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Facile Synthesis of Starch-Based Nanoparticles Stabilized Pickering Emulsion: Its pH-Responsive Behavior and Application for the Recyclable Catalysis

Abstract

In this work, a pH-responsive [2-(dimethylamine)ethyl methacrylate] (DMAEMA) grafted maize starch composite was synthesized via free radical polymerization in the presence of crosslinker N,N'-Methylenebisacrylamide (BIS). Combined with the gelatinization-alcohol precipitation process, this starch-based composite in an optimizing component ratio showed a nanometer size and regular sphere, along with a high freedom of the molecular chain, which was not only a breakthrough in the structures, but also brought about an outstanding performance in pH-responsiveness. Its superiority was proved by the formation of Pickering emulsion that underwent pH-induced reversible emulsification/demulsification at least 8 cycles without obvious performance decay or even morphology changes. Dynamic light scattering, zeta potential measurement and interfacial tension measurement, as well as contact angle measurement, confirmed synergistically that the reversible emulsification/demulsification cycle was the result of the tunable wettability and size of these novel starch-based nanoparticles under pH variation. More importantly, benefited from DMAEMA as the stabilizers and growth points for Au nanoparticles and the large interfacial area of the emulsion droplets together with the pH-responsive reversible emulsification/demulsification cycle, the generated Pickering emulsion could be readily applied as the catalytic microreactors for the hydrogenation of p-nitroanisole by p-nitroanisole at the oil–water interface. This catalysis exhibited both highly catalytic activity and good recyclability. The excellent performance makes us believe that this system is promising for meeting the requirements of green and sustainable chemistry.

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Supplementary files

Publication details

The article was received on 15 Jan 2018, accepted on 14 Feb 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C8GC00143J
Citation: Green Chem., 2018, Accepted Manuscript
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    Facile Synthesis of Starch-Based Nanoparticles Stabilized Pickering Emulsion: Its pH-Responsive Behavior and Application for the Recyclable Catalysis

    L. Qi, Z. Luo and X. Lu, Green Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8GC00143J

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