Entering a New Dimension in Powder Processing for Advanced Ceramics Shaping

Sänger, Johanna C.; Pauw, Brian R.; Riechers, Birte; Zocca, Andrea; Rosalie, Julian M.; Maaß, R.; Sturm, Heinz; Günster, Jens

doi:10.1002/adma.202208653

Cited by 15 publications

(14 citation statements)

References 46 publications

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“…Further details on the fabrication and sintering process for substrate and microblocks are provided elsewhere. 7 All as-sintered, that is, pristine, and mechanically tested microblocks were assessed visually by means of scanning electron microscopy (SEM, EVO MA10, Carl Zeiss GmbH). To enhance the SEM-imaging conditions and to reduce electron-charging effects, as-sintered microblocks were gold-coated by sputter deposition previous to the SEM analysis.…”

Section: Methodsmentioning

confidence: 99%

“…7 Moreover, mechanical compression testing demonstrated strength levels for 2PP-zirconia ceramics sintered at 1200 • C that can compete with bulk zirconia even when printed with designed porosity. 7 These findings indicate a strong benefit from using nanosized particles on the mechanical performance of 2PP-zirconia, underlining earlier results that reveal access to favorable transgranular fracture modes and grain-boundary reinforcements with decreasing particle size as shown for Al 2 O 3 . 13 A major advantage of 2PP-AM is the ability to construct geometries with a resolution and contour accuracy that cannot be achieved with conventional AM technologies.…”

Section: Introductionmentioning

confidence: 98%

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Microplastic response of 2PP‐printed ceramics

Sänger,

Riechers,

Pauw

et al. 2024

J Am Ceram Soc.

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Two‐photon polymerization (2PP) additive manufacturing (AM) utilizes feedstocks of ceramic nanoparticles of a few nanometers in diameter, enabling the fabrication of highly accurate technical ceramic design with structural details as small as 500 nm. The performance of these materials is expected to differ from conventional AM ceramics, as nanoparticles and three‐dimensional printing at high resolution introduce new microstructural aspects. This study applies 2PP‐AM of yttria‐stabilized zirconia to investigate the mechanical response behavior under compressive load, probing the influence of smallest structural units induced by the line packing during the printing process, design of sintered microblocks, and sintering temperature and thereby microstructure. We find a dissipative mechanical response enhanced by sintering at lower temperatures than conventional. The pursued 2PP‐AM approach yields a microstructured material with an increased number of grain boundaries that proposedly play a major role in facilitating energy dissipation within the here printed ceramic material. This microplastic response is further triggered by the filigree structures induced by hollow line packing at the order of the critical defect size of ceramics. Together, these unique aspects made accessible by the 2PP‐AM approach contribute to a heterogeneous nano‐ and microstructure, and hint toward opportunities for tailoring the mechanical response in future ceramic applications.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Microplastic response of 2PP‐printed ceramics

Sänger,

Riechers,

Pauw

et al. 2024

J Am Ceram Soc.

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“…Submicron spatial resolution can be attained via two-photon polymerization (2PP), a laser-based direct writing technology in which a photocurable resin initiates free radical polymerization by simultaneously absorbing two photons (16,17). However, 2PP enabled AM is predominantly employed for organic materials as it requires a high precursor transparency to the activating radiation in order to initiate the reaction-a characteristic not typically inherent to ceramic suspension-based feedstocks as the light scattering by solid phases in a resin reduces the photon density (18)(19)(20)(21).…”

Section: Mainmentioning

confidence: 99%

3D-printing of calcium phosphates at nanoscale resolution

Zreiqat,

Roohani,

Wang

et al. 2024

Preprint

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Calcium phosphates (CaPs) are ubiquitous in biological structures, such as vertebrate bones and teeth, and have diverse biomedical applications. Shaping CaPs at the nanoscale in 3D can unlock new possibilities in a myriad of research and industrial applications. However, fabricating inorganic materials such as CaPs with designed 3D nanostructures remains a significant challenge. Here, we introduce a novel approach to 3D print CaP structures with unprecedented sub-300 nm resolution, achieving a level of detail three orders of magnitude finer than current state-of-the-art additive manufacturing techniques for CaPs. This advancement is achieved by leveraging a bioinspired chemistry using bone prenucleation clusters, within a photoresist. This technique also enables nanopatterning of CaPs on ceramics and metals, and precise engineering of the microstructure down to the level of a single nanograin. This method will offer new frontiers in developing bioinspired metamaterials, damage-tolerant lightweight materials, cell-modulating interfaces, precision-engineered coatings, and targeted drug delivery nanovehicles.

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“…In this way, transparent 3D silica structures have been obtained from 3D printed objects fabricated by this technique followed by burning organic residues at high temperatures (typically >1000 °C). [32][33][34][35][36][37] On a different scale, many functional micrometer-size systems have been fabricated from organosilane-, metal-based organic-inorganic sol-gel materials, [38][39][40][41][42] ceramics, [43][44][45] composites, [46] and ceramic aerogels [37] using the two-photon absorption induced direct-laser writing (2P-DLW), a high-resolution 3D printing technique. [47][48][49] Despite the high-resolution attained by 2P-DLW, preparation of large 3D printed surfaces remains an important issue.…”

Section: Introductionmentioning

confidence: 99%

Dual One and Two‐Photon Solvent‐Free Hybrid Photoresist for High‐Resolution and Grayscale 3D Microprinting

Chía Gómez,

Pitrat,

Bretonnière

et al. 2024

Adv Eng Mater

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Additive manufacturing holds a strong promise to revolutionize industry. Fabricating high‐resolution and large objects with specific physical properties remains a critical challenge. In this direction, innovation in both chemical processing and 3D‐printing techniques are needed. Here, a solvent‐free hybrid organic‐inorganic photoresist combining a radical photoinitiator and a photobase generator is photostructured by grayscale lithography and direct laser writing using both one‐ and two‐photon absorption. Infrared spectroscopy suggests that one‐photon absorption activates the photoinitiator and leads to radical polymerization of organic moieties, triggering silanol condensation in a synergetic way. In contrast, upon two‐photon absorption, the driving force of polymer formation is the photobase‐induced silanol condensation. The proposed approach produces both large area and high‐resolution 3D structures upon one‐ and two‐photon absorption induced polymerization, respectively. This new paradigm paves the way towards the efficient fabrication of on‐demand devices for personalized health care, microfluidics or microoptics.This article is protected by copyright. All rights reserved.

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Entering a New Dimension in Powder Processing for Advanced Ceramics Shaping

Cited by 15 publications

References 46 publications

Microplastic response of 2PP‐printed ceramics

Microplastic response of 2PP‐printed ceramics

3D-printing of calcium phosphates at nanoscale resolution

Dual One and Two‐Photon Solvent‐Free Hybrid Photoresist for High‐Resolution and Grayscale 3D Microprinting

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