期刊
LANGMUIR
卷 29, 期 40, 页码 12358-12366出版社
AMER CHEMICAL SOC
DOI: 10.1021/la402836d
关键词
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资金
- National Basic Research Program of China [2012CB025901]
- National Science Foundation of China [51073145, 21304029]
- Specialized Research Fund for the Doctoral Program of Higher Education [20121301120004]
- Natural Science Foundation of Hebei Province [B2013201117]
- Plan of Science Technology Research and Development of Hebei Province [12211204]
- Hebei University [Y2011223]
The liquid crystalline phase behavior and sol-gel transition in halloysite nanotubes (HNTs) aqueous dispersions have been investigated by applying polarized optical microscopy (POM), macroscopic observation, rheometer, small-angle X-ray scattering, scanning electron microscopy, and transmission electron microscopy. The liquid crystalline phase starts to form at the HNT concentration of 1 wt %, and a full liquid crystalline phase forms at the HNT concentration of 25 wt % as observed by POM and macroscopic observation. Rheological measurements indicate a typical shear flow behavior for the HNT aqueous dispersions with concentrations above 20 wt % and further confirm that the sol-gel transition occurs at the HNT concentration of 37 wt %. Furthermore, the HNT aqueous dispersions exhibit pH-induced gelation with more intense birefringence when hydrochloric acid (Ha) is added. The above findings shed light on the phase behaviors of diversely topological HNTs and lay the foundation for fabrication of the long-range ordered nano-objects.
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