Complex ceramic architectures by directed assembly of ‘responsive’ particles

Garcı́a-Tuñón, Esther; Machado, Gil Costa; Schneider, Marc; Barg, Suelen; Bell, Robert V.; Saiz, Eduardo

doi:10.1016/j.jeurceramsoc.2016.06.050

Cited by 10 publications

(12 citation statements)

References 51 publications

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“…We propose that at this pH range (pastes exhibit pH values between 5 and 6), non-covalent interactions such as hydrogen bonds (flake to flake and flake to particle) may be playing an important role. 12,41 The structures built using the platelet/GO paste exhibit good handling strength once dry and before sintering. The GO/platelet interactions are strong enough to hold the structure together without particle debris.…”

Section: D Printing Of Particulate Systems Using Go As Printing Addimentioning

confidence: 99%

Graphene Oxide: An All-in-One Processing Additive for 3D Printing

Garcı́a-Tuñón

Feilden

Zheng

et al. 2017

ACS Appl. Mater. Interfaces

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Many 3D printing technologies are based on the development of inks and pastes to build objects through droplet or filament deposition (the latter also known as continuous extrusion, robocasting, or direct ink writing). Controlling and tuning rheological behavior is key for successful manufacturing using these techniques. Different formulations have been proposed, but the search continues for approaches that are clean, flexible, robust and that can be adapted to a wide range of materials. Here, we show how graphene oxide (GO) enables the formulation of water-based pastes to print a wide variety of materials (polymers, ceramics, and steel) using robocasting. This work combines flow and oscillatory rheology to provide further insights into the rheological behavior of suspensions combining GO with other materials. Graphene oxide can be used to manipulate the viscoelastic response, enabling the formulation of pastes with excellent printing behavior that combine shear thinning flow and a fast recovery of their elastic properties. These inks do not contain other additives, only GO and the material of interest. As a proof of concept, we demonstrate the 3D printing of additive-free graphene oxide structures as well as polymers, ceramics, and steel. Due to its amphiphilic nature and 2D structure, graphene oxide plays multiple roles, behaving as a dispersant, viscosifier, and binder. It stabilizes suspensions of different powders, modifies the flow and viscoelasticity of materials with different chemistries, particle sizes and shapes, and binds the particles together, providing green strength for manual handling. This approach enables printing complex 3D ceramic structures using robocasting with similar properties to alternative formulations, thus demonstrating the potential of using 2D colloids in materials manufacturing.

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Section: D Printing Of Particulate Systems Using Go As Printing Addimentioning

confidence: 99%

Graphene Oxide: An All-in-One Processing Additive for 3D Printing

Garcı́a-Tuñón

Feilden

Zheng

et al. 2017

ACS Appl. Mater. Interfaces

Self Cite

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“…In direct foaming [13] air bubbles are incorporated into highly loaded slurries, either by mechanical frothing or direct gas injection. Alternatively, multiple direct foaming techniques based on the emulsification of a polymer phase within a ceramic powder suspension have been recently developed [14][15][16]. Reticulated ceramics with moderate to high porosity and partially open pore space have also been obtained.…”

Section: Introductionmentioning

confidence: 99%

Processing of Macroporous Alumina Ceramics Using Pre-Expanded Polymer Microspheres as Sacrificial Template

Oset

Nordin²,

Akhtar

2018

Ceramics

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Shaped porous ceramics have proven to be the most adapted materials for several industrial applications, both at low and high temperatures. Recent research has been focused on developing shaping techniques, allowing for a better control over the total porosity and the pores characteristics. In this study, macroporous alumina foams were fabricated by gel-casting using pre-expanded polymeric microspheres with average sizes of 40 μm, 20 μm, and 12 μm as sacrificial templates. The gel-casting method, as well as the drying, debinding, and presintering conditions were investigated and optimized to process mechanically strong and highly porous alumina scaffolds. Furthermore, a reliable model relating the amount of pre-expanded polymeric microspheres and the total porosity of the presintered foams was developed and validated by mercury intrusion porosimetry measurements. The electron microscopy investigation of the presintered foams revealed that the size distribution and the shape of the pores could be tailored by controlling the particle size distribution and the shape of the wet pre-expanded microspheres. Highly uniform and mechanically stable alumina foams with bimodal porosity ranging from 65.7 to 80.2 vol. % were processed, achieving compressive strengths from 3.3 MPa to 43.6 MPa. Given the relatively open pore structure, the pore size distribution, the presintered mechanical strength, and the high porosity achieved, the produced alumina foams could potentially be used as support structures for separation, catalytic, and filtration applications.

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“…(A) Summary of particle‐stabilized emulsion processing conditions to alter the final microstructure (Reproduced from with permission Elsevier, Copyright 2017), (B) Image of bulk alumina/zirconia foam prepared from alumina‐zirconia mixture with SDS surfactant by 1500°C sintering. SEM images showing (C) general view of closed porosity microstructure, (D) closed magnification view of polyhedral cells, and (E) thin strut detail (Reproduced from with permission Elsevier, Copyright 2019)…”

Section: Processing Strategiesmentioning

confidence: 99%

Closed porosity ceramics and glasses

2020

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In the last three decades, considerable effort has been devoted to obtain both open and closed porosity ceramics & glasses in order to benefit from unique combination of properties such as mechanical strength, thermal and chemical stability at low‐relative density. Most of these investigations were directed to the production and the analysis of the properties for open porosity materials, and regrettably quite a few compositions and manufacturing methods were documented for closed porosity ceramics & glasses in the scientific literature so far. This review focuses on the processing strategies, the properties and the applications of closed porosity ceramics & glasses with total porosity higher than 25%. The ones below such level are intentionally left out and the paper is set out to demonstrate the porous components with deliberately generated closed pores/cells. The processing strategies are categorized into five different groups, namely sacrificial templating, high‐temperature bonding of hollow structures, casting, direct foaming, and emulsions. The principles underlying these methods are given, with particular emphasis on the critical issues that affect the pore characteristics, mechanical, thermal and electrical properties of the produced components.

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Complex ceramic architectures by directed assembly of ‘responsive’ particles

Cited by 10 publications

References 51 publications

Graphene Oxide: An All-in-One Processing Additive for 3D Printing

Graphene Oxide: An All-in-One Processing Additive for 3D Printing

Processing of Macroporous Alumina Ceramics Using Pre-Expanded Polymer Microspheres as Sacrificial Template

Closed porosity ceramics and glasses

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