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Effect of solvents on the direct intercalation of decylamine into H-octosilicate
Abstract Decylamine molecules were directly intercalated as guest molecules into a layered silicate, octosilicate, with hydrogen ions in the interlayers (H-octosilicate) as a host material by using a wet process with various solvents of different polarities and decylamine solubilities. The solvent containing H-octosilicate and n-decylamine was vigorously stirred at room temperature for 30 min, and the structure of the decylamine-intercalated octosilicate compounds (i.e., organo-octosilicate) was determined via X-ray diffraction (XRD) analysis. The structures of the compounds greatly varied depending on the solvent. The use of a solvent with a relatively high polarity promoted the intercalation of decylamine molecules. In particular, when water, which is a poor solvent for decylamine, was used, the decylamine molecules were well ordered in the interlayer space of H-octosilicate. The interlayer distance corresponded to double the length of the decylamine molecule, suggesting the formation of a decylamine bilayer in the interlayer space. However, the structure became irregular at high temperatures, even in water. In contrast, the use of good solvents for decylamine, such as ethanol and acetone, provided intercalated compounds with disordered structures, suggesting that it was difficult for the decylamine molecules to enter the interlayers. In particular, when nonpolar solvents such as cyclohexane and toluene were used, the intercalation of decylamine hardly occurred. Furthermore, when the intercalation treatment was conducted in aqueous ethanol solutions, the structure depended strongly on the ethanol concentration, and the basal spacing was maximized at an ethanol concentration of 50 vol%. The results of this study suggest that the solvation of decylamine molecules can determine the structure of intercalated octosilicate compounds.
Highlights The solvent effects on the structure of decylamine-intercalated H-octosilicate were studied. The intercalation treatment in water resulted in a well-ordered structure. The formation of a decylamine bilayer in the interlayer space was indicated. The solubility of decylamine greatly affected the structures of the intercalated compounds.
Effect of solvents on the direct intercalation of decylamine into H-octosilicate
Abstract Decylamine molecules were directly intercalated as guest molecules into a layered silicate, octosilicate, with hydrogen ions in the interlayers (H-octosilicate) as a host material by using a wet process with various solvents of different polarities and decylamine solubilities. The solvent containing H-octosilicate and n-decylamine was vigorously stirred at room temperature for 30 min, and the structure of the decylamine-intercalated octosilicate compounds (i.e., organo-octosilicate) was determined via X-ray diffraction (XRD) analysis. The structures of the compounds greatly varied depending on the solvent. The use of a solvent with a relatively high polarity promoted the intercalation of decylamine molecules. In particular, when water, which is a poor solvent for decylamine, was used, the decylamine molecules were well ordered in the interlayer space of H-octosilicate. The interlayer distance corresponded to double the length of the decylamine molecule, suggesting the formation of a decylamine bilayer in the interlayer space. However, the structure became irregular at high temperatures, even in water. In contrast, the use of good solvents for decylamine, such as ethanol and acetone, provided intercalated compounds with disordered structures, suggesting that it was difficult for the decylamine molecules to enter the interlayers. In particular, when nonpolar solvents such as cyclohexane and toluene were used, the intercalation of decylamine hardly occurred. Furthermore, when the intercalation treatment was conducted in aqueous ethanol solutions, the structure depended strongly on the ethanol concentration, and the basal spacing was maximized at an ethanol concentration of 50 vol%. The results of this study suggest that the solvation of decylamine molecules can determine the structure of intercalated octosilicate compounds.
Highlights The solvent effects on the structure of decylamine-intercalated H-octosilicate were studied. The intercalation treatment in water resulted in a well-ordered structure. The formation of a decylamine bilayer in the interlayer space was indicated. The solubility of decylamine greatly affected the structures of the intercalated compounds.
Effect of solvents on the direct intercalation of decylamine into H-octosilicate
Iwasaki, Tomohiro (author)
Applied Clay Science ; 199
2020-10-09
Article (Journal)
Electronic Resource
English
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