Page 108 - IJB-9-2

International Journal of Bioprinting Holistic charge-based MEW scaffold model

A B C

D E

Figure 8. Energy surface and lateral characteristic curves for parallel walls. (A) Schematic of “fiber bridging” phenomenon observed in printing parallel
fibrous walls. (B) Energy surface at z = 5. (C) Energy surface at z = 2. The black curves show the lateral characteristic curves. (D) and (E) show the
dependence of the lateral characteristic curves on β. For (B–E), α = 3, ξ = 5, η = 1, and K = 3. β = 0.5 for (B) and (C).

result in an increasingly significant lateral deviation (“fiber polarization effect. Based on this classification, the typical
bridging”). Therefore, as N increases, the jet is more likely modes of energy surface evolution are identified. As useful
to deviate to the adjacent wall and cannot be corrected representations to analyze these modes, the concepts of
back (Figure 8D and E). This explains the increase of the lateral characteristic curve and characteristic surface are
minimum achievable S /d with N. A larger d inhibits charge introduced to clarify the complex interplay between the
f
f
f
dissipation, which results in an increase in β. Therefore, the fiber morphologies and the residual charge. Different
initial lateral deviation caused by the global effect becomes process and design parameters factor into this interplay by
less significant (Figure 8D), which explains the decrease in affecting fiber morphologies, residual charge amount, or
the minimum achievable S /d with fiber diameter. these three charge effects.
f f
4. Conclusion To validate this model, the effects of some parameters
on fiber morphologies are systematically investigated,
In this work, an analytical model based on charge including lateral location and grid number. Moreover,
polarization and energy analysis was established. As the the “fiber bridging” phenomenon in parallel fiber
fiber material jet deposition proceeds, the energy surface printing is successfully explained. These results help
assumes different patterns, which constitute modes of to comprehensively understand the complex interplay
evolution. The ways in which different parameters affect between the fiber morphologies and residual charge, thus
the modes of evolution are classified according to three providing systematic solutions to mitigate the structural
charge effects, including the global effect, local effect, and disorder due to residual charge accumulation.

Volume 9 Issue 2 (2022) 100 https://doi.org/10.18063/ijb.v9i2.656