AgSt/AgBr复合物的制备及其热行为研究

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

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.

AgSt/AgBr compesite 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 compesite was respectively measured by FFIR, 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.