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Formation of a kaolinite-serine intercalation compound via exchange of the pre-intercalated transition molecules in kaolinite with serine
AbstractA kaolinite-serine intercalation compound was synthesized via the guest displacement method. Serine molecules were intercalated into kaolinite to form kaolinite-serine through exchange between serine and the guest molecules ethylene glycol or water, which was inserted into the interlayer space of kaolinite beforehand. The thickness of kaolinite-serine particles decreased to 14nm from 30nm of raw kaolinite after intercalation. The interlayer distance of kaolinite reached approximately 1.13nm after the intercalation of serine molecules. The serine molecules inserted in the interlayer space of kaolinite molecules were arranged in a flattened monolayer configuration and partially compressed into the tetragonal holes in the silicate layer. The activation energy Ea for releasing the pre-intercalated molecule before ultimate exchanging with serine determines the intercalation degree of serine into kaolinite. Higher Ea makes the expansion of kaolinite with pre-intercalated molecules more stable, which will facilitate the final intercalation of serine. The activation energy is 6.95kJ/mol for ethylene glycol and 21.2kJ/mol for water, respectively, resulting in serine intercalation degree of 45%, and 85% correspondingly. The kaolinite-serine intercalation compound is expected to be applied in the pharmaceutical and cosmetics fields.
Graphical abstractA kaolinite-serine intercalation compound was formed via the guest displacement method. The results show that serine can be intercalated into kaolinite to form kaolinite-serine by exchanging it with the guest molecules of ethylene glycol or water in the interlayer instead of inserting it directly into kaolinite. The activation energy Ea for releasing the pre-intercalated molecule before intercalation controlled the degree of serine insertion into kaolinite based on N=0.9−Aexp(−Ea/RT). This value was 6.95kJ/mol for ethylene glycol and 21.2kJ/mol for water as transition molecules. The intercalation degree of the former was 45%, and that of the latter was 85%, which was ~1.8 times the value of the former. The kaolinite-serine intercalation compound is expected to be applied in the pharmaceutical and cosmetics fields.
Formation of a kaolinite-serine intercalation compound via exchange of the pre-intercalated transition molecules in kaolinite with serine
AbstractA kaolinite-serine intercalation compound was synthesized via the guest displacement method. Serine molecules were intercalated into kaolinite to form kaolinite-serine through exchange between serine and the guest molecules ethylene glycol or water, which was inserted into the interlayer space of kaolinite beforehand. The thickness of kaolinite-serine particles decreased to 14nm from 30nm of raw kaolinite after intercalation. The interlayer distance of kaolinite reached approximately 1.13nm after the intercalation of serine molecules. The serine molecules inserted in the interlayer space of kaolinite molecules were arranged in a flattened monolayer configuration and partially compressed into the tetragonal holes in the silicate layer. The activation energy Ea for releasing the pre-intercalated molecule before ultimate exchanging with serine determines the intercalation degree of serine into kaolinite. Higher Ea makes the expansion of kaolinite with pre-intercalated molecules more stable, which will facilitate the final intercalation of serine. The activation energy is 6.95kJ/mol for ethylene glycol and 21.2kJ/mol for water, respectively, resulting in serine intercalation degree of 45%, and 85% correspondingly. The kaolinite-serine intercalation compound is expected to be applied in the pharmaceutical and cosmetics fields.
Graphical abstractA kaolinite-serine intercalation compound was formed via the guest displacement method. The results show that serine can be intercalated into kaolinite to form kaolinite-serine by exchanging it with the guest molecules of ethylene glycol or water in the interlayer instead of inserting it directly into kaolinite. The activation energy Ea for releasing the pre-intercalated molecule before intercalation controlled the degree of serine insertion into kaolinite based on N=0.9−Aexp(−Ea/RT). This value was 6.95kJ/mol for ethylene glycol and 21.2kJ/mol for water as transition molecules. The intercalation degree of the former was 45%, and that of the latter was 85%, which was ~1.8 times the value of the former. The kaolinite-serine intercalation compound is expected to be applied in the pharmaceutical and cosmetics fields.
Formation of a kaolinite-serine intercalation compound via exchange of the pre-intercalated transition molecules in kaolinite with serine
Wang, Zongrong (author) / Zheng, Wan (author) / Zhang, Zhenqian (author) / Chen, Likun (author) / Zhang, Zhongfei (author) / Li, Yong (author) / Ma, Ning (author) / Du, Piyi (author)
Applied Clay Science ; 135 ; 378-385
2016-10-12
8 pages
Article (Journal)
Electronic Resource
English
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