Das R N, Pramanik P
Department of Chemistry, IIT Kharagpur, West-Bengal, Kharagpur-721302, India.
J Nanosci Nanotechnol. 2004 Jan-Feb;4(1-2):94-7. doi: 10.1166/jnn.2004.040.
Nanocrystalline alpha-Al2O3 ceramic powders have been prepared from aqueous poly vinyl alcohol (PVA)-aluminum nitrate solution and jute (plant fiber). Soluble Al-ion-PVA solution formed a uniform coating on the surface of jute once it dried completely. Slow hydrolysis of aluminum ion with ammonium hydroxide deposited aluminum hydroxide on the jute surface. Decomposition of the dried aluminum hydroxide-coated jute at high temperature (1150 degrees C/2 hrs) resulted in the formation of single-phase, nanocrystalline alpha-Al2O3 with the corresponding average X-ray and TEM particle size approximately 50 nm. Precursor and heat-treated powders have been characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analysis. This method can be used to produce high-temperature as well as low-temperature nanocrystalline oxides.
纳米晶α-Al2O3陶瓷粉末是由聚乙烯醇（PVA）-硝酸铝水溶液和黄麻（植物纤维）制备而成的。可溶性铝离子-PVA溶液完全干燥后会在黄麻表面形成一层均匀的涂层。铝离子与氢氧化铵的缓慢水解在黄麻表面沉积了氢氧化铝。在高温（1150℃/2小时）下干燥的氢氧化铝涂层黄麻分解后，形成了单相纳米晶α-Al2O3，其相应的平均X射线和透射电子显微镜（TEM）粒径约为50纳米。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析对前驱体粉末和热处理后的粉末进行了表征。该方法可用于制备高温以及低温纳米晶氧化物。
