Fig. 8.
The effect of using an alternative working fluid on pressure requirements. The use of lower viscosity fluids (in the same geometry used by Breslauer with a no-slip wall condition) reduces the pressure required compared to fibroin (black: η 0 = 1700 Pa s) when the working fluid is sericin (orange dashes: η 0 = 7.6 Pa s; orange line: ± order of magnitude variation), or water (blue: η = 8.9 x10−4 Pa s). Water only just reaches the biological extrusion domain, with the higher natural spinning speeds remaining unattainable. The biological extrusion domain is split into natural (dark green dashes) and forced (pale green dashes) spinning domains