화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.96, 219-225, April, 2021
ZnO nanoparticles-laden cellulose nanofibers-armored Pickering emulsions with improved UV protection and water resistance
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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.
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