High Internal Phase Oil-in-Water Pickering Emulsions Stabilized by Chitin Nanofibrils : 3D Structuring and Solid Foam
| Autor: | Long Bai, Xiao Zhang, Jukka Ketoja, Orlando J. Rojas, Siqi Huan, Xuetong Shi, Annika Ketola, Ya Zhu |
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| Přispěvatelé: | Bio-based Colloids and Materials, Department of Bioproducts and Biosystems, VTT Technical Research Centre of Finland, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Coalescence (physics)
chitin nanofibrils material molding Materials science Captive bubble method 02 engineering and technology Pickering emulsions 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Surface energy Pickering emulsion 0104 chemical sciences Contact angle high internal phase emulsion Rheology Chemical engineering Emulsion General Materials Science Wetting 0210 nano-technology direct ink writing porous materials Research Article |
| Zdroj: | ACS Applied Materials & Interfaces Zhu, Y, Huan, S, Bai, L, Ketola, A, Shi, X, Zhang, X, Ketoja, J A & Rojas, O J 2020, ' High Internal Phase Oil-in-Water Pickering Emulsions Stabilized by Chitin Nanofibrils : 3D Structuring and Solid Foam ', ACS Applied Materials & Interfaces, vol. 12, no. 9, pp. 11240-11251 . https://doi.org/10.1021/acsami.9b23430 |
| DOI: | 10.1021/acsami.9b23430 |
| Popis: | openaire: EC/H2020/788489/EU//BioElCell Chitin nanofibrils (NCh, ∼10 nm lateral size) were produced under conditions that were less severe compared to those for other biomass-derived nanomaterials and used to formulate high internal phase Pickering emulsions (HIPPEs). Pre-emulsification followed by continuous oil feeding facilitated a "scaffold" with high elasticity, which arrested droplet mobility and coarsening, achieving edible oil-in-water emulsions with internal phase volume fraction as high as 88%. The high stabilization ability of rodlike NCh originated from the restricted coarsening, droplet breakage and coalescence upon emulsion formation. This was the result of (a) irreversible adsorption at the interface (wettability measurements by the captive bubble method) and (b) structuring in highly interconnected fibrillar networks in the continuous phase (rheology, cryo-SEM, and fluorescent microscopies). Because the surface energy of NCh can be tailored by pH (protonation of surface amino groups), emulsion formation was found to be pH-dependent.Emulsions produced at pH from 3 to 5 were most stable (at least for 3 weeks). Although at a higher pH NCh was dispersible and the three-phase contact angle indicated better interfacial wettability to the oil phase, the lower interdroplet repulsion caused coarsening at high oil loading. We further show the existence of a trade-off between NCh axial aspect and minimum NCh concentration to stabilize 88% oil-in-water HIPPEs: only 0.038 wt % (based on emulsion mass) NCh of high axial aspect was required compared to 0.064 wt % for the shorter one. The as-produced HIPPEs were easily textured by taking advantage of their elastic behavior and resilience to compositional changes. Hence, chitin-based HIPPEs were demonstrated as emulgel inks suitable for 3D printing (millimeter definition) via direct ink writing, e.g., for edible functional foods and ultralight solid foams displaying highly interconnected pores and for potential cell culturing applications. |
| Databáze: | OpenAIRE |
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