Particulate Coacervation of Associative Polymer Brushes-Grafted Nanoparticles To Produce Structurally Stable Pickering Emulsions

This study introduces a new type of associative nanoparticle (ANP) that provides controlled chain-to-chain attraction with an associative polymer rheology modifier (APRM) to produce highly stable Pickering emulsions. The ANPs were synthesized by grafting hydrophobically modified hygroscopic zwitteri...

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Published in:Langmuir 2016-12, Vol.32 (50), p.13403-13408
Main Authors: Yang, Taeseung, Choi, Sang Koo, Park, Daehwan, Lee, Yea Ram, Chung, Chan Bok, Kim, Jin Woong
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Language:English
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cited_by cdi_FETCH-LOGICAL-a385t-5bedbe46e2dc71dc44cbd582c41e8d183731d0e68e5a4e52bdf885f48c8d2f3
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container_end_page 13408
container_issue 50
container_start_page 13403
container_title Langmuir
container_volume 32
creator Yang, Taeseung
Choi, Sang Koo
Park, Daehwan
Lee, Yea Ram
Chung, Chan Bok
Kim, Jin Woong
description This study introduces a new type of associative nanoparticle (ANP) that provides controlled chain-to-chain attraction with an associative polymer rheology modifier (APRM) to produce highly stable Pickering emulsions. The ANPs were synthesized by grafting hydrophobically modified hygroscopic zwitterionic poly­(2-methacryloyloxyethyl phosphorylcholine-co-stearyl methacrylate) brushes onto 20 nm sized silica NPs via surface-mediated living radical polymerization. The ANP-stabilized Pickering emulsions show significant viscosity enhancement in the presence of the APRM. This indicates that the ANPs act as particulate concentration agents at the interface owing to their hydrophobic association with the APRM in the aqueous phase, which leads to the generation of an ANP-mediated complex colloidal film. Consequently, the described ANP-reinforced Pickering emulsion system exhibits improved resistance to pH and salinity changes. This coacervation approach is advantageous because the complex colloidal layer at the interface provides the emulsion drops with a mechanically robust barrier, thus guaranteeing the improved Pickering emulsion stability against harsh environmental factors.
doi_str_mv 10.1021/acs.langmuir.6b03203
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title Particulate Coacervation of Associative Polymer Brushes-Grafted Nanoparticles To Produce Structurally Stable Pickering Emulsions
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