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Recently, researcher Yu Xuefeng of the Institute of Advanced Technology of the Chinese Academy of Sciences Shenzhen Institute of Technology collaborated with Professor Zhu Jianhao of the City University of Hong Kong and Professor Zhang Jian of the Shenzhen University, and successfully developed a new type of ultra-small black phosphorus quantum dot by members of the research group Sun Zhengbo and Xie Hanhan. Photothermal therapy for tumors. The related paper "Ultrasmall Black Phosphorus Quantum Dots: Synthesis and Use as Photothermal Agents (DOI: 10.1002/anie.201506154) has been applied by Angew. Chem. Int. Ed. ) Cover Story and was named Hot Paper.
Two-dimensional layered materials, such as graphene and transition metal sulfides (TMDs), have become promising nanomaterials for basic research and potential applications because of their excellent properties. Inspired by the unique two-dimensional nature of graphene and TMDs, the conceptual new layered material of black phosphorus has recently attracted great interest from researchers around the world. Phosphorus is the fifteenth element in the periodic table, and its compounds usually have chemiluminescent properties, or produce athermal light through chemical reaction. Black phosphorus is a black inert allotrope obtained by high temperature and pressure of white phosphorus. It has a similar waveform layer structure but differs from that of graphene sheets, and has a semiconductor gap that graphene does not have. What's more important is that its semiconductor band gap is a direct band gap, that is, the bottom of the electronic conduction band (conductor) and the top of the non-conducting energy band (valence band) are in the same position, while the traditional silicon or molybdenum sulfide is indirect. Gap. This means that black phosphorus and light can be coupled directly, and the spectrum includes the entire visible to near-infrared region. Therefore, black phosphorus has unique advantages over graphene and other materials including silicon and molybdenum sulfide, and is very suitable for application. Optical field.
The research team conducted a pioneering study on this new type of two-dimensional material, and used a combination of probe ultrasonic and liquid bath ultrasonic stripping to control the preparation of two-dimensional layered black phosphorus quantum dots, resulting in a lateral dimension of approximately 2.6 nm. Monoatomic layer thickness black phosphorus quantum dots. By examining the optical properties of this ultrafine black phosphorus quantum dot and its effect on the survival rate of different cell lines, it was found that it exhibited excellent near-infrared optical performance with an extinction coefficient of 14.8 Lg-1cm-1 at 808 nm. The thermal conversion efficiency reached 28.4%, which can significantly kill tumor cells under the irradiation of near-infrared lasers, and exhibit good biocompatibility in various cell lines. The two-dimensional layered ultrafine black phosphorus quantum dots exhibit unique optical properties as another form of two-dimensional material, and because phosphorus is an essential element in vivo, it has unparalleled application in the biomedical field. The advantage of black phosphorus quantum dots has great potential as an efficient photothermal preparation for cancer treatment.
The study was funded by the National Natural Science Foundation of China, the Hong Kong Research Foundation’s Comprehensive Research Fund, the Hong Kong City University Strategic Research Fund and the Shenzhen Science and Technology Key Project.
What are the advantages of aluminum profile for cabinet and Shop Window Aluminium Frame
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The aluminum profile of the cabinet door is made of aluminum alloy frame inlaid with crystal steel plate. The aluminum alloy profile, ABS plastic parts and crystal steel plate are bubble resistant materials. Therefore, the aluminum profile of the cabinet door provides 50 years of waterproof guarantee, which can be directly washed and soaked with water.
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The aluminum profile of cabinet door has strong heat resistance. The test shows that it can withstand the temperature difference of 200 ℃ without damage. Even if the whole piece is placed on it after being ignited, its surface will not be damaged after burning for a long time, which overcomes the disadvantage that ordinary plates can not stand burning.
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The surface of aluminum profile of cabinet door is not damaged by knife cutting. It can be used under normal conditions for 50 years.
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