsmacrolett.0c00465 Indigenous content off Field of Research 0303 Macromolecular and Materials Chemistry 0306 Physical Chemistry (incl. Structural) HERDC Research category C1 Refereed article in a scholarly journal Persistent URL http://hdl.handle.net/10536/DRO/DU:30144314 Document type: Journal Article Collections: Faculty of Science, Engineering and Built Environment Centre for Regional and Rural Futures Related Links Link Description Connect to published version Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Mon, 19 Oct 2020, 10:38:11 EST Tue, 20 Oct 2020, 04:00:52 EST Tue, 20 Oct 2020, 05:06:15 EST Tue, 20 Oct 2020, 13:30:55 EST Tue, 20 Oct 2020, 13:32:00 EST Tue, 20 Oct 2020, 14:48:50 EST Filtered Full Citation counts:   Cited 0 times in TR Web of Science Cited 0 times in Scopus Search Google Scholar Access Statistics: 30 Abstract Views, 0 File Downloads  -  Detailed Statistics Created: Mon, 19 Oct 2020, 10:38:11 EST

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