Active mixing printhead nozzles with rotary thrusters, each entering the narrow mixing chamber through various inlets and mixing instantaneously with the rotating leaf.
3D printing is a revolution in the production of lightweight structures, flexible robots and flexible electronics, but it is still difficult to print complex, multi-material, integrated products. Recently, scientists at Harvard University in the United States designed a new multi-material printhead that mixes and prints concentrated, viscoelastic "ink" materials that control both composition and geometry in the printing process. The printheads change the composition of the material during operation through an actively mixed, fast-switching nozzle that paves the way for full 3D printed wearable and electronic devices.
To print a device that contains both soft and stiff electronic components that move with your knees, the ideal 3D printer should be able to seamlessly transition from soft materials to hard materials, circuit different inks, and resistors with different resistances, With the ability to precisely switch between inks and uninterrupted in performing all these tasks - the ability to integrate different materials and properties in print products is the next frontier in 3D printing.
The study was conducted by Jennifer Lewis, a professor of bionic engineering at the John Polson College of Engineering and Applied Science (SEAS) at Harvard University. According to the researchers, printing a variety of materials is based on mixing complex liquids, most of the previous method is passive, that is, two liquids diffusion mixing, high viscosity liquid, especially in small volume, short time is difficult to work . They designed an active hybrid multi-material printhead with a rotary propeller inside the micro-nozzle that effectively mixes a wide variety of complex liquids.
Thomas Oba, a postdoctoral fellow at the Weiss Institute at Harvard University, said: "Experiments have shown that active microfluidic mixers can mix multiple materials." The hybrid printheads they produce print multiple materials Three-dimensional pattern. For example, flexible silicones can be printed seamlessly into a gradient structure consisting of soft and hard areas, a structure that has numerous applications in flexible electronics and wearable devices. Reactive materials such as AB glue (two-part epoxy) can also be printed, quickly hardening when the two parts combine. In addition, conductive and resistive inks can be mixed as needed to embed circuits in 3D printed objects.
Related papers published in the recent United States "National Academy of Sciences" on.
Computer with a printer, the beginning is a needle - needles across the ribbon on the whiteboard knock out many points; later inkjet printers come out, the color of several ink cartridges can mix out true colors, and finally able to paint. 3D printer just invented, dry work is still slightly simple; the new model developed will be able to "cotton in the possession of needle" to spray the complex structure. Future improvements will make 3D printers truly capable of engravers and technologists.
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