It was found that the geometry of the reaction vessel can affect the growth of nanostructures!

Magnetic Nanocomposites (such as iron oxide) have attracted special attention because their synthesis can be guided by magnetic field For iron carbide, the introduction of carbon atoms makes it very stable, and has a high application prospect in biological imaging, magnetic storage and energy conversion However, due to the difficulty of synthesis and function adjustment, its research is far inferior to iron oxide In order to improve and adjust the function of Magnetic Nanocomposites, it is very important to control their shape and structure, especially to obtain tubular nanostructures, which has become an effective substrate for the growth of functional heterogeneity and composite nanostructures For the commonly used solid-state reaction, there are few adjustable parameters that can change the reaction process and product growth, usually only temperature, time, gas and so on Recently, the research group of Lu light uranium of the strong magnetic field science center of the Chinese Academy of Sciences, together with the research group of Lu light iridium of Nanjing University and the peak research group of Nanjing University, designed a super insulated high temperature reaction system which can be directly inserted into the liquid helium with narrow low temperature aperture of the strong superconducting magnet, and used it to study the growth process of the nanostructure under the strong magnetic field It was found unexpectedly The spatial shape of the reaction vessel has an independent and decisive influence on the growth of nanostructures and even the process of chemical reactions The precursor of bimetallic sheet was decomposed into FEC nanoparticles @ zncn 2 nanotubes composite at 600 ° C and austenite / Fe nanoparticles @ CNTs composite at 900 ° C, which was different from the oxide products obtained in conventional ceramic boat Furthermore, the effects of the length diameter ratio of the reactor on the chemical reaction were studied ZnO / Fe3O4 nanoparticles, Fe3O4 @ ZnO nanotube array and FEC @ zncn 2 nanotube array were obtained in different length diameter ratio vessels Researchers can even draw a "phase diagram" of the reaction product according to different "geometric parameters" of the reaction vessel Schematic diagram of reaction process in reaction vessel with different length diameter ratio (source: Composites Part B: Engineering) this study proves that the geometry of reaction vessel is also an independently adjustable thermodynamic parameter, which can be used to control the process of chemical reaction and nanostructure growth This will bring new possibilities for the synthesis of new materials in the future This work was published in Composites Part B: Engineering (Composites Part B: Engineering, 2019, 161, 328-335) under the title of "space defined growth of new self supporting carbon based nanotube composites" This work was supported by the Ministry of science and technology, the National Natural Science Foundation of China, the Hefei Science Center of the Chinese Academy of Sciences, the special project of scientific instruments of the Chinese Academy of Sciences and the superior discipline of Jiangsu higher education.