First isolation of individual silicate platelets from clay exfoliation and their unique self-assembly into fibrous arrays |
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Authors: | Lin Jiang-Jen Chu Chien-Chia Chiang Ming-Li Tsai Wei-Cheng |
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Institution: | Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan. jianglin@ntu.edu.tw |
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Abstract: | Thin silicate platelets in a dimension of approximately 80 x 80 x 1 nm(3) are isolated for the first time by a newly developed process involving one-step exfoliation of natural montmorillonite clay and toluene/aqueous NaOH extraction. The platelets are observed to be polygon shape by transmission electron microscopy (TEM) and round bent-leaf shape by dynamic force microscopy (DFM). Individual platelets possessing high-aspect-ratio dimension and ionic character are able to self-assemble into microscale fiber bundles after water evaporation. The self-stacking mechanism indicated strong face-to-face ionic charge stacking propensity in triggering a vertical growth. Regularity of fibrous bundles in an average 5 microm length has been observed. |
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