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0 IntroductionIn recentyears, the nanosized m etallic m aterialshave attracted m ore and m ore attention because oftheirvirtue ofunusualoptical, electronic, m agnetic,and chem icalproperties[1 ̄5].They are expected to havem any potential applications in d… 相似文献
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Composite microspheres composed of monodispersed poly(St-co-MAA) latices with diameter about 260 nm as core and Ag nanocrystals as shell were prepared by an in situ reduction method. The shell thickness could be controlled in the range of 15--45 nm by this coating process. The structure and the composition of the core-shell microspheres were characterized by transmission electron microscopy (TEM), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TG). The formation of the composite microspheres is explained by the nucleation of silver on the surface of the latices followed by growth of the silver shell. 相似文献
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相转移方法制备水溶性Fe3O4纳米晶 总被引:1,自引:0,他引:1
在有机溶剂中合成了超顺磁性的油溶性Fe3O4纳米晶. 利用相转移的方法成功地将油溶性Fe3O4纳米晶完全转移至水相中, 其中两性齐聚物——聚马来酸脂肪胺酯作为修饰剂包裹在Fe3O4纳米晶的表面. 利用透射电子显微镜(TEM)、红外光谱仪、热失重分析和动态光散射仪对水溶性纳米晶的形貌和结构进行了表征. 所制备的水溶性磁流体在外加磁场的环境中表现出所预期的超顺磁性行为. 两性齐聚物中疏水链的长度能够显著地影响相转移效果, 研究发现利用含有十六个碳链的聚马来酸十六胺酯来转移纳米晶时效果最好. 生物相容性测试实验表明两性齐聚物修饰的Fe3O4纳米晶在各种生理环境中都能够稳定地存在, 并没有发生团聚现象. 相似文献
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