Freeze‐cast honeycomb structures via gravity‐enhanced convection

Arai, Naoto; Faber, K. T.

doi:10.1111/jace.17871

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…However, these conventional processing techniques offer a limited range of achievable pore morphologies, pore directionality, and pore window size distribution. Solution-based freeze-casting arises as a flexible sacrificial templating method that allows the creation of a wider range of pore structures [ 15 , 31 ]. This process starts with dissolving a preceramic polymer in an organic solvent followed by freezing this polymer solution.…”

Section: Introductionmentioning

confidence: 99%

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

et al. 2023

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The development of porous ceramic screens with high chemical stability, low density, and thermal conductivity can lead to promising screen channel liquid acquisition devices (SC-LADs) for propellant management under microgravity conditions in the future. Therefore, SiOC screens with aligned pores were fabricated via freeze-casting and applied as a SC-LAD. The pore window sizes and open porosity varied from 6 µm to 43 µm and 65 % or 79 %, depending on the freezing temperature or the solid loading, respectively. The pore window size distributions and bubble point tests indicate crack-free screens. On the one hand, SC-LADs with an open porosity of 79 % removed gas-free liquid up to a volumetric flow rate of 4 mL s−1. On the other hand, SC-LADs with an open porosity of 65 % were limited to 2 mL s−1 as the pressure drop across these screens was relatively higher. SC-LADs with the same open porosity but smaller pore window sizes showed a higher pressure drop across the screen and bubble ingestion at higher values of effective screen area when increasing the applied removal volumetric flow rate. The removed liquid from the SC-LADs was particle-free, thus representing a potential for applications in a harsh chemical environment or broad-range temperatures.

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Section: Introductionmentioning

confidence: 99%

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

et al. 2023

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Gradient-controlled freeze casting of preceramic polymers

Arai

Faber

2023

Journal of the European Ceramic Society

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Prediction of directional solidification in freeze casting of biomaterial scaffolds using physics-informed neural networks

Rouhollahi,

Rismanian,

Ebrahimi

et al. 2024

Biomed. Phys. Eng. Express

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Freeze casting, a manufacturing technique widely applied in biomedical fields for fabricating biomaterial scaffolds, poses challenges for predicting directional solidification due to its highly nonlinear behavior and complex interplay of process parameters. Conventional numerical methods, such as computational fluid dynamics (CFD), require adequate and accurate boundary condition knowledge, limiting their utility in real-world transient solidification applications due to technical limitations. In this study, we address this challenge by developing a physics-informed neural networks (PINNs) model to predict directional solidification in freeze-casting processes. The PINNs model integrates physical constraints with neural network predictions, requiring significantly fewer predetermined boundary conditions compared to CFD. Through a comparison with CFD simulations, the PINNs model demonstrates comparable accuracy in predicting temperature distribution and solidification patterns. This promising model achieves such a performance with only 5000 data points in space and time, equivalent to 250,000 timesteps, showcasing its ability to predict solidification dynamics with high accuracy. The study’s major contributions lie in providing insights into solidification patterns during freeze-casting scaffold fabrication, facilitating the design of biomaterial scaffolds with finely tuned microstructures essential for various tissue engineering applications. Furthermore, the reduced computational demands of the PINNs model offer potential cost and time savings in scaffold fabrication, promising advancements in biomedical engineering research and development.

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Freeze‐cast honeycomb structures via gravity‐enhanced convection

Cited by 3 publications

References 24 publications

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

Gradient-controlled freeze casting of preceramic polymers

Prediction of directional solidification in freeze casting of biomaterial scaffolds using physics-informed neural networks

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