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    Bacterial cellulose nanofibrils-armored Pickering emulsions with limited influx of metal ions

    Year: 2021

    Journal: Carbohydr. Polym., Volume 258, APR 15

    Authors: Seo, Hye Min; Seo, Minjeong; Shin, Kyounghee; Choi, Sunyoung; Kim, Jin Woong

    Organizations: National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2019R1A2C1086383]; Korea Initiative for fostering University of Research and Innovation Program of the National Research Foundation (NRF) - Korean government (MSIT) [2020M3H1A1077095]

    Keywords: Cellulose nanofibrils; Pickering emulsion; Interfacial membrane; UV-blocking

    This study introduces a hydrophobically modified bacterial cellulose nanofibrils (BCNF)-stabilized Pickering emulsion system, which can limit the influx of metal ions through the interface. We showed that the C18 alkyl chain-grafted BCNF (C18BCNF) can readily associate to generate a resilient thin membrane at the oil-water interface regardless of the type of oil, which is essential for the production of stable emulsion drops. The viscoelasticity of C18BCNF-armored Pickering emulsion was feasibly tunable by manipulating the grafting amount of the C18 alkyl chains, as well as controlling the C18BCNF concentration. We also demonstrated that the C18BCNF membrane formed at the interface effectively entrapped metal ions through electrostatic binding with the carboxyl groups on C18BCNF, thus maintaining original UV-absorbing capability of chemical UV filter-containing emulsions. We expect that the BCNF surfactant fabricated in this study has immense potential for the development of various complex emulsion products.
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