Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 96, Issue -, Pages 219-225Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2021.01.018
Keywords
Cellulose nanofibers; ZnO nanoparticle; Pickering emulsion; UV protection; Water resistance
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2019R1A2C1086383]
- Korea Initiative for fostering University of Research and Innovation Program of the National Research Foundation (NRF) - Korean government (MSIT) [2020M3H1A1077095]
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This study introduces a novel Pickering emulsion system utilizing hydrophobically modified ZnO composite cellulose nanofibers (HCNFZnO) to enhance UV-blocking and water-resisting performance. The HCNFZnO favored the formation of a stable Pickering emulsion at the oil-water interface, showing synergistic UV-blocking performance and significant resistance to repeated water rinsing. The results highlight the potential of HCNFZnO in developing UV-blocking emulsion systems with excellent water resistance without traditional emulsifiers.
This study introduces a new type of Pickering emulsion system with enhanced UV-blocking and water-resisting performance, in which hydrophobically modified ZnO composite cellulose nanofibers (HCNFZnO) were employed to form an oil-in-water (O/W) interface. For this, we first deposited ZnO nanoparticles (NPs) on CNFs by reducing the zinc precursor and subsequently grafted hexadecyl-trimethoxysilane on the ZnO NPs. We observed that the HCNFZnO favoured the formation of a fibrillary solid layer at the O/W interface, thus producing a structurally stable Pickering emulsion. The Pickering emulsion showed synergistic UV-blocking performance when prepared with a chemical UV filter in the oil phase. Interestingly, owing to the inter-fibrillary attraction of cellulose bodies, the HCNFZnO-armored Pickering emulsion drops adhere to each other, thus exhibiting significant resistance to repeated rinsing with water. These results highlight that our HCNFZnO enables the development of a UV-blocking emulsion system with excellent water resistance without the aid of conventional emulsifiers. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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