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dc.contributor.authorNg, Chin Siangen_US
dc.contributor.authorSubramanian, Alamelu Suriyaen_US
dc.contributor.authorSu, Pei-Chenen_US
dc.identifier.citationNg, C. S., Subramanian, A. S. & Su, P. (2022). Zinc oxide nanoparticles as additives for improved dimensional accuracy in vat photopolymerization. Additive Manufacturing, 59(Part A), 103118-.
dc.description.abstractTo improve the dimensional accuracy of 3D printed parts produced by vat photopolymerization, a controlled light penetration through the photopolymer resin is necessary to avoid excessive unwanted curing caused by overexposure. Although photoabsorbing additives like Sudan I can attenuate light to decrease excessive light penetration, they also require longer exposure time to solidify the resin. In this work, photocatalytic zinc oxide nanoparticles (ZnONP) were used as resin additives substituting photoabsorbers to control overexposure that causes loss in dimensional accuracy. Compared to adding 0.1 wt/wt% of Sudan I, adding 2.5 wt/wt% of ZnONP not only showed similar level of control in light penetration, but reduced the required curing time of the resin. Significant improvement in preventing unwanted curing was also observed in resin with ZnONP, as evident by our printing tests on open channels and overhanging structures. Unlike Sudan I which deteriorated the mechanical properties of printed parts, ZnONP additives have rendered more effective curing that resulted in improved tensile strength, fracture strain and Young's modulus.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofAdditive Manufacturingen_US
dc.rights© 2022 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleZinc oxide nanoparticles as additives for improved dimensional accuracy in vat photopolymerizationen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.researchSingapore Centre for 3D Printingen_US
dc.identifier.issuePart Aen_US
dc.subject.keywords3D Printingen_US
dc.subject.keywordsVat Photopolymerizationen_US
dc.description.acknowledgementThis research is supported by the National Research Foundation, Prime Minister's Office, Singapore under its Medium-Sized Centre funding scheme.en_US
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