有机质对氢氧化镁微晶结构的影响

在有机介质中制备有机质复合氢氧化镁,并对产品进行水热处理.通过XRD、SEM和TG-DTA的分析表明,非水热处理得到的复合氢氧化镁晶体粒径及晶面间距较小,晶格畸变率大,其分解温度比纯氢氧化镁降低14～68 ℃.经水热处理后,有机质复合氢氧化镁晶体变规整,晶粒增大、畸变率减小,聚集体大小均匀、分散性改善,其分解温度相应提高5～20 ℃,晶体平均粒径增加31.3～69.1 nm.     

IGC反气相色谱法分析氧化铝包覆碳酸钙二元复合物表面能的研究

Spindly calcium carbonate coated with AlOOH has been successfully prepared by bubbling carbonization method. SEM and XRD analysis results suggested an amorphous filiform the coating layer of AlOOH. Inverse gas chromatography (IGC) analysis indicated that γ_s^D, the London component of surface energy of calcium carbonate increased after being coated with AlOOH, especially when with the coating weight quantity of 4%. And the reduction of the γ_s^D value with the ascending column temperature became more obvious along with the increase of the coating weight quantity, which might be due to the desorption of water from the surface. In addition, the surface acid- alkali capacity of calcium carbonate also increased after coating.