AgSt/AgBr复合物的制备及其热行为研究

分别以溴化钠(NaBr)为溴源、硬脂酸银(AgSt)为底物,用原位法合成了复合物AgSt/AgBr.利用红外光谱(FTIR)、扫描电子显微镜(SEM)、X射线衍射(XRD)与热重-差示扫描量热(TG-DSC)技术对复合物的结构、尺寸、形貌、晶型以及热行为进行了表征.结果表明,1)复合物由底物AgSt与尺寸为30—50nm的外延立方体AgBr粒子构成;2)AgSt/AgBr复合物在较低的温度下出现两个新的吸热相变峰,分别对应于97.8℃和108.8℃;3)AgSt/AgBr复合物的起始分解温度较AgSt也有所降低.

Study on the Synthesis and Thermal Behavior of AgSt/AgBr Composite

AgSt/AgBr composite was synthesized by in situ method,which NaBr and silver stearate(AgSt) was respectively used as bromide source and substrate.The structure,size,morphology and crystal form of AgSt/AgBr composite was respectively measured by FTIR,SEM,XRD,as well as the thermal behavior investigated by TG-DSC.The results showed:(1) that AgSt/AgBr composite was composed of substrate AgSt and epitaxial cubic AgBr particles with sizes ranging from 30 to 50 nm;(2) that two new phase transition peaks appeared at 97.8 ℃ and 108.8 ℃ respectively for AgSt/AgBr composite;(3) the start decomposition temperature of AgSt/AgBr composite decreased a little than that of AgSt.