The reporter learned from the University of Science and Technology of China on the 22nd that the academician Yu Shuhong's team and its collaborators used the liquid crystal behavior and gelation ability of graphene oxide for the first time to obtain a gel with a ring-shaped polar structure. According to the microstructure of the gel To reveal the fluid behavior in hydrothermal synthesis. The result was published in the famous journal "Substance".
In the past 100 years, hydrothermal synthesis has been widely used and developed, and has become a common method for synthesizing various materials such as single crystals, metal oxides, ceramics and nanocomposites. However, the information available in hydrothermal synthesis is limited to input raw materials, output products, and reaction conditions. It is unclear how the processes in closed system reactions occur. In order to effectively control the quality of hydrothermal synthesis products, it is particularly important to understand and understand the heat and mass transfer process. Therefore, how to open this "black box" has become a challenge in the field of hydrothermal synthesis research.
The researchers found that under hydrothermal conditions, graphene oxide nanosheets can be aligned along the direction of the flow field under the action of fluid shear. In addition, graphene oxide nanosheets can be fixed in situ by cross-linking with phenolic resin to form an axisymmetric gel with a ring structure. Researchers can infer the fluid behavior in hydrothermal synthesis through direct observation and analysis of gel morphology and structure. Based on this, the researchers carried out research on multiple factors such as heating temperature, solution viscosity and reactor size / morphology.
The results show that for a specific reaction, the temperature difference and the size of the reactor lining are the most important factors affecting convection. The larger the volume of the reactor, the more uneven the heat transfer of the reaction liquid, and the greater the temperature difference, the stronger the convection. The effect of enhancing convection is the same as that of mechanical disturbance, and the uniformity of the product becomes poor, especially it will have a non-negligible effect on the large-scale synthesis of nanowires, nanosheets or bulk gel materials using hydrothermal methods. More impurities are generated or the internal structure of the three-dimensional block is uneven. (Reporter Wu Changfeng)
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