Hydrogen bonding directed co-assembly of polyoxometalates and polymers to core–shell nanoparticles
发布时间:2018-09-27   浏览次数:174

Non-covalent interactions, including van der Waals forces, hydrophobic interaction, hydrogen bonding, aromatic stacking and electrostatic interaction, have been employed as driving forces to assemble the polymer–NP complex structures. This protocol is feasible from the aspect of synthesis and can build self-healing materials and smart materials that are responsive to external stimuli due to the dynamic nature of the non-covalent bonding. A thorough understanding of the non-covalent interactions is critical to the design of building blocks and tune the strength of the polymer template/NP interactions. Recently, Prof. Panchao YIN in South China Advanced Institute for Soft Matter Science and Technology at South China University of Technology, used polyoxometallate (POM) as a model to investigate the effects of non-covalent interactions in polymer/POM co-assembly systems. They reported the synthesis, structural characterization, and the formation mechanism of core–shell NPs with polymer cores and close-packed POM shells. Poly(4-vinylpyridine) (P4VP) was used as the template material to form complexes with 5 POM clusters with different topologies and charge densities, respectively. The morphologies of the obtained NP complexes were studied by electron microscopy and scattering techniques while the non-covalent interactions between the POMs and polymers were probed by vibration spectroscopy and scattering techniques.

Being similar to the formation of Pickering emulsion, water-soluble POMs can be used to stabilize P4VP in aqueous solutions to reduce the surface energy of P4VP in water, which eventually leads to the formation of thermodynamically stable solutions. A certain amount of POMs was required to fully protect the P4VP surface for high solubility and stability.

Research shows that the hydrogen bonding interaction led to the formation of core–shell nanoparticles while the charge interaction resulted in the formation of micelles and vesicles. The core of P4VP interacted with hydroxyl/water sites on the POM surface via hydrogen bonding, which drives the formation of core–shell NPs.

This result has been published as Advanced Articles in Materials Chemistry Frontiers. The corresponding authors of this article are Prof. Panchao YIN (South China University of Technology), Prof. Tianbo LIU (Department of Polymer Science, The University of Akron) and Prof. Tao LI (Argonne National Laboratory). 

Zhou, J.; Hu, J.; Li, M.; Li, H.; Wang, W.; Liu, Y.; Winans, R. E.; Li, T.; Liu, T.; Yin, P. Hydrogen bonding directed co-assembly of polyoxometalates and polymers to core–shell nanoparticles. Mater. Chem. Front. 2018, Advanced Article.

Link:http://pubs.rsc.org/en/content/articlelanding/2018/qm/c8qm00291f#!divAbstract


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