C9 colleges and universities, doctoral students make a statement of nature!

In this paper, the source ： Harbin Institute of Technology News Network , edit ： Muge Academy

recently , Professor Li Huihe and Professor Xu Xiang from the school of civil engineering, Harbin Institute of technology have made important research achievements in the field of ceramic aerogel gel insulation . Beijing time. 6 month 29 Friday night , The research paper is based on 《 Semi crystalline ceramic aerogel extreme thermal insulation material 》（Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions） The title is published in 《 natural 》（Nature,2022 The annual influencing factors are 69.504） On . Li Hui 、 Professor Xu Xiang and Professor Duan Xiangfeng of the University of California, Los Angeles are co correspondents , Guojingran, doctoral student of Harbin Institute of Technology 、 Fu Shubin and Deng Yuanpeng are co first authors , Harbin Institute of technology is the first unit and communication unit .

Thesis link ：https://www.nature.com/articles/s41586-022-04784-0

Extreme conditions （ For example, complex mechanical loads and violent temperature changes in deep space and deep earth environments ） Thermal control under , The thermal insulation material is required to have excellent thermal - Mechanical properties and thermal insulation performance . Traditional ceramic aerogel gel super thermal insulation materials have been plagued for nearly a century “ Force and heat are mutually exclusive ” Bottleneck problem , For example, amorphous toughening of ceramics leads to high-temperature crystallization and pulverization , The low thermal expansion effect is trapped in the structural geometry and mechanical properties , The synergistic enhancement of force and heat at the same time sacrifices the thermal insulation performance , And low density reduces phonon heat transfer and cannot effectively block high-temperature thermal radiation , It is difficult to meet the actual extreme environmental thermal control needs .

In view of this , This paper reports a method of designing and preparing multi-scale super structure of aerogel , Semi crystalline （hypocrystalline） Ceramic material design combination zig-zag Macro structural design , Endow ceramic aerogel with nearly zero Poisson's ratio （3.3×10-4） And near zero thermal expansion （1.2×10-7/℃） Of “ double zero ” Unconventional physical properties , Thus, light weight and super flexibility are obtained 、 High thermal stability and high temperature super insulation . meanwhile , The research team innovatively proposed a “ Gas turbulence ” The method of directly preparing three-dimensional nanofiber ceramic aerogel by assisted electrospinning , It expands the bondage of traditional electrospinning to prepare two-dimensional membrane materials , In order to realize the multi-scale superstructure design of materials 、 High performance 、 Large scale and low-cost preparation provides new ideas and new methods . The elasticity of the material can recover the compressive strain up to 95%, Excellent stretch （ Fracture strain >40%） And bending （ Bending strain >90%） Deformability ;1 Ten thousand high-frequency violent thermal shocks （ about 200℃/s） And long-term high temperature （>1000℃） Strength loss and volume shrinkage are almost zero under aerobic exposure ; Besides , Semicrystalline ceramics show a stronger coating ability for carbon , It improves the high temperature oxidation resistance of carbon materials , Thus, the high-temperature heat radiation is effectively blocked , Realized “ Low density ” Ceramic aerogel has the lowest thermal conductivity at high temperature （20mg/cm3、1000℃ Lower than 100mW/mK）, It makes up for the shortcomings of lightweight aerogel gel materials in the field of high temperature insulation . The material also has capacitive self sensing properties , It can monitor the structural damage of thermal insulation materials in real time , The safety and reliability of the thermal control system are further enhanced .

The research was conducted by professors Xu Xiang and Li Hui 2019 Published in 《 science 》（Science,2019,363,723-727） The article 《 Double negative ceramic aerogel super insulating material 》 The extension of work , It has won the innovative research group and general projects of the National Natural Science Foundation of China 、 The support of Heilongjiang Touyan action talent plan and the young top professors plan of Harbin Institute of Technology , The results are extremely important to meet the needs of China's aerospace and other fields 、 Thermal insulation under complex service conditions 、 Weight loss and capacity increase 、 Saving energy and reducing consumption 、 The system is safe and stable , It has important scientific significance and practical value .

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