| Recently, MIT researchers Hyunwoo Yuk and Xuanhe Zhao reported a new strategy in Advanced Materials to overcome the limitations associated with direct ink writing, which is common in 3D printing Manufacturing method.  In conventional direct ink writing (DIW), the nozzle tip moves at a certain height (H) and velocity (V) while depositing the viscoelastic ink fibers.The nozzle tip is moved at a speed set to such a value that the ink is extruded Speed, so that the resolution of the printed fiber is limited by the nozzle diameter. Researchers have devised a device that enables six new DIW 3D printing modes to produce complex patterns, including non-linear, continuous and discontinuous patterns. A single nozzle can print a much smaller So as to significantly increase the resolution of the print fiber.Quantitative phase diagrams with dimensionless nozzle velocity (V *) and height (H *) can be constructed to illustrate different print mode conditions and to test for different values of velocity and height parameters , Make it consistent with the phase diagram. Using experimental data and silicone elastomeric inks, different print patterns and fiber diameters can be 'programmed' by changing nozzle speed and height, continuously changing the nozzle speed from 0.3 to 2.5 and the height from 5 to 2 to allow uninterrupted Print mode and diameter print a single fiber. Three-dimensional solid pyramids with different resolutions and layer thicknesses can be printed in different modes using this method, and other viscoelastic inks, such as hydrogel inks, are also suitable for this new printing strategy with appropriate print parameters. Gradients can even be introduced on different layers of the 3D lattice structure, with each layer having a different pattern and fiber diameter.When a gradient 3D mesh actuator with two different diameters is placed in tetrahydrofuran, it shows a different Swelling times indicate that structures with different kinetic properties can be printed. |
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