Present study provides an approach to produce the nano-crystal material of Na2O doped 12CaO·7A12Oa (C12A7-Na2O)by the sol-gel method,which was successfully applied for the antibacterial material.The nanocrystal material was investigated via X-ray diffraction (XRD),electron paramagnetic resonance(EPR),inductively coupled plasma and atomic emission spectroscopy(ICP-AES),and time of flight mass spectrometer(TOF-MS).It was found that the structure of C12A7 was not changed by doping a small quantity of Na2O.The antibacterial activities of C12A7-Na2O against Staphylococcus aureus and Escherichia coli were examined by the attachment method.The resulting particles showed an excellent antibacterial performance.The morphology change of the bacteria was observed by field emission-scanning electron microscope(FE-SEM).The antibacterial mechanism of the C12A7-Na2O material was also discussed.%本文利用溶胶一凝胶方法制备了Na2O掺杂的C12A7(12CaO·7Al2O3-Na2O)材料,通过X-射线衍射(XRD)、电子顺磁共振(EPR)、电感等离子体耦合-原子发射光谱(ICP-AES)和飞行时间质谱(TOF-MS)研究了材料结构与性能.选用金黄色葡萄球菌和大肠杆菌为受试菌种,研究了C12A7-Na2O的抗菌性能.结果表明,Na2O掺杂对C12A7的晶体结构以及材料中的氧负离子的浓度没有显著的影响,且C12A7-Na2O材料具有较高的抗菌性能.利用扫描电镜(SEM)对杀菌前后的金黄色葡萄球菌和大肠杆菌的菌体形态进行了观测,初步探讨了C12A7-Na2O的抗菌机理.
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