Stable cellulose nanofibril microcapsules from Pickering emulsion templates

Hui Shi Huishi, Kazi M.Zakir Hossain, Davide Califano, Ekanem Ekanem, Ciaran Callaghan, Janet L Scott, Davide Mattia, Karen Edler

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Abstract

Electrostatic attractions are essential in any complex formation between the nanofibrils of the opposite charge for a specific application, such as microcapsule production. Here, we used cationized cellulose nanofibril (CCNF)-stabilized Pickering emulsions (PEs) as templates, and the electrostatic interactions were induced by adding oxidized cellulose nanofibrils (OCNFs) at the oil–water interface to form microcapsules (MCs). The oppositely charged cellulose nanofibrils enhanced the solidity of interfaces, allowing the encapsulation of Nile red (NR) in sunflower oil droplets. Microcapsules exhibited a low and controlled release of NR at room temperature. Furthermore, membrane emulsification was employed to scale up the preparation of microcapsules with sunflower oil (SFO) encapsulated by CCNF/OCNF complex networks.
Original languageEnglish
Pages (from-to)3370-3379
Number of pages10
JournalLangmuir
Volume38
Issue number11
Early online date9 Mar 2022
DOIs
Publication statusPublished - 22 Mar 2022

Bibliographical note

Funding Information:
The authors would like to thank the EPSRC for funding this project (Grant EP/P027490/1). The authors thank Diana Lednitzky and Philip Fletcher of the Material and Chemical Characterisation Facility (MC) at the University of Bath for helping with TEM imaging. Data supporting this work is freely accessible in the Bath research data archive system at DOI: 10.15125/BATH-01110. 2

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

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