Study of intercalation compounds using ionic liquids into montmorillonite and their thermal stability

Chisato Takahashi; Takashi Shirai; Yasuhiko Hayashi; Masayoshi Fuji

doi:10.1016/j.ssi.2013.03.032

Study of intercalation compounds using ionic liquids into montmorillonite and their thermal stability

Chisato Takahashi, Takashi Shirai, Yasuhiko Hayashi, Masayoshi Fuji

School of Engineering

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

In the present study, we investigated the direct intercalation of three kinds of ionic liquids (ILs) of different salts (imidazolium and ammonium) and cation sizes into montmorillonite (M) clay, and successfully fabricated the IL intercalated montmorillonite (M_IL) compounds. The peak shifts of the M_IL intercalated compounds in comparison with dried montmorillonite powder as observed by XRD results showed that crystal swelling was significantly influenced by the cation sizes of the ILs. The intercalation behaviors of the M_IL compounds were also compared by TEM and the results are in good agreement with the XRD. The TEM–EDS results further confirmed the intercalation of three types of ILs into the montmorillonite. Based on the cation exchange capacity as measured by ICP and mathematical calculations, the extent of the intercalation and arrangement of cations in the interlayers of the montmorillonite are proposed. The TG-DTA results showed an improved thermal stability of all three kinds of M_IL intercalated compounds, and the XRD indicated that the remaining IL initiates a carbonization process with the montmorillonite at 1000 °C. Furthermore, the AC impedance results of the M_IL compounds showed an ionic conductivity. These results suggest the possible application of the M_IL intercalated compounds in electrical conductive films, solar cells, fuel cells, etc.

Original language	English
Pages (from-to)	53-61
Number of pages	9
Journal	Solid State Ionics
Volume	241
DOIs	https://doi.org/10.1016/j.ssi.2013.03.032
Publication status	Published - Jun 1 2013

Keywords

Clay
Electrical properties
Ionic liquid
Thermogravimetric analysis (TGA)
Transmission electron microscopy (TEM)
X-ray diffraction (XRD)

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/j.ssi.2013.03.032

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title = "Study of intercalation compounds using ionic liquids into montmorillonite and their thermal stability",

abstract = "In the present study, we investigated the direct intercalation of three kinds of ionic liquids (ILs) of different salts (imidazolium and ammonium) and cation sizes into montmorillonite (M) clay, and successfully fabricated the IL intercalated montmorillonite (MIL) compounds. The peak shifts of the MIL intercalated compounds in comparison with dried montmorillonite powder as observed by XRD results showed that crystal swelling was significantly influenced by the cation sizes of the ILs. The intercalation behaviors of the MIL compounds were also compared by TEM and the results are in good agreement with the XRD. The TEM–EDS results further confirmed the intercalation of three types of ILs into the montmorillonite. Based on the cation exchange capacity as measured by ICP and mathematical calculations, the extent of the intercalation and arrangement of cations in the interlayers of the montmorillonite are proposed. The TG-DTA results showed an improved thermal stability of all three kinds of MIL intercalated compounds, and the XRD indicated that the remaining IL initiates a carbonization process with the montmorillonite at 1000 °C. Furthermore, the AC impedance results of the MIL compounds showed an ionic conductivity. These results suggest the possible application of the MIL intercalated compounds in electrical conductive films, solar cells, fuel cells, etc.",

keywords = "Clay, Electrical properties, Ionic liquid, Thermogravimetric analysis (TGA), Transmission electron microscopy (TEM), X-ray diffraction (XRD)",

author = "Chisato Takahashi and Takashi Shirai and Yasuhiko Hayashi and Masayoshi Fuji",

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AU - Takahashi, Chisato

AU - Shirai, Takashi

AU - Hayashi, Yasuhiko

AU - Fuji, Masayoshi

PY - 2013/6/1

Y1 - 2013/6/1

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AB - In the present study, we investigated the direct intercalation of three kinds of ionic liquids (ILs) of different salts (imidazolium and ammonium) and cation sizes into montmorillonite (M) clay, and successfully fabricated the IL intercalated montmorillonite (MIL) compounds. The peak shifts of the MIL intercalated compounds in comparison with dried montmorillonite powder as observed by XRD results showed that crystal swelling was significantly influenced by the cation sizes of the ILs. The intercalation behaviors of the MIL compounds were also compared by TEM and the results are in good agreement with the XRD. The TEM–EDS results further confirmed the intercalation of three types of ILs into the montmorillonite. Based on the cation exchange capacity as measured by ICP and mathematical calculations, the extent of the intercalation and arrangement of cations in the interlayers of the montmorillonite are proposed. The TG-DTA results showed an improved thermal stability of all three kinds of MIL intercalated compounds, and the XRD indicated that the remaining IL initiates a carbonization process with the montmorillonite at 1000 °C. Furthermore, the AC impedance results of the MIL compounds showed an ionic conductivity. These results suggest the possible application of the MIL intercalated compounds in electrical conductive films, solar cells, fuel cells, etc.

KW - Clay

KW - Electrical properties

KW - Ionic liquid

KW - Thermogravimetric analysis (TGA)

KW - Transmission electron microscopy (TEM)

KW - X-ray diffraction (XRD)

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Study of intercalation compounds using ionic liquids into montmorillonite and their thermal stability

Abstract

Keywords

ASJC Scopus subject areas

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