Hu Liangbing's research group at the University of Maryland, USA, recently invented the world's first 3D printed micron furnace, the smallest known furnace so far, and its excellent performance offers the possibility of accurate heating at the micro-nano level and will help To promote thermal-related micro-nano science research and engineering applications.

The results recently published in the "American Chemical Society Nano" magazine. This furnace temperature can reach more than 2700 degrees Celsius, heating and cooling rate is up to 20,000 degrees Celsius per second. In contrast, conventional furnaces typically have a maximum temperature of less than 1500 degrees Celsius and a ramp rate of generally less than 100 degrees Celsius per minute. In addition, the huge cavity of the furnace makes it impossible to perform fine micro-nano heating.

Laser heating is a new type of heating technology that can heat a specific micron range, but the laser equipment is extremely expensive, and laser heating is only effective for the laser-absorbing material, it can only heat the surface, resulting in the temperature of the material is not heated All are serious.

Hu Liangbing group using the 3D printer 3D precise, rapid prototyping capabilities, design and preparation of micron-scale furnace, the characteristic size of 200 microns or less, approximate the hair, and is expected to continue to decline. Compared with other 3D printing inks, the graphene oxide is an aqueous solution of high-concentration graphene oxide. The graphene oxide is safe and stable, is simple and cheap to prepare, and does not cause environmental pollution due to the water solvent. It is suitable for large-scale production.

Work, through the input of different power signals, the use of Joule heat can be fine on this micron-scale furnace temperature control. Graphene oxide is converted to a graphene-like structure upon heating. Its carbon-carbon covalent bond ensures thermodynamic stability and can therefore easily be warmed to over 2700 ° C. Miniaturized furnaces can quickly collect heat, making super-rapid heating possible, and the entire heating process can be completed in 100 milliseconds.

The first author, University of Maryland, doctoral candidate Yao Yonggang said that the use of 3D printing technology to prepare micron furnace, its performance, fast forming, and low preparation costs, micro and nano science and engineering research provides a great advantage Of the heating means, to promote the new micro-nano material properties, especially the study of thermal-related properties possible.

Micro-nano technology is the frontier and hot point of modern scientific research. However, to study the physical properties and chemical reactions of micro-nano materials, especially the characterization and preparation of temperature-dependent materials, we must first develop devices suitable for micro-nano heating and require them to heat specific micro / nano-scale regions while heating The temperature range and heating rate also need fine tuning.

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