Journal
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
Volume 40, Issue 6, Pages 811-818Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2018.1484293
Keywords
Exfoliation; LDH; intercalation; nanosheet; zwitterionic surfactant
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Funding
- Startup fund for doctoral scholars of Taiyuan University of Science and Technology [20142042]
- Coal-based key Science and Technology Development Program of Shanxi [MJH2014-12]
- National Natural Science Foundation of China [21673132]
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A new strategy to exfoliate inorganic layered double hydroxide (LDH) solids to micrometer-sized and positively-charged nanosheets in aqueous solution is presented. The procedure involves intercalation of zwitterionic surfactant into the decarbonated LDH by ion exchange, followed by simply stirring the surfactant-intercalated LDH in an aqueous solution of pH = 2. Since the charge of zwitterionic surfactant can be varied from anionic to cationic by adjusting the pH, the zwitterionic ions present in the interlayer were converted to cationic at pH = 2, resulting in the exfoliation of LDH by electrostatic repulsion. The delaminated LDHs nanosheets were confirmed by XRD, TEM, and AFM analyses. This simple method did not need reflux at high temperature, overcame the drawback of using organic solvents, and even resulted in a stably colloidal dispersion of nanosheets. [GRAPHICS] .
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