Exploring the design space of the effective thermal conductivity, permeability, and stiffness of high-porosity foams

Stallard, Silven; Jiang, Huan; Chen, Yanyu; Bergman, Theodore L.; Li, Xianglin

doi:10.1016/j.matdes.2023.112027

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…This can be attributed the lower fluid permeability of stochastic lattices compared to periodic S4). Frontiers in Bioengineering and Biotechnology frontiersin.org 10 lattices (Stallard et al, 2023). And the difference in permeability has shown to originate from the increased tortuosity in stochastic microarchitectures (like the trabecular bone) compared to periodic ones (Prakoso et al, 2023).…”

Section: Comparing the Biological Performance Among Designsmentioning

confidence: 99%

The effect of nodal connectivity and strut density within stochastic titanium scaffolds on osteogenesis

Kechagias,

Theodoridis,

Broomfield

et al. 2023

Front. Bioeng. Biotechnol.

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Modern orthopaedic implants use lattice structures that act as 3D scaffolds to enhance bone growth into and around implants. Stochastic scaffolds are of particular interest as they mimic the architecture of trabecular bone and can combine isotropic properties and adjustable structure. The existing research mainly concentrates on controlling the mechanical and biological performance of periodic lattices by adjusting pore size and shape. Still, less is known on how we can control the performance of stochastic lattices through their design parameters: nodal connectivity, strut density and strut thickness. To elucidate this, four lattice structures were evaluated with varied strut densities and connectivity, hence different local geometry and mechanical properties: low apparent modulus, high apparent modulus, and two with near-identical modulus. Pre-osteoblast murine cells were seeded on scaffolds and cultured in vitro for 28 days. Cell adhesion, proliferation and differentiation were evaluated. Additionally, the expression levels of key osteogenic biomarkers were used to assess the effect of each design parameter on the quality of newly formed tissue. The main finding was that increasing connectivity increased the rate of osteoblast maturation, tissue formation and mineralisation. In detail, doubling the connectivity, over fixed strut density, increased collagen type-I by 140%, increased osteopontin by 130% and osteocalcin by 110%. This was attributed to the increased number of acute angles formed by the numerous connected struts, which facilitated the organization of cells and accelerated the cell cycle. Overall, increasing connectivity and adjusting strut density is a novel technique to design stochastic structures which combine a broad range of biomimetic properties and rapid ossification.

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Section: Comparing the Biological Performance Among Designsmentioning

confidence: 99%

The effect of nodal connectivity and strut density within stochastic titanium scaffolds on osteogenesis

Kechagias,

Theodoridis,

Broomfield

et al. 2023

Front. Bioeng. Biotechnol.

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Thermo‐Mechanical Study on Auxetic Shape Memory Periodic Open Cellular Structures—Part I: Characterization of Reentrant Geometry and Effective Heat Conductivity

Rudolf,

Fink,

Körner

et al. 2024

Adv Eng Mater

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Periodic open cellular structures (POCS) are additively manufactured supports for heterogeneous catalysts in the field of chemical reaction engineering. Constructed from a repeated unit cell, POCS offer excellent heat transport characteristics due to heat conduction in the continuous solid matrix. However, when inserted into tubular reactors, a loose fit between structure and tube wall results. This considerably hinders heat transfer across the wall. The novel POCS concept presented in this work aims at an intensified wall heat transfer by utilizing a reentrant structure design to ensure auxetic behavior. If the POCS is made of shape memory alloy, it can recover its original shape. Combining these two effects with an initial radial oversize, an interference fit with the tube is established. This contribution comprises the geometric description of reentrant POCS and heat conduction simulations for characterization of the effective heat conductivity, yielding scaling correlations dependent on geometric parameters. Moreover, the effective radial heat conductivity of POCS in cylindrical shape is explicitly investigated. The influencing factor identified is the ratio of tube diameter and cell size: while the ratio increases, the effective radial heat conductivity decreases, but remains well above the effective heat conductivity of the unit cell.

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Spacesuit Textiles from Extreme Fabric Materials: Aromatic Amide Polymer and Boron Nitride Nanotube Composite Fiber for Neutron Shielding and Thermal Management

Ryu,

Kang,

Kim

et al. 2024

Adv. Fiber Mater.

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Exploring the design space of the effective thermal conductivity, permeability, and stiffness of high-porosity foams

Cited by 6 publications

References 28 publications

The effect of nodal connectivity and strut density within stochastic titanium scaffolds on osteogenesis

The effect of nodal connectivity and strut density within stochastic titanium scaffolds on osteogenesis

Thermo‐Mechanical Study on Auxetic Shape Memory Periodic Open Cellular Structures—Part I: Characterization of Reentrant Geometry and Effective Heat Conductivity

Spacesuit Textiles from Extreme Fabric Materials: Aromatic Amide Polymer and Boron Nitride Nanotube Composite Fiber for Neutron Shielding and Thermal Management

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