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首页> 外文期刊>RSC Advances >Crystallization and temperature-dependent structure deflection of C(6)mimBr ionic liquid intercalated in LAPONITE (R)
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Crystallization and temperature-dependent structure deflection of C(6)mimBr ionic liquid intercalated in LAPONITE (R)

机译：Laponite（R）中插入的C（6）MIMBR离子液体的结晶和温度依赖性结构挠度

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摘要

The physicochemical properties of large molecules confined in nanopores are expected to be different from those of the bulk. This study investigates the cation-anion relative position and the molecular orientation of the 1-hexyl-3-methylimidazolium bromide (C(6)mimBr) ionic liquid intercalated in LAPONITE (R) by a temperature-dependent X-ray absorption fine structure (XAFS) and some traditional methods (TEM, DSC, XRD, and IR). DSC and TEM analyses revealed the formation of C(6)mimBr crystals intercalated in LAPONITE (R). The XAFS and XRD analyses at ambient temperature revealed that an ordered monolayer structure, with C(6)mim(+) cations intercalated in the interlayer nanospace and Br located on the edge of the LAPONITE (R), was formed when ILs were intercalated in LAPONITE (R). The results also demonstrated that the enhanced interactions, the formed hydrogen bonds, as well as the ordered monolayer arrangement induced the formation of C(6)mimBr crystals when intercalated in LAPONITE (R). In situ XAFS analysis with a combination of XRD patterns at varied temperatures revealed that the structure orientation of the intercalated C(6)mim(+) cations tends to deflect and maintain the ordered monolayer arrangement with the elevation of temperature. The ordered crystal structure still exists at 120 degrees C and disappears at a higher temperature.
机译：限制在纳米孔中的大分子的物理化学性质预计将与块状物质不同。本研究研究了通过温度依赖性的X射线吸收细结构（以下）将邻己基-3-甲基咪唑溴化物（C（6）MIMBR）离子液体（C（6）MIMBR）离子液体中嵌入的阳离子 - 阴离子相对位置和分子取向（ XAFS）和一些传统方法（TEM，DSC，XRD和IR）。 DSC和TEM分析显示C（6）嵌入丙岩（R）中嵌入的C（6）MIMBR晶体的形成。在环境温度下，XAFS和XRD分析显示，当ILS插入时，形成有序的单层结构，其中具有C（6）MIM（+）彼此在层间纳米周期和位于Laponite（R）的边缘上的Br中的晶片Laponite（r）。结果还证明增强的相互作用，形成的氢键，以及当在丙伯岩（R）中嵌入时诱导形成C（6）MIMBR晶体的形成。在变化温度下的XRD图案组合的原位XAFS分析显示，插入的C（6）MIM（+）阳离子的结构取向趋于偏转并将有序的单层布置与温度的升高保持并保持。有序的晶体结构仍然在120摄氏度下存在，并且在较高温度下消失。

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  • 来源
    《RSC Advances》 |2016年第100期|共8页
  • 作者

    Jiang Fangling; Li Cheng; Guo Xiaojing; Fu Haiying; Wu Guozhong; Chen Shimou;

  • 作者单位

    Chinese Acad Sci Shanghai Inst Appl Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys Shanghai 201800 Peoples R China;

    Chinese Acad Sci Inst Proc Engn Beijing 100190 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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