Journal
CRYSTALS
Volume 12, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/cryst12091253
Keywords
coconut fatty acid; montmorillonite; nanocomposite; intercalation; X-ray diffraction
Funding
- Ministry of Trade, Industry, and Energy, Republic of Korea [20011253]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20011253] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, CDEA was successfully intercalated into montmorillonite using both solution and solid-state reaction methods. The acid-base intralayer complexation was found to be responsible for the solid-state intercalation reaction.
Coconut fatty acid diethanolamine (cocamide-DEA (CDEA)), CH3(CH2)(16)CON(CH2CH2OH)(2) was intercalated into montmorillonite using both solution and solid-state reaction methods. In a typical solution process, the CDEA aqueous solution was mixed with a montmorillonite (Kunipia-F) aqueous suspension, which resulted in a CDEA-montmorillonite layer complex with a basal spacing of 13.8 angstrom. A CDEA-montmorillonite complex was also easily prepared by the solid-solid reaction method. A mixture of CDEA and Na-montmorillonite was ground at ambient temperature. The basal spacing of the mixture increased to approximately 44 angstrom after grinding for 30 min. Upon washing, the basal spacing decreased to approximately 10 angstrom, which was close to that of pristine Na-montmorillonite owing to the deintercalation of the CDEA molecules. The basal spacing of the CDEA-montmorillonite composite starting from protonated montmorillonite decreased to 13.5 angstrom upon washing, indicating the parallel monolayer arrangement of CDEA molecules between the silicate layers. This finding strongly suggests that acid-base intralayer complexation is responsible for the solid-state intercalation reaction.
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