Synthesis of Water-Based Dispersions of Polymer-TiO2 Hybrid NanospheresReportar como inadecuado


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


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Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, 8093 Zurich, Switzerland





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Academic Editor: Thomas Nann

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





Autor: Lu Jin, Hua Wu * and Massimo Morbidelli *

Fuente: http://mdpi.com/



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