Abstract The Halloysite/stearic acid (SA) intercalation complex was successfully prepared basing on dimethylsulfoxide (DMSO) intercalated halloysite complex as intermediates. The prepared intercalation samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermal analysis (thermogravimetry (TGA) and differential scanning calorimetry (DSC)) and transmission electron microscopy (TEM). The XRD data presented that basal interlayer spacing was enlarged to 3.99 nm as the intercalation of SA molecules, meanwhile, the presence of two strong bands observed at 2918 cm−1 and 2849 cm−1 in FT-IR spectrum also indicated SA intercalated into interlayer of Hal. The stearic acid molecules may arranged in a combination form of trilayer parallel arrangement and monolayer aslant at angle of 56.74° to 64.51°. The SA molecules were linked to Al-O-CH3 by hydrogen bond and the hydroxonium ions was absorbed on the SiO4 tetrahedral sheets. The prepared Hal-SA intercalate was stable below 150 °C, and the activation energy E of de-intercalation is 86.81 kJ/mol, which increased by 4.64 kJ/mol compared with that of Hal-DMSO complex. The approximate structure model of the new intercalate was proposed on the basis of XRD, IR and NMR data.

中文翻译：

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埃洛石-硬脂酸插层化合物的制备及插层结构模型

摘要 以二甲基亚砜（DMSO）插层埃洛石络合物为中间体，成功制备了埃洛石/硬脂酸（SA）插层络合物。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、热分析（热重（TGA）和差示扫描量热法（DSC））和透射电子显微镜（TEM）对制备的插层样品进行表征。XRD 数据表明，随着 SA 分子的嵌入，基底层间距扩大到 3.99 nm，同时，在 FT-IR 光谱中在 2918 cm-1 和 2849 cm-1 处观察到的两个强谱带的存在也表明 SA 嵌入了层间哈尔。硬脂酸分子可以呈三层平行排列和单层倾斜56.74°～64.51°的组合形式。SA 分子通过氢键与 Al-O-CH3 连接，并且氢氧根离子被吸附在 SiO4 四面体片上。制备的Hal-SA嵌入物在150℃以下稳定，脱嵌活化能E为86.81 kJ/mol，比Hal-DMSO配合物提高4.64 kJ/mol。根据XRD、IR和NMR数据，提出了新型插层的近似结构模型。