Self-Assembled Networks of Short and Long Chitin Nanoparticles for Oil/Water Interfacial Superstabilization

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-04-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
15
6497-6511
Series
ACS Sustainable Chemistry and Engineering, Volume 7, issue 7
Abstract
Highly charged (zeta potential ζ = +105 mV, acetate counterions) chitin nanoparticles (NCh) of three different average aspect ratios (∼5, 25, and >60) were obtained by low-energy deconstruction of partially deacetylated chitin. The nanoparticles were effective in reducing the interfacial tension and stabilized the oil/water interface via network formation (interfacial dilatational rheology data) becoming effective in stabilizing Pickering systems, depending on NCh size, composition, and formulation variables. The improved interfacial wettability and electrosteric repulsion facilitated control over the nanoparticle's surface coverage on the oil droplets, their aspect ratio and stability against coalescence during long-term storage. Emulsion superstabilization (oil fractions below 0.5) occurred by the microstructuring and thickening effect of NCh that formed networks at concentrations as low as 0.0005 wt %. The ultrasound energy used during emulsion preparation simultaneously reduced the longer nanoparticles, producing very stable, fine oil droplets (diameter ∼1 μm). Our findings indicate that NCh surpasses any reported biobased nanoparticle, including nanocelluloses, for its ability to stabilize interfaces at ultralow concentrations and represent a step-forward in efforts to fully replace surfactants in multiphase systems.
Description
| openaire: EC/H2020/788489/EU//BioELCell
Keywords
Deconstruction, Nanochitin, Pickering emulsion, Rodlike particles, Superstabilization
Other note
Citation
Bai, L, Huan, S, Xiang, W, Liu, L, Yang, Y, Nugroho, R W N, Fan, Y & Rojas, O J 2019, ' Self-Assembled Networks of Short and Long Chitin Nanoparticles for Oil/Water Interfacial Superstabilization ', ACS Sustainable Chemistry and Engineering, vol. 7, no. 7, pp. 6497-6511 . https://doi.org/10.1021/acssuschemeng.8b04023