In order to supply high quality silver source to photothermographic material based on silver carboxylate, silver plamitate was prepared by chemical deposition method using palmitic acid, sodium hydroxide, silver nitrate as raw materials and PVP as surfactant in water system. The morphology, crystal structure and thermal properties of silver palmitate were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and Thermogravimetry (TG). The results indicate that silver palmitate has good purity and well-defined layer structure with triclinic phase. The diameter of fiber-like silver palmitate is about 200 nm, which shows excellent dispersion properties. DSC curves demonstrate that silver palmitate has seven endothermic peaks below 240°C. Five endothermic peaks below 190°C assign to different phase transitions. Silver palmitate decomposed step-by-step at 204.1, 223.6, and 253.9°C.

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棕榈酸银的制备和表征

为了给基于羧酸银的光热敏材料提供高质量的银源，以棕榈酸、氢氧化钠、硝酸银为原料，PVP为表面活性剂，在水体系中采用化学沉积法制备了棕榈酸银。采用扫描电子显微镜（SEM）、X射线粉末衍射（XRD）、傅里叶变换红外光谱（FTIR）、差示扫描量热法（DSC）和热重分析法（TG）对棕榈酸银的形貌、晶体结构和热性能进行了表征. 结果表明，棕榈酸银纯度高，层状结构清晰，具有三斜晶相。纤维状棕榈酸银的直径约为200 nm，具有优异的分散性能。DSC 曲线表明棕榈酸银在 240°C 以下有七个吸热峰。低于 190°C 的五个吸热峰归属于不同的相变。棕榈酸银在 204.1、223.6 和 253.9°C 时逐步分解。