插层-磨剥法制备不同径厚比的高岭石

Intercalation and delamination grinding applied to prepare kaolinite of different aspect ratio

通过对醋酸钾/高岭石插层复合物的机械磨剥制备了不同径厚比的高岭石样品,并利用X射线粉晶衍射(XRD)、激光粒度仪、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和傅里叶变换红外光谱(FTIR)表征了4个样品的粒径、结构以及形貌。实验结果表明:随着插层磨剥次数的增加,高岭石的结晶度指数(HI)由原矿的1.29降至0.69,结晶度降低,晶体结构在一定程度上遭到破坏。同时,4个样品的粒径及厚度逐渐减少,径厚比依次增大至11.7。此外,经过3次插层磨剥洗涤后,部分剥离的片层发生卷曲,但很少完全卷曲成纳米卷。

Kaolinite samples of different aspect ratio were prepared through mechanical delamination grinding of potassium acetate/kaolinite intercalation compound, and the particle size, structure and morphology of four kaolinite samples were characterized by X-ray diffraction(XRD), laser particle size analysis, scanning electron microscopy(SEM), transmission electron microscopy(TEM) and Fourier transform infrared spectroscopy(FTIR). Experimental results show that with increasing times of intercalation and delamination, the crystallinity index(HI) of kaolinite decreases from 1.29 to 0.69, the degree of crystallinity also decreases and its crystal structure is destroyed to some extent. At the same time, particle size and the thickness of four kaolinite samples gradually decreased, and aspect ratio increases to 11.7 gradually. In addition, some stripped layers displayed curling(although rarely completely curled into nanoscrolls) after three times of intercalation and delamination.