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Tube-graft-Sheet Nano-Objects Created by A Stepwise Self-Assembly of Polymer-Polyoxometalate Hybrids.
- Source :
-
Langmuir . Jan2016, Vol. 32 Issue 2, p460-467. 8p. - Publication Year :
- 2016
-
Abstract
- In this work, we report the preparation of complex nano-objects by means of a stepwise self-assembly of two polymer-polyoxometalate hybrids (PPHs) in solution. The PPHs are designed and synthesized by tethering two linear poly(e-caprolactone)s (PCL) of different molecular weights (MW) on a complex of a Wells-Dawson-type polyoxometalate (POM) cluster and its countraions. The higher MW PCL-POM self-assembled into nanosheets, while the lower MW PCL-POM assembled into nanotubes just by altering the ratio of water in the DMF-water mixed solvent system. The two nano-objects have a similar membrane structure in which a PCL layer is sandwiched by the two POM-based complex layers. The PCL layer in the nanosheets is semicrystalline, while the PCL layer in the nanotubes is amorphous. We further exploited this MW-dependence to self-assemble the nanotubes on the nanosheet edges to create complex tube-graft-sheet nano-objects. We found that the nanotubes nucleate on the four {110} faces of the PCL crystal and then further grow along the crystallographic b-axis of the PCL crystal. Our findings offer hope for the further development of nano-objects with increasing complexity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07437463
- Volume :
- 32
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Langmuir
- Publication Type :
- Academic Journal
- Accession number :
- 113268876
- Full Text :
- https://doi.org/10.1021/acs.langmuir.5b04504