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Enabling High-Performance Sodium Battery Anodes by Complete Reduction of Graphene Oxide and Cooperative In-situ Crystallization of Ultrafine SnO_(2)Nanocrystals

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Energy & Environmental Materials 2023年第3期6卷 356-365页

作者： Junwu Sang Kangli Liu Xiangdan Zhang Shijie Zhang Guoqin Cao Yonglong Shen Guosheng Shao School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Centre for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) XingyangZhengzhou 450100China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001China

The main bottleneck against industrial utilization of sodium ion batteries(SIBs)is the lack of high-capacity electrodes to rival those of the benchmark lithium ion batteries(LIBs).Here in this work,we have developed an economical method for in situ fabrication of nanocomposites made of crystalline few-layer graphene sheets loaded with ultrafine SnO_(2)nanocrystals,using short exposure of microwave to xerogel of graphene oxide(GO)and tin tetrachloride containing minute catalyzing dispersoids of chemically reduced GO(RGO).The resultant nanocomposites(SnO_(2)@MWG)enabled significantly quickened redox processes as SIB anode,which led to remarkable full anode-specific capacity reaching 538 mAh g^(−1)at 0.05 A g^(−1)(about 1.45 times of the theoretical capacity of graphite for the LIB),in addition to outstanding rate performance over prolonged charge–discharge cycling.Anodes based on the optimized SnO_(2)@MWG delivered stable performance over 2000 cycles even at a high current density of 5 A g^(−1),and capacity retention of over 70.4%was maintained at a high areal loading of 3.4 mg cm^(−2),highly desirable for high energy density SIBs to rival the current benchmark LIBs.

关键词： in situ compositing microwave reduced graphene oxide sodium ion battery sodium ion battery anode ultrafine SnO_(2)nanocrystals

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PREPARATION OF CHITOSAN/HYDROXYAPATITE GUIDED MEMBRANE USED FOR PERIODONTAL TISSUE REGENERATION

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Chinese Journal of Polymer Science 2010年第4期28卷 555-561页

作者：胡巧玲 Institute of Biomedical Macromolecules Department of Polymer Science and EngineeringKey Laboratory of Macromolecule Synthesis and FunctionalizationMinistry of EducationZhejiang University

In an effort to develop biomaterials to meet guided tissue regeneration （GTR） standards for periodontal tissue recovery, a homogeneous and transparent chitosan （CS）/hydroxyapatite （HA） membrane with potential applications as GTR barrier in periodontal therapy has been prepared via in situ compositing. The membrane has been designed to have a smoothrough asymmetric structure that meets the demand for GTR. Component and morphology of the membrane are characterized by XRD and SEM. It can be indicated that HA was in situ synthesized uniformly in the CS membrane. Mechanical experiments of the membranes with various HA contents show that their tensile strengths are adequate for periodontal therapy. Biological properties of the membrane have been performed by cell toxicity assays, hemolysis tests and animal experiments. Results indicate that the membrane has good biocompatibility and inductive effect for cell growth. Therefore this membrane can be potentially applied as GTR barrier membrane for periodontal tissue regeneration.

关键词： Chitosan membrane Hydroxyapatite in situ compositing Periodontal tissue regeneration

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Biomimetic Preparation of Magnetite/Chitosan Nanocomposite via In situ Composite Method ——Potential Use in Magnetic Tissue Repair Domain

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Chemical Research in Chinese Universities 2006年第6期22卷 792-796页

作者： HU Qiao-ling WU Jia CHEN Fu-ping SHEN Jia-cong Institute of Polymer Composites Zhejiang University Hangzhou 310027 P. R. China

This study focused on the preparation of magnetic chitusan nanocompesite that has a potential application to bone repair and regeneration using an in situ composite method where chitosan membrane was used as the template and NaOH was used as the precipitant. X-ray diffraction analysis results show the formation of magnetite in the chitosan matrix. From the magnetic measurement, it could be concluded that the magnetic chitosan rods were superparamagnetic,and that this is the unique property of nanomagnetite. Macroscopical layer structure of the magnetic chitosan rods was observed from the photographs after mechanical test, and the microlayer structure of the rods was observed from the images of scanning electron microscopy. The mechanism for preparing the rods was discussed in detail. Transmission electron microscope was used to investigate the magnetite particles in the chitosan matrix and from the images it was concluded that the magnetite particles dispersed well in chitosan matrix with particle size of about 10 nm. The mechanical properties of the magnetic chitosan rods were measured and the blending strength was found to be 98. 8 MPa. The mechanical properties did not decline when compared with those of the pure chitosan materials.

关键词： Chitosan Magnetite in situ compositing Red

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