期刊
ACS NANO
卷 5, 期 5, 页码 3930-3936出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn200413d
关键词
microcapsules; protrusion; nanotubes; Schiff base; hydrolysis
类别
资金
- Max-Planck Society
- Zhejiang Provincial Natural Science Foundation of China [Z4090177]
- Ministry of Science and Technology of China for the Indo-China Cooperation [2010DFA51510]
- Natural Science Foundation of China [50873087]
Protrusion of one-dimensional nanotubes or nanorods from the poly(allylamine hydrochloride)-graft-pyrene (PAH-Py) microcapsules was discovered when the microcapsules were Incubated in pH 0 and pH 2 solutions, respectively. Micelles assembled from deliberately synthesized PAH-Py polymers were also able to transform into one-dimensional structures, demonstrating the chemistry driven nature of the phenomenon. The one-dimensional nanotubes consisted of only 1-pyrenecarboxaldehyde with ordered pi-pi stacking, and showed a helical structure and anisotropic property. The hydrolysis of Schiff base and its rate at different pH values (10 times slower at pH 0 than at pH 2) played a key role in determining the final nanostructures, and the linear PAH directed the regular building up process especially for the nanotubes. Hollow capsules budded with nanotubes or nanorods mimicking the cellular protrusion of filopodia were successfully prepared by tuning the incubation pH and time. These results and the proposed mechanism open new opportunities for design of novel micronanostructures and materials for nanoscience, and biological and their advanced technologies.
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