纳米Fe_3O_4制备及不同分散剂锦纶织物化学复合镀银

Preparation of Fe_3O_4 Nanoparticles and Electroless Composite Plating of Ag-Fe_3O_4 on Polyamide Fabric with Different Dispersants

使用不同种类的分散剂分散磁性纳米Fe3O4微粒,并将其添加到化学镀银液中,实现了锦纶织物纳米Fe3O4微粒复合镀银。借助扫描电镜、X射线衍射和热重等分析技术对镀层表面形貌、成分、结构和织物热性能进行了研究,并测定了织物的电磁波屏蔽效能、表面比电阻和耐磨性能。结果表明:较普通镀银织物,不同分散剂分散纳米Fe3O4微粒镀银层表面形貌有所不同;三聚磷酸钠分散纳米Fe3O4微粒复合镀层结构没有改变,晶粒尺寸有所减小,热起始分解温度有所升高,耐磨性稍有所增强;当增重率相同,纳米Fe3O4微粒的质量浓度低时,电磁波屏蔽效能稍有所增强;随着增重率的增加,平均屏蔽效能逐渐增大,表面比电阻逐渐减小。

Fe3O4 nanoparticles were first prepared by co-precipitation technique,and then was dispersed using different surfactants,subsequently added to the silver plating solution,in which the composite deposition of Ag-Fe3O4 on polyamide fabric was fabricated.The structures of the Ag-Fe3O4 coating fabrics were characterized by scanning electron microscopy,energy dispersive spectroscopy,X-ray diffraction,and thermogrametric analysis respectively.The electromagnetic shielding performance,surface specific resistance and abrasion resistance were also determined.The results show that as compared with common Ag-coated fabric,the surfaces of the Ag-Fe3O4-coated fabrics are covered by a layer of flocculus.The crystal structure of Ag coating using sodium triphosphate as surfactant does not change but the grain size decreases.The onset decomposition temperature increases slightly and the abrasion resistance of Ag-Fe3O4-coated fabric is enhanced.When the weight increasing rates are identical,the shielding effectiveness of the Ag-Fe3O4-coated fabric is higher than that of the Ag-coated one provided that the add-ons of Fe3O4 nanoparticles are not much.The average shielding effectiveness gradually increases with the increasing of the weight increasing rate,while the surface specific resistance decreases.