Development of Biomimetic Needle-like Apatite Nanocrystals by a Simple New Method
来源期刊：复合材料学报2017年第8期
论文作者：陈宇 郑玉婴
文章页码：1653 - 1659
关键词：功能化石墨烯纳米带;分散纳米石墨;EGNRs75%-CNPs/EVA复合材料薄膜;阻隔性能;抗静电性能;
摘 要：采用十二烷基硫酸钠改善纳米石墨（CNPs）在水溶液中的分散性,使其均匀负载至功能化石墨烯纳米带（EGNRs）上,制得功能化石墨烯纳米带-纳米石墨复合体(EGNRs75%-CNPs),随后利用溶液涂覆成膜工艺在涂膜机上制得EGNRs75%-CNPs/乙烯-醋酸乙烯共聚物（EVA）复合材料薄膜。采用FTIR、XRD、XPS、TEM、FESEM、氧气透过仪、高阻计对不同EGNRs75%-CNPs含量的EGNRs75%-CNPs/EVA复合材料薄膜进行了结构和性能表征。研究表明:EGNRs75%-CNPs以3D网络形式存在,能够抑制纳米带团聚,说明其与EVA基体相容性好。当EGNRs75%-CNPs质量分数为1%时,EGNRs75%-CNPs/EVA复合材料薄膜的氧气透过率降低了67.6%,阻隔性能提高明显;当质量分数为0.8%时,CNPs负载到EGNRs构建3D导电网络,协同发挥增强作用,EGNRs75%-CNPs/EVA复合材料薄膜导电性能提升了约8个数量级,表现出了优良的室温导电性能。
Jie WEI, Yubao LI, Yi ZUO, Xueling PENG and Li ZHANGResearch Center for Nano-Biomaterials, Sichuan University, Chengdu 610064, China
摘 要：<正>A new method of calcium nitrate and sodium phosphate as reactants was employed to prepare biomimetic apatite nanocrystals by a simple heating treatment in water. The structure and properties of the apatite crystals were investigated by TEM, XRD, IR, ICP and TG. It is found that the apatite nanocrystals contain OH-, CO32-, Na+ and HPO42- ions in their crystal structure. The crystal water is removed during heating from 200℃ to 400℃. CO32-and HPO42- are decomposed at 600℃ to 800℃, also there is lattice vvater lost at this temperature stage. The morphology of the apatite nanocrystals is needle-like with a length less than 80 nm. The size and crystallinity of the apatite nanocrystals increase with vvater treatment temperature and time. Compared to the apatite crystals sintered at 800℃, water treated apatite nanocrystals are poorly crystallized apatite. The results indicate that the apatite nanocrystals have similarity in composition, structure, morphology and crystallinity to that of bone apatite crystal
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