Recently, researchers at the Karlsruhe Institute of Technology (KIT) in southwestern Germany have developed an erasable 3D printing ink. The innovation focuses on direct laser writing: a 3D printing technology that produces micron-sized structures with precisely defined properties. According to KIT, it is now possible to repeatedly erase and reconstruct small structures up to 100 nanometers (one nanometer corresponds to one millionth of a meter).
Professor Christopher Barner-Kowollik of the KIT Institute of Chemical Technology and Polymer Chemistry said: "Developing re-cancellable inks is one of the major challenges of direct laser writing." For users who are not familiar with direct laser writing, the process Mainly around a computer controlled highly focused laser beam that produces a structure in a photoresist (photosensitive material). Now, KIT scientists have developed an "ink" with reversible bonding, meaning that the components of the material can be separated from one another. By immersing the printed structure in a chemical solvent, the material is erased, allowing new structures to be written. Erase is not limited to one use, and using the KIT method means that the structure can now be modified repeatedly. This groundbreaking research has been closely coordinated with the KIT Institute of Applied Physics and the Nanotechnology Institute, led by Professor Martin Wegener. After several months of development, the team developed a dedicated 3D printer that can produce scaffolding up to 100nm by direct laser writing of new ink. Markus Zieger, Ph.D. student and Principal Investigator, said: "Ink with a defined break point can be used in a variety of applications. This development is expected to be particularly valuable in the fields of biology and materials science, where it can open up countless new possibilities. The structure of the erasable ink write can be integrated into structures made with non-erasable 3D printing inks." Now, KIT researchers have been testing their new innovations in biological laboratories. In particular, with the development of 3D designer culture dishes, cell cultures can grow in three dimensions on a laboratory scale. Wegener explained: "In order to study how cells respond to environmental changes, parts of the 3D reconstruction scaffold can be removed again."
According to the KIT team, future applications may include reversible wire bonding from erasable conductive structures. Print materials can be made more or less, for example by mixing permanent inks with non-permanent inks, which is just the tip of the iceberg. Wegener predicts that 10% of the products will be produced by 3D printing within 15 years. It is reported that the study was published in the latest issue of the German academic journal Angewandte Chemie, entitled "Cleaving Direct Laser Written Microstructures on Demand." The commentator has rated the publication as a very important paper, and its application will play in the future, but Xiaobian believes it should be groundbreaking.
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