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Nanomaterials 2015, 5(3), 1454-1468; doi:10.3390/nano5031454

Synthesis of Water-Based Dispersions of Polymer/TiO2 Hybrid Nanospheres

Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, 8093 Zurich, Switzerland
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Academic Editor: Thomas Nann
Received: 3 August 2015 / Revised: 18 August 2015 / Accepted: 24 August 2015 / Published: 28 August 2015
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Abstract

We develop a strategy for preparing water-based dispersions of polymer/TiO2 nanospheres that can be used to form composite materials applicable in various fields. The formed hybrid nanospheres are monodisperse and possess a hierarchical structure. It starts with the primary TiO2 nanoparticles of about 5 nm, which first assemble to nanoclusters of about 30 nm and then are integrated into monomer droplets. After emulsion polymerization, one obtains the water-based dispersions of polymer/TiO2 nanospheres. To achieve universal size, it is necessary to have treatments with intense turbulent shear generated in a microchannel device at different stages. In addition, a procedure combining synergistic actions of steric and anionic surfactants has been designed to warrant the colloidal stability of the process. Since the formed polymer/TiO2 nanospheres are stable aqueous dispersions, they can be easily mixed with TiO2-free polymeric nanoparticle dispersions to form new dispersions, where TiO2-containing nanospheres are homogeneously distributed in the dispersions at the nanoscale, thus leading to various applications. As an example, the proposed strategy has been applied to generate polystyrene/TiO2 nanospheres of about 100 nm in diameter. View Full-Text
Keywords: hybrid; TiO2; nanocomposite; mini-emulsion; microchannel; intense turbulent shear hybrid; TiO2; nanocomposite; mini-emulsion; microchannel; intense turbulent shear
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jin, L.; Wu, H.; Morbidelli, M. Synthesis of Water-Based Dispersions of Polymer/TiO2 Hybrid Nanospheres. Nanomaterials 2015, 5, 1454-1468.

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